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When I had my engine torn down for a prop strike at 700 hours, the engine shop pointed out pretty worn exhaust valve guides. They said that the guides wouldn't make 2,000 hours. I had them replaced. I now have over 1,500 hours on the same engine and it is running fine.
The engine shop and I have always argued about how lean to run the mixture. They like richer. I run as lean as possible. Flying locally, I usually fly at about 2,350 rpm and 22-23 inches of manifold pressure and as lean of peak as possible. More usually, I fly high (15,000 ft) running 2,350 rpm and lean of peak. That gives me about 1,420 EGT and 22-27 l/hr (6.0-7.0 gal/hr). At all altitudes above 5,000 ft, I fly at full throttle. Unless racing, I never fly above 30 l/hr (8.0 gal/hr) as that is my 75% power point. At 5,500 ft at 30 l/hr (8.0 gal/hr), I run at 195 kts.
Last month, I was flying at 15,500 ft at my usual 2,350 rpm and lean of peak at 22 l/hr (5.8 gal/hr) at 170 ktas (130 kias). I then tried winding it up to 2,650 rpm and enriched to 28.4 l/hr (7.5 gal/hr). My speed went up to 185 ktas (145 kias). Even after flying this plane for 10 years, I was amazed at the speed at which this carburated, mag powered 160 hp aircraft could travel.
Only time will tell about the leaning. I fly consistently and can only hope that I will get to and past 2,000 hr TBO.
Lorn
From: gerardoconnell@optusnet.com.au
Date: February 2, 2009 12:11:44 PM GMT-05:00
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
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,515 hrs, N31161, Y47, SE Michigan
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