nzjetboating Web Board.
nzjetboating.com Forums => Tech Library => Topic started by: belmont on January 16, 2015, 20:54:09 PM
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Hi guys
I have recently brought a 4.1 alloy boat running a carb sr20, dominator intake and Colorado single stage. 110mm nozzle and bullet impeller (18deg?)... boat goes really well with two people, but struggles to get on the plane with 4. Any advice on how to make it go better?? Do I need more hp? different unit setup?
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probably more HP. Sounds about right for blade/nozzle. Is the unit slipping? I had the same setup in my Jet 20. Fantastic for a small boat but 4 people in a 4m boat is getting up there in my experience 2c
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Should easily do it with 4 people if the engines running right. Lots of variables though. Boat weight would be a major factor what rpm is it pulling?. Got pics or vid of your setup? Good power upgrade would be to fit a factory sr20det turbo setup and get rid of carb and go back to efi
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Hi the impeller is pretty much new, so no problem there.. more hp? what engine would you recommend? and would I need to change the unit if I was going for a bigger engine?
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Its a bit of a tricky one with the single stage, generally speaking going turbo or to a v6, the unit will struggle trying to deliver the power without slipping. Others on here will know what works. Going to a modern blade has big gains from what i have experienced over the standard bronze blades.
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rogee
it pulls about 4500-5000, I have been told the boat would be about 400KG.. its a Rakaia 410 hull. I have been told turbos can be expensive to get set up? I will post some photos over the weekend cheers
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They are a light enough hull. Somethings cocked up and it should go fine with 4 people if the setup is right. No big deal to do a turbo upgrade but it does add up . Still a better option than a motor swap though unless you dont like turbos .
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With an 18 scott or whatever bullet and 110 noz you should be at5500 rpm . Your way off the mark so id be checking what imp you actually have then look at the engine for lack of power issues. 2c
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Would the hp be down because it is carbed?
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Maybe but a carb will make as much or more hp than efi if done right. That said theres alot of half arsed carb conversions out there primarily because whoever did them was trying to save $$$ not make power....
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is it just a standard 100 hp blade ? you need to smack it up a bit finer .
a decent 3 blade will put up with a early subaru turbo engine so it would put up with a sr20de + t aswell
you can + a sr20 really easily . all the oem stuff bolts on and the market is flooded with it .
hardest part is ecu and someone to tune it
what carb is on it and what does it look like ?
or is it all oem carb stuff from an old primera motor etc ? they are pretty gutless
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Hi this is my carb set up. Think it's off a 3l ford Essex
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how would a 3l Nissan vg30de go in my boat? there is one on trade me ready to go..
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how would a 3l Nissan vg30de go in my boat? there is one on trade me ready to go..
I saw one in a 3.5 m boat the other day, it was insane *-)
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was that a vG30 or a vQ30 .
the vg30e ( single cam , which that one on TM is ) is a bit of and old dog and prolly not much better than a essex v6 and below a comme v6
that carb setup if a joke . like a lawnmower intake has more potential
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was that a vG30 or a vQ30 .
the vg30e ( single cam , which that one on TM is ) is a bit of and old dog and prolly not much better than a essex v6 and below a comme v6
that carb setup if a joke . like a lawnmower intake has more potential
umm not sure didn't ask, but in that tiny 3.5 boat it was , more than enough. The hole shot was impressive practically leapt out of the water B))T
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how much better would my sr20 go if I was to get rid of the carb and inject it?
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was that a vG30 or a vQ30 .
the vg30e ( single cam , which that one on TM is ) is a bit of and old dog and prolly not much better than a essex v6 and below a comme v6
that carb setup if a joke . like a lawnmower intake has more potential
The vg30 engines go really well, not even that heavy either, done a few and they are much better performers than the ford v6, for a budget concious build they can be a very good option if you find a low K tidy one , would be well worth considering the TM one as its all there and ready to go for less than the price of a new link atom ecu alone?
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Have always run a 16 deg 3 bladed scott impeller and a 115 to 118 nozzle on a SR20. That carb is a a joke. Get one off a 2L toyota or similar. Given the carb is dodgey what does the distributor look like and what timing are you running.
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If I was to go for the vg30de engine setup, would it be too much for my unit to handle? Would I need to go to a two stage?
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No. With the blade and noz you have itl be pretty close already.
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If I was to go for the vg30de engine setup, would it be too much for my unit to handle? Would I need to go to a two stage?
VN V6 commadore would be a better option.
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+ 1 for the commodore , but budget on a 2 stage pump aswell.
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Hi guys
Had the boat out tonight. Normally it goes pretty good. But tonight it ran rough. Only got to 4000rpm and sounded rough. A small amount of smoke was coming out of the pipe at the back of the block (see photo) what is the pipe for? And should it be smoking?
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That looks like a breather for your rocker cover. usually they are plumbed via a catch can back into the vacuum side
of your intake where it sucks any oil vapour etc and re burns it in the cylinders. Has it always been open and only just started smoking?
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Always been open like that. And just started smoking
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oil pressure, level, temperature all normal?
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Yeah the temp and oil pressure stayed normal. It has been using a bit of oil. I was only out for maybe ten minutes run time tonight. I will check oil levels tomorrow. Cheers
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That fitting should would normally be plumbed to the air filter, pcv valve on lower right should go to inlet manifold, we normally just put a small breather filter on the rear fitting ,was it smoke or condensation/steam? if waters got down that open fitting it there will be steam for ages 2c
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Hi guys I did a compression test today. 1 cylinder was at 105 and another was at 120.... Pretty sure it's time for a new motor... Anyone got anything suitable for sale? thinking the 3.8 v6 and a 2 stage unit.
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. thats only just over 10% variance . the tolerance on a sr20 is 1 atmosphere
was that engine hot or cold ? and was that with the throttle wide open ?
of course smoke comes out the breather hole . half it was prolly steam and other contaminants burning off . or just oil mist from it getting whipped and pumped around
im surprised that carb can spin a jet unit to 4k to be honest
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Engine was cold. 1 and 4 cylinder was at 150. 2nd was 125 3rd was 105. I did not know to open the throttle?
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That's a massive difference between cylinders. She's shot. There's been a few cheap tidy marinised engines on trade me lately. A good vh on there at the moment all ready to go.
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Hi garth44
I have got another sr20 gong inn the boat this week this time running injected. Easy fast way to get back on the water. I a keen to put a v6 in it over winter. Can you send me the trade me link for the vh?
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http://www.trademe.co.nz/motors/car-parts-accessories/nissan/engines/auction-845509185.htm
could this be it???