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nzjetboating.com Forums => Projects => Topic started by: AKLiving on November 11, 2016, 12:41:28 PM

Title: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 11, 2016, 12:41:28 PM
The project:

SeaArk OB jet conversion to inboard jet. I have been slowly working on my boat for a year or so now with the next step to start converting to an IB.

The boat is a 2272 MV SeaArk with a 115/80hp outboard jet. This is way under powered which has been fine for the most part. Fuel economy has been OK when light at 2.7mpg and worse than some V8s at 1.9mpg when loaded (no where close to max load capacity). Current running wt of about 1,600lbs. 

So.... I'm embarking on an estimated 2-3 year conversion depending on time and funds and time to complete it. Right now I'm done working on it until spring break up.

Work done so far:

First was adding some semi-dry bow storage that would keep stuff out of the way and provide a huge hunting/fishing platform. The frame is riveted angle aluminum and some left over 3/4" marine plywood.
Over the aluminum flooring and bow I added some exercise foam mat you can pick up at any store. It's inexpensive, light, soft, has good grip, doesn't seem to absorb water, and made the boat a lot quieter.
Next was changing from center rear console to a full walk through windshield at about 8' from the bow. Enough room to carry an ATV if needed.
Originally I was going to paint it the same SeaArk green but after using an aluminum etching primer it was a close enough match. New paint wouldn't have matched the faded green anyway. Prepped with vinegar after washing and the primer has held up to quite a bit of wear and tear.
The windows I cut from acrylic and installed myself. I may have saved $400 but it was such a pain to install that I don't want to do that again. The windows were probably 1/16" or so too big.


Parts for the conversion I have right now
It's not an exhaustive list since there are other posts for that.

Donor LE5 from 2007 Pontiac G6, ~56,000mi
M62 Supercharger
LSJ throttle body
Supercharger pulleys/tensioner
Fuel pump - Hayg
Scott 752 jet, 19-19 impellers, 110 and 114 inserts, hydraulic trim, hydraulic revers
Heat Exchanger - 3/4" in 1-1/2" copper pipe (aka 20mm in 40mm)

What I have to still get:
Base tune for 2.4l Supercharged
Wire harness - stand alone from CBM, AFI, or dyi
Driveline - Spicer 1310 or 1350 close couple, middle slip
Wideband - AEM 30-3033
Fuel Regulator
Marine exhaust - jetboatbase.com
Fuel Injectors - Bosch 42# split cone spray

I will need some help tuning and plan on getting HPT and learning how to use it.

So, here are some photos documenting the original setup to where I am right now in the build:
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 11, 2016, 12:42:48 PM
The Deck and Windshield
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 11, 2016, 12:44:09 PM
Flooring and how it looks now
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 11, 2016, 12:47:11 PM
What is going in.

The jet is a stock photo (obviously) with mine on the way. It will have hydraulic revers and trim.

Pictures of the donor car and prepping the motor. When I get the supercharger on I'll post more pictures.

I was thinking of painting the engine the same boat green, leaving it natural aluminum or the Scott jet blue. I'm open to suggestions.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: mof on November 11, 2016, 16:46:05 PM
Great project.

First thought, you will need to fit a nice long smooth delta bottom to the hull to ensure smooth clear solid water is delivered to the jet. The centre strake/fold in particular may aerate the water to the jet and hamper performance. Hamilton publish details of hull design to get best performance. Your scott unit will thank you for getting this part right, and this is hard to fix if you get it wrong.

Second, have a search for underfloor heat exchanger. 20mm copper pipe inside 40mm copper pipe. 1 metre per 100hp is the rule of thumb. Easiest and cheapest heat exchanger you can get, virtually un-blockable.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 11, 2016, 20:17:09 PM
Great project.

First thought, you will need to fit a nice long smooth delta bottom to the hull to ensure smooth clear solid water is delivered to the jet. The centre strake/fold in particular may aerate the water to the jet and hamper performance. Hamilton publish details of hull design to get best performance. Your scott unit will thank you for getting this part right, and this is hard to fix if you get it wrong.

