A thaught from the
sidelines:
With this reversed pressure situation -- is raw fuel able to escape the
nozzles onto a hot engine?
Mark Ravinski
N360KB
The conclusion is that when manifold
pressure starts to exceed the ambient pressure, i.e., the pressure in the
cooling plenum, the venturi effect that provides atomization of the fuel charge
in the injector nozzles quits. When the pressure gets "upside down," air
is no longer drawn into the fuel charge, and this is apparently rather upsetting
to the engine, which displays its pique (sorry, bad pun) by going very
quiet.