Has anybody installed a hi perf diesel in a cat ? I read here somewhere someone put a yanmar in an mti.

Never heard the final test numbers, or how well it got on plane etc.

Any info would help, Im thinking of puttying yanmars in a 32 skater with multispeed trannys and surface drives.

Curtis

I've seen them in the MTI which i think ran just over 100 and in a Nortech 3600.

I remember reading, but dont quote me, 102mph on the MTI

What do you consider "Hi Perf"? The Yanmar 440 or the newer 480 (500 hp)? Seatek?

The new 480 weighs in at roughly 1450 lbs minus gear. It gained some weight over the 440.

These engines might be a tight fit in the boat as they are longer than their V8 counterparts.

Anyone heard anything good/bad about the hammerhead V8's? Light, 948 lbs, 4,000 rpm and 400 hp.

Ilmor 625's with a 3 speed multi speed box in a flat deck 32' might be a far better fit.

A guy I know had what I believe were 440 Yanmars in a 36 Spectre with two speed trannies. He said he ran right about 100 mph, but he could have gotten more if he could get bigger props. He also said he ran in a poker run, and did some running after it and burned 80 gallons of fuel.

The same guy now owns a 32 Spectre with 625 Ilmors. He said the 32 has a better ride than his 36.

Im thinking the 480 yanmars not the new 500's they seem to heavy. Also Im thinking of a 3 or 4 speed tranny.

Props shouldnt be a problem.

Curtis

Yanmar is working on some stuff for a couple BIG cats, not sure about small though.. 480's in a 40 ft range rudder boat with Weisman trannys woudl be an idealk setup for me. You need a light boat to start with if your going to put diesels in, but it has to be big enough to be able to balance the boat properly. 32 will be too small with yanmars. Maybe Hammerheads woudl be better.
Ill also echo the statment about the Ilmors, especially with a quickshift tranny, would be awesome more power and lighter then a 525. Fastboats.com has a 32 spectre with ilmors i wanna check out.

Its only about 200lb heaver than a 525 merc.

There should be plenty of room to move it forward for balance, even in a 32. Dont really want to go with 36 to big.

Curtis

The 480 is actually 500 hp.

The 200 lbs is without the gear weight which might not be any more than the weight of a Velvet Drive (109 lbs).

The engine room in a 32' will be full with a 6 cylinder engine. The V8's are like 42" and the 6 cylinders need like 66" and the V10's ?? I think like 6" or so longer than a V8.

Wonder how smooth the Faulkner V12 would be? Light and torquey.

Hammerhead has the same dimensions as the V8 and relatively light.