Second, have a search for underfloor heat exchanger. 20mm copper pipe inside 40mm copper pipe. 1 metre per 100hp is the rule of thumb. Easiest and cheapest heat exchanger you can get, virtually un-blockable.

Thank you the the advice. I won't be doing the aluminum work on the hull. I will trust the work to a guy that's done this many times before and has experience on good delta dimensions. I believe he takes out the center ridge a ways further up as well. I understand the importance of getting that right and it's too hard to adjust once it's done so I'm hands off on that one.

I have seen the under floor heat exchanger and will keep that in mind. I definitely like the idea of it being difficult to block up. I run mostly glacial fed, extremely silty water and not even filters or sand traps cans get all the silt out.
Do you have any reason I shouldn't go with a plate style exchanger?
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: mohawk on November 11, 2016, 20:26:12 PM
under floor tube is just so simple and works so well. they take up no space in the engine bay and if you cant weld, you can still buy the bits from a plumbing shop , cut and fit it  then get your local plumber to braze it together .
itsa no brainer realy.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: daveb on November 12, 2016, 07:27:50 AM
The hull looks too flat(not much deadrise) for a jet pump from what I see.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Paul on November 12, 2016, 09:34:14 AM
The hull looks too flat(not much deadrise) for a jet pump from what I see.
The pump will still work but handling will be poor.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 12, 2016, 13:51:35 PM
There are lots of very shallow deadrise boats around here and they work but like Paul said they handle poorly. Poorly I guess depending on how you look at it. I definitely can't carve through a corner. I have learned how to handle my boat and approach it similar to car drifting. I slide in corners and throttle out of them. It slides so much now that I don't expect it could get much worse. Clearly it isn't any fun in rough water but I don't have any whitewater around here.


Most of my boating is in water like this:
The only way to tell which image is water is by the bow in the picture.





Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: LBD on November 13, 2016, 12:43:08 PM
http://www.nzjetboating.com/yabbse/index.php?topic=29895.15

It will be interesting to see how much this slides... 6 degree dead rise so pretty flat.. but no strakes at least not just now.

I am hoping the slight tunnel at the front will help arrest some of the front drift.... maybe.

But then, performance handling is not the aim.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: LBD on November 13, 2016, 22:48:01 PM
Have you any idea of the weight of the boat... with or with motor?
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 14, 2016, 06:55:28 AM
Have you any idea of the weight of the boat... with or with motor?

I haven't weighed it but estimated running weight with the outboard is 1,600lbs. I don't think I would be too far off on that considering how much I was hauling on my last trip and still got on step with 80hp at the pump. I plan on getting a weight before I put the new engine in.
The Ecotec weighs almost the same as the Yamaha 2 stroke I have on it now. So, I'll gain the weight of the pump and doghouse. I'm taking out the rear benched so overall I should gain less than 100lbs. I'm not too worried if I gain more though. The power gain will be around 200hp and a much better pump.
Believe it or not with the change I will be gaining considerable floor space because of removing the rear benches. See the shallow draft picture to see what's coming out in the back. I'll get a better photo when they come out.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on November 25, 2016, 11:10:24 AM
Look what arrived today.
I love winter but waiting until spring breakup is going to be painful.


Thank you Tyler Myers at Outlaw Eagle for getting me set up with an awesome pump.


At least I can pass time this winter while still being on the lakes and rivers.   --<

Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on February 22, 2017, 17:41:17 PM
The days are getting longer an I'm getting restless. Wanting to do something for the boat I figured I could mock up the heat exchanger. Using the 20mm in 40mm method here is what I have before soldering. Being in the US I used 3/4" in 1-1/2" copper pipe. It's 10' so using the 1m per 100hp I should be good for 300hp. I don't have a drill press or confidence in drilling 3/4" hole in elbows like others have so I used reducers. Local supply is limited living in Alaska but the shop had two 1-1/2" x 3/4" x 1-1/2" tees. Well they had 3 but I needed 4 so decided to keep it uniform and the other 2 ends have 1-1/2" tees with 1-1/2" to 3/4" reducers.
Total was $155 - not bad.


