We are still very early in our engine break-in. (0320E2G 160hp carbureted) we have about 3hrs in the air and about an hour on the ground. Following the Lycomong break-in procedure for channel chrome bore cylinders. We are still running full rich 75% power at 4000ft. The CHT's are still averaging 370-390 degrees but have dropped from around 400 since the first flight. I guess my question is; is black soot in the exhaust tips which I understand is caused by running excessively rich mixture, normal or is it a sign of improper break-in or a major malfunction? We can't lean the engine because of the still high CHT's.
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Arlie Conner (A&P)
RV-4 (N124TT) Sold
RV-8 (N269CP) Sold
RV-4 (N684ML) completed 3-17-19
KOCH Nacogdoches
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Keep running at full power and full rich until you get to 10 hours. Once you start learning it, your exhaust will turn grey.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC www.repucci.com/bill/baf.html
Black soot exhaust tips
Linear Mode
