Gerard,
Not enough information for a really good answer. What are your peak
EGTs? Have you tried to run a GAMI Lean Test (
http://gami.com/gamijectors/leantest.php)
even though it may not be useful for a carbureted engine? At least study
the concepts.
My EGT probes are about 4" downstream of the exhaust and I peak at about
1450. 31 to 32 l/hr is about 8.2 to 8.45 gph. At cruise at
4500' MSL 2480 rpm and 25" MAP I burn about 10.6 gph and the EGTs are about
130-140 degrees Rich Of Peak. This is best power for the rpm/map
parameters. Of course, I am injected.
It is very difficult to control the power in each cylinder in a carbureted
engine since the throttle position may actually change the A/F ratio to each
cylinder. Perhaps you have recorded cruise parameters and those might help
with the analysis.
Generally, your EGTs seem to be too high and if running rich of peak, you
are in a very bad place to be running that engine.
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL
(KARR)
In a message dated 2/2/2009 11:13:00 A.M. Central Standard
Time, gerardoconnell@optusnet.com.au writes:
just burnt out the exhaust valves on 1 and 3 (got 900 hours on
my 0-320)
the shop reckons I'm running it too lean. I had an EDM 700
installed last year and follow the directions for best power-usually gives EGT
1450-1500 and 31-32 Litres per hour
what say
y'all
Gerard
>
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