Have approx 500 hrs on a IO360 A1A. Been noticing it doesn't take long for the oil to turn dark. Did compression test recently and all around 79/80. Assuming blow-by, listened with a tube in dipstick hole and can hear a little hiss while testing each cylinder. This was done before a flight but after rotating propeller. Not sure if a little hiss is expected but assuming combustion gases getting to crankcase. Is it advisable to rehone and new rings? Will I need oversized rings if rehoning these steel barrels? Btw not using excessive oil but about a quart every 6-8 hrs but seems to have always been that way.
Dave Ford
RV6
Dave Ford
RV6