"WaIIy" wrote in message
...


Get realistic here, we are talking about boats.


Okay, why don't you get realistic?

If you read back on the thread of discussion you may notice that there had
been some discussion about the amount of air the engine was going to draw
into the engine compartment. That is a relatively easy thing to calculate
IF you assume that the engine is operating at a reasonable RPM (no
significant restrictions in the intake) AND it isn't being throttled. An
engine has a certain amount of displacement. If it is a four cycle engine
(and isn't throttled) it will draw that much air every two revolutions.

If the air flow into the engine is restricted then the calculation is much
more difficult. However, if the bit of information you are interested in is
the maximum air flow that you need to be concerned about then assuming WOT
is a reasonable approach. As you throttle the engine the situation will
only get better.

The bottom line is that a typical engine running at typical RPMs will draw
less air than a typical exhaust blower will.

Rod