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EGT reading means (almost) nothing.
They are neither too high or two low, since the absolute temperature reading is
highly variable depending on probe location.
The only use for the EGT (but it's an
important one) is to know where, as you lean out the engine, your peak EGT is
reached. Then you are able to decide whether to run 75 degrees ROP or 50
degrees LOP. It doesn't matter if it is 50 degrees lean of
1550F, 1475F, 1400F or any other number.
In short, the absolute value of the EGT
reading is not of great interest....only the trend of the EGT as you lean out
the engine.
Chuck
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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