I'm so thankful my wife didn't even give me a hard time for doing this in the living room. She must know how anxious I am to get back to working on the boat project.

Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: garth44 on February 22, 2017, 19:11:37 PM
Mate that heat exchanger looks great. Those reducers are the way to go. Be easy to silfos/braize. Well done keep the posts coming
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: steelo on February 22, 2017, 20:30:38 PM
I've never seen one of those exchangers made in the "flesh" before but I'd say. "Nice job"
Can't wait to see the boat finished. Good luck with your build
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Matthewf/Norbert/TuiDog on February 22, 2017, 21:13:22 PM
Are the elbows you used 3/4"?
If 1/2" they will likey block up

You could use 3/4" hose tails then just loop some hose to join,  that way you don't have tight bend to trap sand stones and it's serviceable
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: mohawk on February 22, 2017, 21:14:35 PM
 I wish i had thought of using reducers .. it looks trick , nice job  b>
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on February 23, 2017, 04:05:51 AM
Are the elbows you used 3/4"?
If 1/2" they will likey block up

You could use 3/4" hose tails then just loop some hose to join,  that way you don't have tight bend to trap sand stones and it's serviceable

They are 3/4". The angle of the photo may make them look smaller. I considered using flexible hose to connect the two and it would be easy to remove the elbows should I decide to change it. I'll connect a tee valve for clean water flushing after each trip.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: mohawk on February 23, 2017, 13:50:01 PM
I wouldnt.... they give very little if any trouble... t valve is more likely too be turned of or on and forgotten....pull the hose at the sand trap and stuff a hose in there if you ever want too flush anything  2c
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Paul on February 23, 2017, 16:05:13 PM
Checking the various valves are open/closed is(/should be,) part of your 'pre-flight' you do before you leave the trailer....

I have a few valves in the coolant lines for very good reasons.  E.g. valves where the jet unit takeoffs come inside the boat (- these are essentially 'skin fittings' to help avoid sinkings).  Another valve isolating the hose-flushing quick-connect fitting.  I reckon having to remove hose clamps/hoses to flush stuff out is daft, when you can just use the correct fitting/connectors?
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: mohawk on February 23, 2017, 16:24:38 PM
My car has no valves or taps and never seems too mind , but landcruisers arent like range rovers i guess... ive also seen your boat paul , id call it a classic case of OCD but then im a simple person that doesnt like too complicate stuff  and i prefer too leave un needed junk at home ii
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Paul on February 23, 2017, 17:08:54 PM
My car has no valves or taps and never seems too mind , but landcruisers arent like range rovers
My car also has no taps, you must be getting confused!  :)

ive also seen your boat paul , id call it a classic case of OCD but then im a simple person that doesnt like too complicate stuff  and i prefer too leave un needed junk at home ii
When I got my boat it was a total POS, that barely ran.  It was continuously letting me down, and often the only reason I got back to the boat ramp was due to other friends helping me out.

I vowed to replace anything that caused problems and it ended up the way it is, as a really reliable boat.  If you're sea/estuary boating, you need a whole different setup, to a boat that you can 'beach' in the shallows at basically any time to work on stuff - you just need super-reliable and to have backup systems.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: mohawk on February 23, 2017, 18:06:04 PM
Im not knocking yr boat paul ( rovers another story ) .... my filosacantspellit is too delete stuff rather than add or replace  b>   or make one item do as many jobs as possible too save weight.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on February 23, 2017, 18:38:20 PM
I have seen the super fine silt from these rivers sit and settle out and become like concrete. So, I'll continue to obsessively rinse after every trip. To me turning valves to flush then turning them back when done isn't any harder than remembering to reconnect a hose I pulled off for the same purpose. Adding a quick way to get a job done just makes sense to me. When I play in the lake I don't worry about flushing as much but I'm on the river more.

