Next message: (no name): "Re: T&T: Cat 3208"
In a message dated 4/27/2007 9:00:53 P.M. Pacific Daylight Time,
writes:
> I own a 48 Offshore with TAMD60C Turbo Volvos (210 hp, 1800 engine hours).
> The engines run fine, seem tight, good fuel economy, no blue exhaust smoke
> or
> soot on the transom, temps are moderate and steady, etc., but I can't
> reach
> maximum operating rpms/speed. When I bought the boat 14 years ago, she
> maxed
> out at 2400 rpm, which was about 14 knots (she got up on a plane at about
> 11
> 1/2 to 12 knots); now she maxes out at about 2100 rpm and 12 knots, and
> won't
It's sounds like your boat probably gained weight incrementally over the
last 14 years; battery banks; personal possessions, it all adds up. You are
"overpropped" and need to take some pitch out and maybe some diameter as well.
You want to prop for 50 rpm over max rpm. Should spin everything back up. Prop
people can do this easily; there is also a calculator on "Boatdiesel.com" that
will tell you if you when you are in the neighborhood of pitch, diameter,
and maybe cup. JWH
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