• If you see ads here, log in and they will disappear. If you need help logging in or getting registered, send request to: webmaster@southernairboat.com

True Mercruiser 260 hp

J

JD

Well-known member
Does anyone know how many H.P. a 1990 Mercruiser 350 c.i. 260 H.P. motor is at the flywheel. I don't remember when they started rating them at the prop. Could this be a 300 HP motor? This is for a jet drive boat I am building.
 
I'm getting the timing checked on the 180 this week so I'm fooling around with my other project(small block powered hamilton 212 jet drive). This boat is for going up shallow rivers with a load that would give an airboat fits. Plus it's hard to fish out of an airboat. How do you think the fasco super slick would do on an aluminum hull river boat that may hit a few logs now and then. Would it be to slick for cornering? The bottom will have a running pad and reverse chine to help in the curves.
 
JD, this is only my opinion but it's the shape of the hull, not the surface of it that makes it turn. I can't see how an application of slick coat would hurt ..... it might help to minimize damage in situations like you mentioned, running up on a log.
 
Olf, just didn't know how slick this stuff was. Is it easy to patch if I were to chip it in the future? This hull should have an easy life(it's already twenty years old) compared to that of an airboat. It had a 165 Mercruiser in it and I'm pulling that out and putting a jet drive with a V8. I'm going to have to redo the bottom completely and change the angle of the transom a few degrees to accept the jet unit.
 
Changing the angle of the transom shouldn't hurt as long as the angle you're going to is what the unit was designed for. The Mfr. of the jet unit has already worked all of those numbers out. Figure out how strong you need it and then add some more, and use the best materials you can find.

Jet boats are cool. The guys that run the Snake and Colorado rivers out West have some that are just plain Bad A**..... :evil:
 
Yea, thats where I got the idea from, the river jet magazine forum. If those boats can handle that stuff it should be able to handle what I have in store for it. And beleive it or not, the jet unit goes through about a 16' O-ring thats bolted in a frame thats bolted to the transom and thats it. All the force is on the jet unit and transferred to the bottom of the boat where it's bolted up.
 
Jim said, and he would know ...... he's the best researcher I've ever encountered. OK, 260 at the prop shaft is probably a little optomistic ..... look at a better intake, carb, and a set of roller rockers, MSD ignition, and you can probably pick up another 30 - 40 real horsepower. That should put you in at a solid 300, and get you in a pretty nice little setup.

JMO
 
Do you think there is any way this is a 300 hp engine already. I wonder how much a mercruiser loses through it's drive train???
 
You must log in or register to reply here.
Back
Top