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Old 04-12-2005 | 06:37 PM
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Flyer Freq
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From: Appleton, WI
Default RE: GMS Engine Tuning Problem
ORIGINAL: Harry Lagman
I recently tached a couple of GMS .47s with stock exhausts with the 12 1/4 x 3 3/4 APC prop while helping set them up. We got between 11,700 and 12,000 at sea level. Your 12,080 seems about right based on my experience with these engines. The 14,800 must have been a false reading.
I suppose it is possible it was a false reading. The only other factor that was different, was that the 14,800 was taken in 20 degree weather, vs 60 degree's with the 12,080 on my engine. I don't think that can account for the 4,720 RPM difference, though

Andy.
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