[Vwdiesel] INCREASING AND DECREASING FUELING
Libbybapa at wmconnect.com
Libbybapa at wmconnect.com
Fri Dec 9 14:44:25 EST 2005
In a message dated 12/9/05 9:51:34 AM US Mountain Standard Time,
svend at prcn.org writes:
> --Andrew
> in Flagstaff----put an issue on the table that affects us all.---Thank you
> Andrew.. ---
> You may be wrong ? --but it got us thinking ? ---Ja.
>
I may indeed be wrong. I get what was said regarding increasing fuel merely
increasing power up to the point where efficiency drops off. That may be
true, but my imagination still has a little trouble with it. I imagine that boost
pressure is not just a function of fuel but also of the amount of air being
pumped in and out of the engine.
In a simplistic (or perhaps overly complicated) way, an non-running TD engine
being cranked over by another TD engine directly driven will still
potentially be able to get the turbo to spin and perhaps produce a negligible boost
pressure.
I imagine that if messing messing with the aneroid spring perch and cone
rotation one can achieve a situation where more air is being pumped into the
engine by the turbo than the pump is pumping fuel in to adequately burn. I imagine
there would be resultant losses in pumping that additional air through the
engine. The losses would be affected significantly by the proportion of blow-by.
Again, this is all based on my imagination and not any real hard facts, but
still it's my story and I'm sticking to it (for now).
Andrew
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