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Re: Re: Re: higher RPM or higher gear?
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Posted by mj on April 30, 2003 at 07:27:29 from (216.52.32.179):
In Reply to: Re: Re: higher RPM or higher gear? posted by Farmer in the Dells (WI) on April 30, 2003 at 07:07:34:
W.O.T. = Wide Open Throttle or WFO (Wound
Flat Out ...or... Wide Freaking Open...depends
on your generation as to the definition of
WFO). When you are pulling hard at a lower
RPM you are also turning the water pump and
fan at a lower speed and, therefore, lower
capacity which compounds the heat being
built up by the load. For instance: when pulling
a load up-grade with an over-the-road tractor
and the engine temp and/or pyrometer heat
gets 'critical' the solution is to 'drop a gear'
even though you were still in the engines'
operating range. As an aside: the 'Flex or RV
fan' concept (the fan blades straighten out and
produce less drag, and airflow, to give better
fuel mileage at high engine rpm) seems
exactly opposite to what is needed when you
are pulling a steep grade and have to gear
down. The lower gear produces more rpm,
less airfow due to less road speed AND the
fan blades straighten out? Just doesn't
compute for me! :-)
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