Glad you found the problem Buly.
Before risking a trip near the meat grinder, always try the Mode 8 ignition
timing adjustment. You can move the timing up to + or - 10 degrees from
the comfort of the cockpit. This is enough to indicate whether more
change is necessary. Then you can go adjust the crank sensor with
engine stopped and go back to adjusting from the cockpit. I would suggest
turning the CAS in 10 degree increments. (use the 30 degree trigger
wheel teeth as a guide to how far you are turning the CAS) Remember
to set the timing back to nominal (center of range) in mode 8 before
adjusting the crank sensor.
BTW, retarded timing might explain some of the cooling problem as
well.
Tracy
----- Original Message -----
Sent: Sunday, April 16, 2006 7:59
PM
Subject: [FlyRotary] One big problem
solved
From the beginning of running the engine with the prop on, I
could
not pass the 4000 RPM static barrier. First I run it with the
prop I
made that it is rather large 3 bladed 70" prop. I thought
that I was
just over proped. John Slade landed me his prop that's
smaller
diameter 64" and the blades have about 25-30% smaler area
surface.
Same static performance. I had fuel pressure, manifold
pressure all
the way to 60", but it will not budge past 4K
RPM.
So I took to Tracy's manuals. One paragraph mentioned to adjust
the
timing at 4K RPM with engine and prop running. AHAA!
Me and
the neighbor made degree wheel and new marks on the pulley per
Tracy's recommendations. Last evening I volunteered my neighbor to
do
the timing light magic and move the crank angle sensor on top of
the
screaming engine and prop, while I was the "throttle man".
By
9 PM the engine passed 4700 rpm static and was ready to go
further,
but the coolant was getting too hot and I ended the
experiments.
So, if everything else fails you turbo rotary guys, set
your timing
at 4K RPM static per Tracy's recommendations
:)
Buly
Next problem installment
coming....
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