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<< Lancair Builders' Mail List >>
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George,
Thanks for the confirmation of our observation. I have no doubt that the
induction system used in my engine, an I/O 320 with the forward mounted
throttle body, is incapable of delivering air equally to each of the four
cylinders.
I am considering shrouds for the injectors but first I will be experimenting
with managing the injector environment with bits of baffling along with
adjustments to the cooling airflow the better even the CHTs -- all assuming
that EGT and CHT data collected from my VM EPI 800 system is accurate -- and
remembering that the cyl #1 CHT probe had to be bent to fit along side the
exhaust pipe with a SS shield to keep it (the probe) from cooking.
Also, Lancair 320/360s do have a prop extension (I use a Hartzell compact CS
prop) and I have modified the cooling air intakes with interior
increasing-diameter trumpet horn like surfaces to slow down the air. These
work as I have pretty good cooling efficiency, but the un-impeded airflow to
the #2 injector was quite direct and is significant.
Before collecting data for possible future Gami-injector use, I would want to
make sure I have controlled as many variables as I can. The reason for my
recent examination of the engine running parameters is my use of the Lasar
electronic ignition that changed the way fuel and air are converted to power
(heat). Since more combustion occurs in the cylinder and less burn in the
exhaust pipe I am seeing the forecast 80-100 degree reduction in EGTs and a
20 degree rise in CHTs. Because of the rise in CHTs, I am more interested in
equalizing the power (heat) produced by each cylinder to more effectively
lean and reach engine Nirvana - Best Power, Smooth (4-cyl oxymoron), Cool
Running and also beat the flaps off less tuned Lancairs carrying around 360s.
Scott Krueger
PS - Grease, pay attention.
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