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Showing results for tags 'fuel burn'.
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I replaced the fuel servo a few months back in my M20J, io360-a3b6d engine. Shortly thereafter, I noted an anamoly with fuel burn that is the inverse of what is expected - I burn more fuel as altitude increases. From memory, down at 2500 feet, 100 ROP yields approx 10.5 gph indicated at 24 squared. At 6000, same power settings require 11.5-11.7. I have a hoskins ft-101 that I am getting my data points from on fuel burn. I had a discussion about this with my mechanic and he explained that as a fuel servo goes bad, it dumps a bunch of extra fuel into the cylinder so when leaning prior to new fuel servo, I had a bad baseline to compare to. I challenge that, however, since I am not concerned with either a higher or lower gph reading, but rather what seems to be a mixture issue since I am requiring a richer mixture as I climb. Any thoughts?
