Bike engine in 10ft jetboat

[Devil]

yer, our Buc was by no means fast but it'd easily tow a skier.

[gav]

Well if you can put a boat engine in a bike and race that, why not?? (Konig)

[Kickaha]

Well if you can put a boat engine in a bike and race that, why not?? (Konig)

You must be an old bastard if you can remember that

TonyB I have a mate who lives in Cheviot that has a boat like you describe with a GSXR1100 in it,haven't seen it going and know nothing else about it but could probably put you in touch with him if you want

[dangerous]

A stock 350 is about 200hp.
Clint

well I would have thought that a stock 350 is closer to 300hp and with minor work 350hp... this we puppy is out of the sprint boat (sonic pictured) and pumps out about 400hp.

Now a bike engine is most likley to pull to higher revs for a jet unit eg a seadoo 800cc twin carb pulls 130 hp (other pic) and ya arms off (ask manuboy lol) and it tops out at 6800rpm so a R1 or similer would be reving higher I would think.

Kawa do a 1200cc 4 stroke in a jet ski as do yamaha seadoos is a supercharged Rotax...... but all are desined for the jet ski, heaps of down low and less top end than a bike motor.

My bike engine pick for this 10"er would have to be a CX500/650 Turbo

[Blakamin]

well I would have thought that a stock 350 is closer to 300hp and with minor work 350hp...

Most people wish!!!! the work it takes to get a 350 (or most V8s) to have a HP per cube is unreal... especially if it was "stock" to begin with....

The 5737cc V8 engine was also used in the GTS, producing 288 horsepower at 4800 rpm

a bit optimistic, even considering thats the latest factory chev stuff

[Wonko]

Yes GPZ's are water cooled

[TonyB]

Thanks to all that have offered advice so far. Keep it coming.
kickaha, I'll ask Les if he's interested in seeing that GSXR engined boat- that Yoshi 1260 might be a go after all.
Flipper has dug up a complete ZZR1100 engine which sounds good, so I'll be giving the details to Les to see what he thinks. Is 70K high km for a ZZR?
As for the engine revving too hard, the reduction ratio at the drive sproket for my FZR in 1st is 2.571 and 2nd is 1.778, so that should work well. I guess other 1000's are in the same ball park.
As for HP, I prolly shouldn't mention this without the article to back myself up with some facts BUT ages ago I saw an article in Motorcyclist where a guy did a series of tests to find the ultimate 2 stroke pre-mix ratio for max HP. Can't remember what the ratio was, but I do remember it was way different to the usual 25:1, and is regarded as being impractical to actually use BUT this mystery ratio give significantly more power than 25:1, and he made the statement that all of the two stroke outboard manufacturers use this mix to do the power ratings on their motors. SOOoooo, what I'm trying to say is that if he is right, the rated power on a stroker outboard is quite different to what it actually produces, so if you can tow a skier behind a 90HP outboard in a 14ft fibreglass boat, then a 130HP+ ZZR motor in a 10ft tinnie should do OK. I'll duck for cover now

[clint640]

well I would have thought that a stock 350 is closer to 300hp and with minor work 350hp... this we puppy is out of the sprint boat (sonic pictured) and pumps out about 400hp.

We engine dynoed a stock 350 as part of a project at tech, it was running quite nicely, not tired or anything, & produced 198 hp at the flywheel.

Jets are less efficient (well kind of) than props so comparing engine hp & performance between them is not straightforward.

Cheers
Clint

[dangerous]

so if you can tow a skier behind a 90HP outboard in a 14ft fibreglass boat, then a 130HP+ ZZR motor in a 10ft tinnie should do OK. I'll duck for cover now

yeah mate I think it should do ok aswell, hell we ski behind the jet ski all the time :cool2:

We engine dynoed a stock 350 as part of a project at tech, it was running quite nicely, not tired or anything, & produced 198 hp at the flywheel.
Clint

damn..... I stand corected then, wait till I see the guy that built the sprint engine up :spudwhat:

[speedpro]

I've got mates who've built these thing in the past. As usual it ended up being a horsepower competition. Engine sequence more or less was 750 twin outboard, 1800 Subaru, turbo 2L Subaru, Mercury 375hp. The last one was wild, I've even got it on video.

[speedpro]

yeah mate I think it should do ok aswell, hell we ski behind the jet ski all the time :cool2:


damn..... I stand corected then, wait till I see the guy that built the sprint engine up :spudwhat:

Mate has a Corvette with a 350ci engine, supposedly 350hp stock. LT1 or 2 or something like that.