Larry wrote:
RW Salnick wrote in news:e9o55a$2hq$1
@gnus01.u.washington.edu:


Don't forget that a diesel engine, which has no throttle butterfly, is
moving a lot of air out of the compartment all the time it is running




That's true in a Hatteras with twin turbo 8V92TA's in it....but not in a
sailboat with a two-cylinder Yanmar idling slow. Even wide open, it's
still two little diesel pistons pumping slowly up and down, not much of a
threat to pumping out the stinky head hose smell on other threads at all...
(c;

Assuming we are talking about a 2GM, displacement of say 600 cc, idling
at 1000 RPM, it is pumping 0.6/2*1000 = 300 liters/min of air out the
exhaust pipe. This is approximately 10 CFM - not bad for idle and a
small engine...

bob