I do have a routine pre-launch checklist but will admit I forgot a drain plug once.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: steelo on February 24, 2017, 19:00:10 PM
You could use some 12 volt electrically powered irrigation solenoids operated from the dash. Some sort of push and hold setup. That way never left open.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on May 05, 2017, 08:31:43 AM
With the warmer weather I've been able to get some work done on the motor.
Parts came in from Jet Boat Base in NZ. The parts and shipping were $$ ouch. But, the quality is great and they are the ONLY solution for the ecotec LE5 engine. The money was well worth it.

(http://cimg3.ibsrv.net/gimg/www.cobaltss.net-vbulletin/2000x2000/80-img_4538_3c696a4b78092cb61d913d29d7a142d3f0a68bc1.jpg)


Wiring harness from Steve Humphries. Thanks so much Steve, the harness is a piece of art.

(http://cimg5.ibsrv.net/gimg/www.cobaltss.net-vbulletin/640x480/80-img_4395_0eb9d89552d39466ff58e9b31d208784c783880b.jpg)


Making my own dual pass endplate.

(http://cimg8.ibsrv.net/gimg/www.cobaltss.net-vbulletin/640x480/80-img_4398_4a410f7b71148a81a3b1023cc6f9a23f72e265b7.jpg)


Waterproof relay pack for the hydraulic reverse. Used a Pelican case to house it. I think it was the 1020 but could have been 1040 micro case.

(http://cimg9.ibsrv.net/gimg/www.cobaltss.net-vbulletin/640x480/80-img_4416_c303e94c398204f0e140c8e9687d1202f6ccf9bb.jpg)


HP Tuner that doesn't look intimidating until you see what it can do and how much you could mess up your engine. I'm still trying to get help with a base tune to start from.

(http://cimg3.ibsrv.net/gimg/www.cobaltss.net-vbulletin/2000x2000/80-img_4477_9e5097ae463bbc7faa4b66c54a1ac3259f822dda.jpg)


And........

(http://cimg7.ibsrv.net/gimg/www.cobaltss.net-vbulletin/1024x768/80-img_4547_deb010d7f6e14a5f9004d0ac064c06c7a17f6898.jpg)

(http://cimg8.ibsrv.net/gimg/www.cobaltss.net-vbulletin/1024x965/80-img_4549_f6973edf5149a6a36c88bb38dd82a503bef8395b.jpg)

(http://cimg9.ibsrv.net/gimg/www.cobaltss.net-vbulletin/1024x998/80-img_4548_828153018aada75539eea470eb082725ee346740.jpg)

(http://cimg2.ibsrv.net/gimg/www.cobaltss.net-vbulletin/1024x912/80-img_4550_1d4d88a3258861db7e670688596a4c8d5c6b9dab.jpg)


Almost there. Just a few minor things left to connect. I can't wait to hear this thing roar for the first time having no muffler. Thankfully my neighbors aren't too close.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Paul on May 05, 2017, 10:08:56 AM
I've gone through and fixed all the image links, so they'll display properly.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: swifty on May 05, 2017, 18:28:47 PM
Nice work on the photos Paul.
  I love these motors,they are Pricey in nz as we cant get used motors locally.They can produce 300hp without stressing them to much and they have a slight super charger whine which sounds good.  fl. ch>v
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Maxxi on May 09, 2017, 07:14:51 AM
FWIW  I have a 2.4 ecotec  750 scott.  The boat is on this forum  JBM(Dick)   March 2011.   The boat was a night mare and took me three years to make it run properly.   I should have built it myself as I have had to gut the boat and rebuild ALL basic installs from gas tank mounts to seat mounts to foam in floor, pump issues and ENDLESS engine issues.  I dont even want to talk about it.   

That said I have a few questions and comments.

First...  the jet you will love.   Even though Dumb A. installed the pump so as it leaked bad at the transom and a little on the intake the pump itself has been fantastic.  ONly wish I had the 752.

