Someone is putting a 1400CC Suzuki auto engine in a jet boat. http://meanchicken.net/webmain/forum/viewtopic.php?f=89&t=8585
Someone is putting a 1400CC Suzuki auto engine in a jet boat. http://meanchicken.net/webmain/forum/viewtopic.php?f=89&t=8585
Last Busa engine I sold was 800 dollars with the harness, Sell the Bandit 1200s for 300-500 with harnesses depending on miles and mods.
Look for wrecked bikes at local auctions. They total out with minor damage and still a lot of life left in them.
What do I win? (this rev range is much better than a 4 cyl)
Not 4 cylinder, not automotive. I'd say you lose 
All of the air cooled engines will need auxiliary cooling.
Ford 1.0L Eco Boost. I know, only 3 cyliners.
ProDarwin wrote: Not 4 cylinder, not automotive. I'd say you lose
Ah, you're correct, i didn't read the title, just the first post description.
Is the "automotive" requirement so that it has closed loop cooling? is there a reason why you need a 4 cyl? (even little sportbikes will make your power requirement, but spin really fast)
ProDarwin wrote: A DOHC Saturn S-Series (LL0) weighs 213lbs **dressed**. That's an easy 124hp. Its also available by the billions in junkyards for $cheap. Seriously, walk into any you pull it yard and there will be 50 of them. $100 later you have your answer. 3rd gen motors may weight a tad less due to the plastic intake manifold, most of which is likely offset by the 4 (vs 2) counterweight crank. It'll respond well to breathing mods, but anything over ~170 crank hp and you'll want boost.
I came in here to post this Saturn engine, but it looks like ProDarwin beat me to it. I'll give it a plus one here. Electronics are easy and straight forward. Pre-OBDII are available. LIGHT. POWERFUL. and CHEAP CHEAP CHEAP.
They didn't make it very far as an engine transplant due to the lack of easy rear wheel drive transmission, but since you will be fabricating your own connection to that prop shaft I think you have a winner with the Saturn DOHC. Did I mention CHEAP and PLENTIFUL!
The super high power bands on the motorcycle engine are the problem. 120 hp at 14k won't do the job, because of the cavitation issues discussed earlier. I need 120 hp at 6K-7K rpms and good cruise power at 4K rpms. The automotive engines are also cheap and plentiful. New Zealand jet boaters use a lot of Suzuki and Subaru engines in their smaller boats. I've found a 155mm pump for $250. I just need a compact, light, reasonably powerful, engine to drive it.
And cheap, cheap, cheap. The Saturn stuff is looking promising. They are dirt cheap.
Hard to find here, but Sunbeam Imp used 875 or 1000 cc Coventry Climax engines that only weighed 150 lbs or so.
it adds complexity.. but you can put a higher revving engine in if you are willing to add a reduction box
4AGE 20 valve weighs 300 lbs fully dressed and has 160 HP. 5K RPM for about a thousand years if you change the oil.
wspohn wrote: Hard to find here, but Sunbeam Imp used 875 or 1000 cc Coventry Climax engines that only weighed 150 lbs or so.
39hp might be an issue though. Also head gaskets are an issue. Not a lot of meat in there for salt water corrosion. In this country they are as rare as rocking horse E36 M3.
Toyman01 wrote: The super high power bands on the motorcycle engine are the problem. 120 hp at 14k won't do the job, because of the cavitation issues discussed earlier. I need 120 hp at 6K-7K rpms and good cruise power at 4K rpms. The automotive engines are also cheap and plentiful. New Zealand jet boaters use a lot of Suzuki and Subaru engines in their smaller boats. I've found a 155mm pump for $250. I just need a compact, light, reasonably powerful, engine to drive it. And cheap, cheap, cheap. The Saturn stuff is looking promising. They are dirt cheap.
Stupid question time. Wouldn't robbing the engine and jet pump out of a used jet ski be the easy button?
In reply to spitfirebill:
I think that the ones in his price range are likely way too low on power.
singleslammer wrote: In reply to spitfirebill: I think that the ones in his price range are likely way too low on power.
Could be. I toyed around with buying one years ago. You can get them pretty cheap, but wasn't sure of the HP ratings.
mad_machine wrote: it adds complexity.. but you can put a higher revving engine in if you are willing to add a reduction box
Which conveniently comes integrated as part of the engine block with 5 or 6 reduction speeds available. Shift on the fly too...
sounds like a job for Felix Wankel and his magical spinning nacho-cheese flavored corn chips.
ACVW with a turbo!
Snowmobile engine? Light, simple, compact and the CVTs that they use means they are designed to hold sustained mid-high rpms. Plenty of power as even a half liter engine can get you 90hp, the 800cc engines are 160ish. Can usually be had for a few hundred.
I know, it's not automotive and usually not 4cyl...
In reply to MacDubois:
Most of those are 2 strokes, aren't they? I'm trying to get away from the 2 strokes.
My current jet boat uses a 650cc Yamaha 2 stroke. It's noisy, vibrates, smells, makes a mess in the bilges, I could go on.
Honda D15 and D16 are light, but have rice tax (due to the chassis they start in)... you know what's not? (and under 150lb?) the D17, which came in about a billion cars from 2001-2005 in honda civic guise. rev to about 7k, make about 125hp (and about 110lb/ft), and have easy parts availability.
also: here's a link to Another Thread from a while back on this very topic.
would something like a Honda VFR work?
In reply to Autolex:
And it spins the wrong way so it isn't really much use outside of a honda chassis
Toyota NZ engine? HP is a bit low, but the engines are probably light.
The Saturn motor sounds like a good fit.
A Datsun A-series engine is probably one of the lightest motors out there. I weighed both the A12 and A15 engines in my 1200 coupe. Complete with fluids clutch starter et al are 184lbs and 193lbs. The clutch and pressure plate are 8lbs so for a boat I assume you wouldn't need that so the motor would be as little as 176-185. Note this is with a header (the stock cast iron manifold is something like 12lbs.The down side is these likely won't make the power you need; the A15 makes 80hp stock, with mild cam, cleaning up the ports, weber DGV & header would bring it up to around 100-110. The A15 in my car is around 125-130 at the flywheel but building one to that spec while not expensive it wouldn't be cheap and likely cost about $1500. The plus side of the A-series engines were manufactured from 1971 to 2007.
Tom
Not sure on the availability. But a Nissan cg13 isn't a bad little engine. Close on Power, 7300rpm redline..
Mostly found in k11 Nissan Micra'a . But also saw a lot of use in nissan forklifts and powerboss sweepers. And let's be honest, it has to be able to cop a flogging if it's going to be in a fork.
Cg engines also came in 1l and 1.4l
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