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Author Topic: 2 stroke comeback.  (Read 21791 times)

Offline Kakapo76

  • Website Member
  • Posts: 548
Re: 2 stroke comeback.
« Reply #15 on: March 11, 2020, 10:38:44 AM »
Gonna be a screamer- might need some muffling to be useable- I get in trouble with neighbors when I flush my 250 merc  *-)
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Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #16 on: March 11, 2020, 12:58:03 PM »
I'll put a pair of my little 2" transom dumpy mufflers on it.  Will still need to adjust the amount of water injected into chamber to find the "sweet spot" power wise.
It's a 90 deg v6 so has a unique sound. I like it.
Way better than the old 3.8 commy or the VQ35

* IMG_20200311_39157.jpg (137.1 kB, 1024x768 - viewed 860 times.)
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Online Jimmy Jet

  • Website Member
  • Posts: 476
Re: 2 stroke comeback.
« Reply #17 on: March 11, 2020, 13:23:27 PM »
How many hp was the base motor and what size hull you thinking of putting it in? Should go real well.
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Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #18 on: March 11, 2020, 14:04:46 PM »
Quote from: Jimmy Jet on March 11, 2020, 13:23:27 PM
How many hp was the base motor and what size hull you thinking of putting it in? Should go real well.

Base engine is rated 225hp @6000rpm.
I'll put it in a special new
JJ3.0 hull specially designed for 2 stroke, 2 stage propulsion.
Should be under 350kg and tough as (and grunty)  pop

* IMG_20200311_45567.jpg (18.78 kB, 1024x484 - viewed 861 times.)
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Offline Kakapo76

  • Website Member
  • Posts: 548
Re: 2 stroke comeback.
« Reply #19 on: March 11, 2020, 14:15:38 PM »
Love how you keep innovating Jeff- bloody brilliant. I can't see any issue with this build except the fuel bill potentially it might be horrible

Does anyone know the actual percentage of time spent at WOT in a jet boat?- all of the outboards publish a fuel burn at WOT (its often a scary number) Be curious to see if two strokes actually cost more to run in the bigger engine size- they have better throttle response, are lighter- have lots of power on tap early on?

I am curious... 350kg with 220-ish hp its going to go quite well methinks :-)
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Offline steelo

  • Website Member
  • Posts: 2356
  • Gender: Male
  • Currently boatless
Re: 2 stroke comeback.
« Reply #20 on: March 11, 2020, 15:10:15 PM »
Quote from: Jeff B on March 11, 2020, 08:42:32 AM
https://youtu.be/zkRhbpJitEI

She is a runner.
Now to build a hull to match...
What about that boat shaped bin under the table?
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His Holiness Steelo 'Wun Lung Francis' the 1st. Bless you all>

Offline Ross Goldsack - JBNZ Immediate Past President

  • Global Moderator
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  • Posts: 1468
Re: 2 stroke comeback.
« Reply #21 on: March 11, 2020, 16:32:43 PM »
Quote
specially designed for 2 stroke 

What does that involve? Smoke resistant alloy
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Ross Goldsack
JBNZ National Executive

Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #22 on: March 11, 2020, 18:42:38 PM »
I'm expecting the fuel consumption to be absolutely terrible....
Not sure on fuel burn but in past experience a 2 stroke uses about 30% more fuel no matter how you drive it.
In reality it comes down to weight you are pushing and how fast you are pushing it?
I'm expecting a good ratio of "fun per litre of fuel" on this one. ;)
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Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #23 on: March 11, 2020, 18:44:14 PM »
Quote from: Ross Goldsack - JBNZ President on March 11, 2020, 16:32:43 PM
What does that involve? Smoke resistant alloy

Special design which optimizes the power characteristics of the engine/pump combo.  :P
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Offline Paul

  • Administrator
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  • Posts: 3589
Re: 2 stroke comeback.
« Reply #24 on: March 11, 2020, 20:36:01 PM »
Quote from: Jeff B on March 11, 2020, 18:42:38 PM
I'm expecting the fuel consumption to be absolutely terrible....

The cost of 2-smoke oil will be the real killer..
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Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #25 on: March 12, 2020, 15:17:43 PM »
Speaking of fuel and oil running costs that will surely send me broke I made fuel tank. Hold enough that my ears will be ringing and I'll be sick of it before I run low on fuel.

* IMG_20200312_10344.jpg (88.49 kB, 1024x768 - viewed 809 times.)
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Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #26 on: March 12, 2020, 15:19:58 PM »
Bench seat was going to be a bit dodgy at 60mph so put buckets on heavy duty adjustable rails so can move driver seat 200mm closer to centre when solo.
And can move seats to suit driver/passenger weight.

* IMG_20200312_28494.jpg (111.24 kB, 1024x768 - viewed 791 times.)

* IMG_20200312_194.jpg (95.98 kB, 1024x768 - viewed 808 times.)
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Offline Clint640

  • Website Member
  • Posts: 100
Re: 2 stroke comeback.
« Reply #27 on: March 13, 2020, 10:50:21 AM »
Nice work! Ya need a disengage setting on the seat sliders & a good solid Jesus bar then the passenger can shift their weight on the go for better cornering like a racing sidecar swinger  )1

Cheers
Clint
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Offline lq4151

  • Website Member
  • Posts: 234
Re: 2 stroke comeback.
« Reply #28 on: May 10, 2020, 19:08:09 PM »
I have offten wondered what an engine like that would go like laided down and  coupled  To a jet . Well done Jeff
Your projects are a  inspiration to all keep it up. I'll keep a keen eye on this project 
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Offline Jeff B

  • Website Member
  • Posts: 5179
Re: 2 stroke comeback.
« Reply #29 on: May 10, 2020, 19:10:50 PM »
Not much happening lately, engine and pump all set up, ready to go.
It is a very compact setup.
I'll get back into it soon
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