Although it took  three wiring harnesses not one of which was built properly to get one that actually worked  once I did the motor rocks.   About 200 hp.  (one 19 pitch rpm 6000 arguably i need a new impeller now that I have the engine making power.) The harness is from CBM  but I tell you right now they are NOT BUILDING  them like they say they are.   Second mine was NOT BENCH TESTED.  It simply did not work when it showed up and it took days again to trouble shoot the harness.   Four wires were wrong and had it been bench tested it would be obvious instantly.


I did a lot of reading and calling re computers and I do not understand how you are going to program that computer to fit your motor.    In fact it was my understanding that the mefi 5  or any computer that looks like the one you have is not changeable with out the proprietary software.   maybe this has changed...? 
I thought the whole idea of buying a harness and computer was that the programming would be done already?   Other wise you are just buying some wires.

I am just talkin here.   There is no right way.

A day late and 100 bucks short I sure would have suggested you go with the 752 / 2.4 NON super charged.     
With the charger you must run premium and engine temps under hood temps are high.     To be honest I have never heard of or seen a 2.4  supered....  2.2 yes...  not 2.4.      In my opinion the extra power is almost not usable because you can not sustain the load  for the heat that is generated.   For something like a sprint boat or anything where you can limit duty cycle what you have made would be outstanding.     You may not realize that once you go over 4000 rpm with that motor your fuel consumption is going through the roof.   It will sure be fast but I do not know how practical.


Perhaps this is all just fun for you and problem solving all this is what you seek.?



Im not sure how you are going to reduce the boost but I guess you have thought of that.  (pulley size but what size)  The base motor will have too high of compression to boost until you get up to at least 3000 rpm.  Thats a guess.
That super charger is also noisy as hell.  No really it is.   I have talked to two guys that owned 2.2 supers and at first.... lots of fun... two hours up the river....  holy crap does this thing burn fuel and it is sure  loud...   " I SAID...  WHAT"  i CANT HEAR YOU.

At the very least you have a perfect motor and pump combo.  I mean perfect.   If you decide for what ever reason you can pull charger off and go back to NA.  You will need new impellers and a different computer program  but thats not too big of deal given how far into the boat you are going to be.

Oh and one last question as my exhaust  manifolds have design flaws and I might have to order a new one what did that manifold and riser cost.
mine is made here in North America but then  was discontinued as there is no market because Marine engine department in Louisiana stopped making  2.4 marinised motors.    The casting is really crap not to mention mine leaks at the riser.     I am sure I can grind these one and use different hardware to make them work better but depending on cost .....

well cheers.   

 
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on May 09, 2017, 16:53:58 PM
FWIW  I have a 2.4 ecotec  750 scott.  The boat is on this forum  JBM(Dick)   March 2011.   The boat was a night mare and took me three years to make it run properly.   I should have built it myself as I have had to gut the boat and rebuild ALL basic installs from gas tank mounts to seat mounts to foam in floor, pump issues and ENDLESS engine issues.  I dont even want to talk about it.   

That said I have a few questions and comments.

First...  the jet you will love.   Even though Dumb A. installed the pump so as it leaked bad at the transom and a little on the intake the pump itself has been fantastic.  ONly wish I had the 752.
...


I'm sorry you had such trouble.


While I won't know if there are any problems with my harness until I'm ready to tune it was reassuring that Steve called me the other day just to see how it was going. I'm sure he can make mistakes but it's good to know he cares about what he sells. I don't remember the last time I got a call from a business like that.


As for the 2.4 LE5 supercharged - there are a lot of them out there. Most still in cars and many in rock buggies or similar. The 2006-2007 is stronger than the L61 (2.2l) having some forged internals.


