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Sponsors Forums => Scott Waterjet => Topic started by: Scott Waterjet on September 14, 2019, 15:34:04 PM

Title: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Scott Waterjet on September 14, 2019, 15:34:04 PM
We are keen to get some feedback from you all about the engines that you would like to be able to match to our 612 waterjet.

We would be grateful if you could let us know what engine\model you would like to be able to use with the 612, and the challenges that you might face currently with that engine/612 combination.

Looking forward to hearing back from you all.
Title: Toyota's
Post by: Scott Waterjet on September 17, 2019, 15:49:04 PM
Let's hear what is a good value Toyota for a mini boat
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Ross Goldsack - JBNZ President on September 17, 2019, 18:16:50 PM
How do you think the Honda k24 would go?around 190 - 200hp @ 6800 - 7000rpm
Title: Honda K24 6800 - 7000 rpm
Post by: Scott Waterjet on September 17, 2019, 18:42:16 PM
Hi Ross, Why the desire to do 6800 - 7000 rpm ? Interested to understand where you are coming from.
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: lachlan on September 17, 2019, 19:53:55 PM
The k24 gutless version makes peak power 200 hp at 6800 . Could be a cheal light motor
The black sticker motors dont have real v tec . Only cam phasing  .
The red sticker motors have cam phasing and vtec . Make 10 % more hp with about the same ammount more revs

Are you implying we should rev it more or less than 7k ?  Isnt the whole point in the smaller unit to rev it harder than most automotive engines ?
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Scott Waterjet on September 17, 2019, 20:15:52 PM
No suggestion either way. Just looking to understand where everyone is coming from. Look forward to hearing more.
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Scott Waterjet on September 17, 2019, 20:21:11 PM
Must admit I probably read 7000 - 8000 rpm rather than the 6800 - 7000 rpm  l-l
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Ross Goldsack - JBNZ President on September 17, 2019, 23:16:05 PM
Quote
  Must admit I probably read 7000 - 8000 rpm rather than the 6800 - 7000 rpm  l-l

 O))))
I was just pointing out that those engines make max power at those revs. So although 200hp sounds respectable out of a little 2400cc non-turbo, you have to spin them hard.
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Jeff B on September 18, 2019, 08:41:43 AM
While we're on the subject of 8000rpm....
I'd like to see the 612 perform on the Kawasaki ultra 300/310 engine?
Looks like the best effort so far is only absorbing about 200hp and going no better than a 200hp Suzuki m18 engine?

Surely you have experimented with finer impellers? All I have seen are 19 a d 21 deg?
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: GENERAL on September 18, 2019, 16:22:45 PM
the m18a engine is nothing special but it does match the 612 well. my m18a 612 went respectable but really made the boat after adding boost. the Whaaa pisssh factor is fun but adds alot of complication and engine stress to essentially get a stronger torquer power curve.

It would be great to have a new proven package in addition to the now very expensive and rare m18 that ideally didn't need a turbo. and as suggested the k24 and like are readily available.
It would be great to see some boats with jetski engines. Im sure there are plenty customers wanting to bolt jetski performance to an off self 2 stage robust unit
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Paul on September 18, 2019, 18:05:19 PM
It would be great to see some boats with jetski engines. Im sure there are plenty customers wanting to bolt jetski performance to an off self 2 stage robust unit
The 2-smoke din gets old pretty quickly in a boat, which is why the 4-strokes started to be used several years back.  I guess there are 4-stroke skis, but they are magnitudes more expensive, compared to a 4-pot 4-stroke auto-engine from a wrecker.
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Scott Waterjet on September 18, 2019, 18:55:50 PM
While we're on the subject of 8000rpm....
I'd like to see the 612 perform on the Kawasaki ultra 300/310 engine?
Looks like the best effort so far is only absorbing about 200hp and going no better than a 200hp Suzuki m18 engine?

Surely you have experimented with finer impellers? All I have seen are 19 a d 21 deg?

Hi Jeff B, We have some further testing planned. Just need to squeeze it in. Cheers

It's fair to say that the Ultra 310 is pretty noisy up in those higher revs. But if you don't mind running with ear muffs there is some performance to be had from that package.
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Jeff B on September 18, 2019, 20:34:38 PM
Another option, not sure why you haven't tried it?
The Honda L15.
Its small (skinny)
Lightweight(8-10kg lighter than m series.
Single cam ,(lightweight)
Single exhaust port (lighter exhaust)
Simple switched v-tec (will run on link atom)
Cheap
Readily available
Newer than m series? 2009-20014
The 612 still needs work to get the best out of one of these I feel, with 2x 19s it will likely only rev to 5200-5500rpm? And feel lethargic like a N/A m15a or m18a does on the pump.
Will need to get up to 6000-6500rpm.
Negatives are,
Needs a new intake manifold made,
Stock alternator is ecu controlled.
Title: Any Toyota candidates
Post by: Scott Waterjet on September 24, 2019, 16:53:05 PM
Thought some Toyota options may have been put forward!  --<
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Kakapo76 on September 24, 2019, 17:09:31 PM
You could try the 2zz ge engine- 190hp but its an oversquare motor so needs the revs up at the top end (8k) to develop that sort of hp- its a great engine and really well built, another option would be the 1zz-fe, its lower hp (140ish) but I have turbo one and it goes hard- how long it will last- no clue, I see these as similar to the m18a so not really an improvement but another option perhaps.
Title: Re: Any Toyota candidates
Post by: Jeff B on September 24, 2019, 19:54:14 PM
Thought some Toyota options may have been put forward!  --<

What about the Toyota GT86 engine then?
Nice and short.
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: lachlan on September 24, 2019, 20:52:30 PM
With a power band as wide as Australia 


And nearly as flat ...
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Scott Waterjet on September 25, 2019, 12:50:47 PM
With a power band as wide as Australia 


And nearly as flat ...
Do you have some power curves for this engine?
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: spinner on December 07, 2019, 21:46:43 PM
Regarding Jeffs earler post, wondering why the honda L15 needs new manifolds? Is it because the plastic ones will melt? Or are they overly complicated?
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: spinner on December 07, 2019, 21:52:04 PM
Regarding Jeffs earler post, wondering why the honda L15 needs new manifolds? Is it because the plastic ones will melt? Or are they overly complicated?
Title: Re: What motors would you like to be able to easily match to our 6.1" WaterJet?
Post by: Jeff B on December 08, 2019, 09:43:08 AM
Regarding Jeffs earler post, wondering why the honda L15 needs new manifolds? Is it because the plastic ones will melt? Or are they overly complicated?
Hey spinner. The Honda doesn't "need" a new intake manifold, the factory one will work fine in a jet boat but it sits up on top of the engine rocker cover so makes the engine 100mm higher than it needs to be. The factory throttle body is fly by wire so most will swap for a simple mechanical setup as well.