lutorm wrote:If we interpret "peak lean" as peak EGT, this instruction is wildly inconsistent with any other sources I've found which say that "full rich" usually is 250F rich of peak and that the "red box" where the engine should not be operated extends to 200F ROP for powers over 80%.
NWade wrote:I interpret the tuning instructions as saying that they want you to run the engine with the mixture knob pushed in to the full rich position. Then lean it out until the engine starts to run rough and check to make sure the peak EGT you see during that leaning operation is at least 90 degrees hotter than what you started with (at full rich mixture).
Basically, they want to make sure that your engine is running rich-enough at its richest setting, and 90-degrees of EGT difference is a minimum safe amount of "room" between full-rich and peak-EGT.
SonexN76ET wrote:Mike Bush has experience in running a maintenance management company, not designing and building aircraft engines. His advice often runs counter to the recommendations of major certified aircraft and engine manufacturers. He has no expressed experience with experimental or LSA engines. I would take his advice with a grain of salt. I take Kerry and the Sonex team’s advice as gospel.
Static RPM with the plenum was about 3220 while the others were around 3150, so that’s a good sign; whatever else is going on, the engine is making more power than it used to.
gammaxy wrote:When you get a chance, I'm interested in hearing more about the 250 rpm you picked up. If repeatable, that's pretty significant. When I read your blog previously, I interpreted this statement as meaning you got 70rpm:Static RPM with the plenum was about 3220 while the others were around 3150, so that’s a good sign; whatever else is going on, the engine is making more power than it used to.
50-70rpm is in the ballpark of the improvement I would have expected. 250rpm is really incredible.
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