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Old 25-05-2007, 19:36   #13
cat man do
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Join Date: Aug 2006
Location: Brisbane Australia [until the boats launched]
Boat: 50ft powercat, light,long and low powered
Posts: 2,251
Quote:
Originally Posted by cal40john
My manual for my Yanmar 3GM30F states that the max continuous rpm is 3400. Max intermittant is 3600 rpm. I'll have to go back to the manual to make sure, but if I remember right, intermittant means no more than an hour or so at max intermittant. The manual also states not to run the engine for long periods under 80% throttle (or power? I don't remember). If you are going to run under 80% throttle an extended time, rev the engine to higher rpms every hour or so. I believe the manual says to operate it this way to not accumulate carbon in the engine and to not glaze the cylinder walls. I've been running mine at minimum 2900 rpm for cruising speed.



John
80%, Is that where the maximum torque is?

I was told that we would be fine running our Cummin's B3.3 65hp motors at max torque, which put's out max torque of 50hp @ 1500rpm and 65hp @ 2600rpm.

I hope that is right, 'cause that was our plan.

Dave
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