For a true "constant dribble" experience - some recent cars had
"throttle body injection" - pull the cleaner off one of those and watch i
at idle - 'timed port" gets my vote. direct injection has many of the
unmixed
combustion problem that you see in Diesels - Vance

>From what little I've learned over the last 24 hours, a dribble system would
be fine at the higher power levels an aircraft engine would be running.
At power, the fuel pressure would be enough to cause a fine mist of fuel.
So, downside is crummy idle. Upside is less electrical stuff to go wrong.
Is this correct Paul?


Phil Williamson

Yes.
I think Vance is more oriented towards trucks and not aircraft :)
Many many airplanes have been flying with constant dribbling fuel injection
for decades.

The innovation here is doing away with the mechanical pump and using the
electrical pump you need anyway and already have directly. Tracy's ECU system will
work fine with the addition of a high power pulse amplifier for the pump.

Paul Lamar

I think I'm catching on finally! Since an electric pump can be adjusted independent of RPM (which a mechanical pump can't do) you've moved towards a much less complex, but still very functional fuel injection system.

Phil Williamson

Very true. Well put.

Paul Lamar
 
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