It was a single in a direct drive inboard Parasail boat.Never had a pyrometer on it .
The heat damage was the exhaust manifold melting through by the Turbo on 2 occasions and the turbos housings cracking after every thousand hours.
Engine never ran hot on the gauge And was always left to idle and cool down after running on plane.
Only answer I ever got from Yanmar was the motor was a light duty motor and if I wanted reliability to step up to the 350 engine whick I think is now a 420
I heard they where discontinuing the 315.
Buddy of mine that does all the warranty work on Hinkleys has had a field day working on the Yanmars lately.A lot of problems with the after market coolers and such on them creating major problems.
He told me Hinkley is swicthing to Volvos from now on.
Don't shoot me I am just the messenger.
Somebody please give me some real speeds with real prop pitch of 30' - 35' boats running their gas engines at 3,800 RPMs with bravo drives?
At 3800rpms, in my 32 Active Thunder with 1.36 drives and 24 pitch props, I'm right around 55mph.
My propslip remains pretty constant at about 13-14% from 3800rpms through WOT.
Last edited by Griff; 08-24-2008 at 05:23 PM.
That's what I was looking for. Metal's original question is based on a 1.5 reduction gear not the taller 1.36's you have. You validate my point that it's prop speed and not pitch for going faster, of course pitch plays into it but you need sheer rpm's to go fast!
Also how much Hp are those engines and at what max rpm? I'm driving at proving my point here a little more so help me out please?
Last edited by HabanaJoe; 08-24-2008 at 07:10 PM.
Actually probably closer to 12% since the pitch on stock Bravo's is on the heavy side.
Last edited by Griff; 08-24-2008 at 07:10 PM.
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