My ECM is not from a company. It was in the car with my motor. With HPTuners the E67 that is original to my motor can be tuned to do what I want. HPTuners can adjust just about anything with my ECM. I heard some ECMs purchased from companies requiring proprietary software could be difficulty to use and tune. The biggest hurdle is to get a base tune. There are some guys working this week on the same setup I have (except for a land vehicle with wheels) and tuning to SD like I need. I'll know in a week or so if they can help me out. If not, I think I have created a base tune that might get me started. It is truly amazing what you can do with HPTuners. Almost too much, that's what scares me since I'm not a tuner.


I haven't heard much heat problems from the guys I've talked to that have these ecotecs. I have heard heat soak after shutdown can cause some decreased in performance. I have already been considering ideas for cold air intake. I'm building my own doghouse so only limited by time and imagination. I built my heat exchanger for 300hp and can easily add more for very little cost. I may add a circulation pump with a timer, like a turbo timer, if I need to to continue cold water circulation after shutdown if I really need to. I'll definitely do a hard, long run to see how temps hold before I take it out to a remote location.


I don't plan on reducing boost. If anything I would go with a smaller pulley. The street guys are going down to 2.7" without difficulty and spin theirs to 7,000rpm. This would help with boost at lower RPMs and this motor has been proven to handle it.  I'm sure fuel economy won't be better than an NA engine but I doubt it will be as bad as my 2stroke. I've always run premium (another setting that can be modified while tuning) and now I won't have the added expense of $20-30 in oil per trip.


Noise? Yep, I'm sure. I wore earmuffs with my 2-stroke. Again, I have ideas on how to mitigate this as well. If I find something that works I'll post what I learn.


Manifold- It appears to be very well made. Nice powder coating though I would have been fine with bare aluminum. I'll let you know how it goes after I get to finally get out on the water. I haven't heard anything bad about them. It was from a sponsor on this forum, Jet Boat Base. Just send them a message. They will send you a price list. It helps that the US $ is much stronger than NZ right now. Shipping is a killer though.


Hopefully that answered all your questions.


2 last thoughts:

Yes, I love to trouble shoot and try something new. It's how I learn best. Sometimes costly, mostly costing time. Something I was troubleshooting/improving today will be in the attached pics. I didn't like the belt-pulley setup on the LSJ supercharger conversion. I tried gutting the A/C because you need that pulley for proper belt routing. It would work great but I went with a pre-fab engine mount and it won't fit with this mount. I love the mount but when you see how they route their belt it just barely touches the alternator. So I came up with my own pulley mount. I think the engine mount should come configured this way already. Maybe Jet Boat Base reads this and makes some changes. Again, not a complaint about them. The engine mounts are great and the fit and finish is incredible.


If all else fails I still have all the NA parts and it wouldn't take much to use the stock tune and modify it for stand alone. If I blow up the motor there are 2 more in town with moderate miles on them for $800. A new motor goes for $3k. There is no way you can find marine motors for close to that. I just sold my 17 y/o outboard for $4,300. Once running parts are a dime a dozen. New impellers will be more than my engine.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Matthewf/Norbert/TuiDog on May 09, 2017, 19:41:24 PM
AKliving - not even finished your project and talking about a smaller S/C pulley -  that's what we like to hear!  b>  B))T
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on May 10, 2017, 03:04:25 AM
 Advice/opinions wanted.
Does anyone know the minimum draft for a Scott jet? I'm only drafting  just 4-6" (10-15cm) when loaded light. I can shift some weight to the back but not much. I'm gaining very little to no weight in my conversion.
I'm considering going with a tunnel design (about 2") similar to many production boats designed for super shallow river running. My fabricator has successfully built them for various combinations but much deeper drafting. Scott Jet gave me a canned response to the question without answering it.
I don't see anyone where you guys are using tunnel designs and still run super shallow rocky rivers. Though this isn't really a debate between best designs.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Maxxi on May 10, 2017, 05:36:30 AM
Good day sir:
It does sound like you are well aware of what you are getting into so thats the biggest thing.

