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Tracy Crook wrote:
One more comment on intake manifolds & race results. Do not ignore the benefits of a really clean air inlet with ram air recovery BEFORE the manifold. At 1125 ft msl, 220 IAS, I saw manifold pressures around 31.8" Hg. Ignore this factor and you throw away about 6% "free" horsepower.
Al, I forgot to comment on your last note about your MAP tap in manifold. I think it is highly possible you were seeing errors induced by air stream eddies or some other unpredictable factors caused by that location. It is a challenge to get MAP measurements when you have no real plenum, only runners with high velocity air.
Tracy
I have personally encountered this problem in a ground-bound rotary. Solved by connecting taps from each runner and running the resulting single line through a cheap plastic generic fuel filter(C) and MIG jet(R) before the MAP sensor. Basically, a physical RC network.
-Mike
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