I have a carbureted 320. When I do the GAMI test, cylinders 1, 2 and 3 are 50°F LOP by the time 4 gets to peak. At this time it is just to rough. I then enrich the mixture by 25 to 50°F.

At 15,000 ft, I fly at 2,350 RPM, full throttle, 6.0 to 6.5 GPH and 170 to 175 KTAS.

With 43 gallons of fuel on board, this gets me from Detroit to Jacksonville in 4 hours with enough fuel left over to continue on down to KFLL.

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Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,615 hrs, N31161, Y47, SE Michigan