Oh and FWIW  I admit entirely  Cris at CBM (custom built motors) was great to deal with.   Although plenty of the things he told me were Poo like they are making the harnesses and that they bench test them.     Told me on a Monday they had the harness but oddly it took nine days to ship????  just long enough to order one from the other guy  and again.  Useless harness as four wires were simply in the wrong pin location.   The wiring diagram HE PROMISED  would be with the harness was a few lines on a blank page.   I recall telling him  he promised a MAP of  the State and he sent directions to his house.   That is clearly an analogy.   I must have been on the phone with that guy 20 times over just the harness and computers.   Always polite and said he would   "..... ....  ...  "  and push come to pushharder  he just didnt. 

Thats my experience perhaps other people have other luck.


RE  min draft for your scott.... hmmm  can not answer in inches but like i said I have the 750 Scott in a boat about 1500lb 16 feet long 5 foot wide.   I will admit with only two people and 1/4 a tank of gas I have to walk to the back of the boat to prime the pump;

Once full of water it never looses it.

Full tank of gas  the same guy and fishing gear and its not an issue.
I will also state my boat is set up to run shallow thus flat and as such has almost looks nose low when light and sitting flat in the water.  Gas tank is in under wind screen.

About your tunnel.... perhaps you could just put UHMW on the bottom and that would give you 1/2 inch tunnel so to speak.    Maybe a center strip kit?

Not sure how much you have run a Scott but I swear to god you can cover 1/2 of the intake and still get on step with only a little cavitation.    I have put it on the trailer several times and was stunned to see so many rocks in the intake as I had not noticed any issue while driving.
I have hit several gravel bars and FILLED THE PUMP  with pea gravel to the point the nozzle out back is 1/3-1/2  full of rocks... like it was pumping them....  push and pull and shuv until it was a float again and jump up and down on it to pump the rocks out of the pump with water and off you go again.   
No stomp grate.....  although I paid for one and the boat came with one it is one more thing JBM could not do right.   The pump cavitated like hell with it in.  After talking with Conrad Scott about it  I just took it out.  Never looked back.   I think the key is you will never put so many rocks into the intake you loose the ability to steer and so long as you can do that stick it on a bar and take the rocks out of the grate with a flat screw driver from underneath.   Just pry  left and right once between each bar and the rocks fall out.   I say again....  I have never had to do this on the river.  Just did not need to.

OMG the sun just came out   OoOoO
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on May 10, 2017, 08:20:03 AM
Thanks Maxxi. Real world experience appreciated. I've heard from many that have similar experiences with running fine having the grate full of rocks. I am very fortunate to have come across this pump. I paid for a used Ford Pinto and received a brand new Rolls-Royce.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on June 05, 2017, 05:44:44 AM

Getting much closer to realization.
It goes to the hospital in less than 2 weeks for the surgeon to perform the transplant. As many hours as I have spent getting it to this point so far I am sure glad (and my wife too) to take it to a shop to do the aluminum work.


Here is the progress so far. My pipe soldering skills need honing but the heat exchanger works great. I wasn't even flowing as much water as the jet pump would and the copper pip at the outflow was only warm to touch.


The engine needs to be tuned still so hopefully that will get done before it's taken to the shop. It sure is easy to work on while out of the boat.
https://drive.google.com/open?id=0B-htR6Muu1BZTkhQRTZlSjZPSDg (https://drive.google.com/open?id=0B-htR6Muu1BZTkhQRTZlSjZPSDg)

I can't believe I found parts for $89 shipped to my door. They appear to be genuine spicer parts. Even if they were junk at that price I could have a spare on hand.
https://drive.google.com/open?id=0B-htR6Muu1BZOTRNTGdnaUVENTA (https://drive.google.com/open?id=0B-htR6Muu1BZOTRNTGdnaUVENTA)
https://drive.google.com/open?id=0B-htR6Muu1BZaE16NHBndlZoZ2c (https://drive.google.com/open?id=0B-htR6Muu1BZaE16NHBndlZoZ2c)
https://drive.google.com/open?id=0B-htR6Muu1BZVktfdE85Wk5zWTA (https://drive.google.com/open?id=0B-htR6Muu1BZVktfdE85Wk5zWTA)
https://youtu.be/e16GM-ZOQXE (https://youtu.be/e16GM-ZOQXE)

Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on June 05, 2017, 05:49:05 AM
I can't seem to upload jpg images no matter how small I make them. I get error file size >250kb even if they are less than 100kb so hopefully the google drive links work.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: JohnR on June 05, 2017, 08:07:47 AM
Turn water on after you start engine. And turn it off before you shut engine off. Probaly wont matter with the high riser setup you have but it pays to be safe
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Paul on June 05, 2017, 16:21:21 PM
I can't seem to upload jpg images no matter how small I make them. I get error file size >250kb even if they are less than 100kb so hopefully the google drive links work.

That the total file size across all the attachments in the post.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on August 06, 2017, 17:27:35 PM


I will try to post more of my build when I can. I seem to struggle with trying to make my photos fit the file size limit and I don't have a server I put them on.
First outing with the family after the conversion. We went to Harding Lake, Alaska. A Beautiful day!!!
[/size] B))T

Supercharged a 2007 2.4l LE5 GM engine from salvage yard. Converted my SeaArk 2272 MV from outboard to inboard. Scott 752 with 19/19 impellers, 111 trim nozzle. (love that trim for leveling out and getting rid of porpoising)Made 39.5mph (reproducible on GPS) at 4,700 rpm. Not bad for a tune that isn't finished yet and a rough guestimate on pump setup. I did a load test the other day when I was still only pushing it to 3,200rpm. I was going about 24mph at that speed. Then put 1,800lbs of water barrels onboard and got on plane like it was nothing toping out at 22mph. My draft was still only 10" with that load and I wasn't evenly distributed (could have used more towards the bow).


Man that supercharger whines when going over 3,500rpm.


https://youtu.be/yLcozQbBV5o (https://youtu.be/yLcozQbBV5o)
[/color]
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on August 26, 2017, 18:38:37 PM
There's still a little work left to do on the boat, engine tuning and pump tuning.
Moose hunting is in a few weeks and I'm running well enough with way more capability than last year so I'm happy.


Maybe this winter I'll have some time to finish posting the build but for now I'm done.


Thank you all for not only the forum help but providing a wealth of information to be freely shared. There is no way I possibly could have completed this project without help from people like you.


Here is my final trials for the year. Sorry for the poor quality.


https://youtu.be/_Xd0bQ84MaY


(https://youtu.be/_Xd0bQ84MaY)
(https://youtu.be/_Xd0bQ84MaY)
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: Scott Waterjet on August 28, 2017, 09:55:09 AM
Great to see you have your new combo in action. Well done. Enjoy the pump!!
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on October 05, 2017, 11:36:52 AM
This turned out to perform better than expected. I still have tuning issues but the engine and pump combo didn't break a sweat. Trying to stay in the channel down river that had a huge log in the middle making each side barely over the width of my boat I finally got majorly stuck. The great part is that I went about 50+ yards in 2" or less of water. This was with about 2,500 lbs of moose, men and gear onboard. I doubt I would have had any problems if I were running with usual weight.
When we got home I found out we collected almost 1/2 the grate worth of debris and didn't notice a change in performance!
God blessed is with a beautiful moose providing over 600lbs boned out meat, duck, goose, and a white wolf.
Next summer I'll finish painting, sealing, and tuning. I'm done for the season since I don't have a garage and freezing temps have already come.
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: AKLiving on October 05, 2017, 11:39:53 AM
Running shallow fully loaded before the sand just wasn't wet enough. 
And why I want to reach areas others can't.
All I can say is that Scott pump is simply awesome!
Title: Re: MV 2272, S/C Ecotec 2.4L, Scott 752
Post by: steelo on October 05, 2017, 12:54:05 PM
Hi AKL. Love the pics of the boat etc. "I feel" the moose and especially the wolf kill pics are gratuitous and unnecessary.
Anyway good luck with your boating. Regards Steelo