Rama,
I have a pair of GM 6.5 Litre V8 diesels driving through Mercruiser Bravo1 drives.
They're basically the engines used in the old 6.5 Turbo D Blazer, and the Hummer.
They have lower compression than the Automotive units tho' (18:1 instead of 21.3:1) are turbo charged and intercooled.
They make about 325hp a piece, max RPM is supposed to be 3600, but I'm over-revving slightly when maxed out to about 3800. (this makes getting on plane a lot easier, due to the high gearing, 1.36:1 + 30.5" pitch props).
The boat doesn't run all that nicely at lower speeds coz the pig iron in the back weighs over a ton, and until you're driving fairly hard it wants to porpois all the time, so cruising speed tends to be >55mph, usualy bang on 60 if the sea isn't too big. This equates to about 3200rpm, and I would say it's covered the majority of it's life so far at this speed/rpm or greater (190 odd hours so far)
That Suzi piston is a piece of art!!
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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