alpinelakespilot2000
Well Known Member
In the process of tracking down some high temps, I did a lean test through Mike Busch's Savvy Analysis Program. The lean range for my four cylinders are:
1-205F
2-222F
3-68F
4-62F
Test is conducted at 6000 ft at about 60-65% power, starting from full rich, then leaning until each EGT peaks.
Obviously, #3 and #4 are running really lean even at full rich. What concerns me is that if I'm running this lean at 6000 ft at 65%, how lean am I on takeoff while at lower altitude (1750 MSL) and at high power? Is it likely that #3 and 4 are in that range just rich of peak that should be avoided in order to avoid the risk of detonation? I'm particularly concerned given my #3 CHT can break through 400 in climb.
Savvy suggested checking for induction leaks on 3 and 4, and also commented that this could be the result of poor distribution on my carbed engine but, until I get that figured out, should I not be flying? Was headed to Arlington this week, but maybe not.
Thanks for the help. There are so many things I didn't think about before when flying planes without good instrumentation!
1-205F
2-222F
3-68F
4-62F
Test is conducted at 6000 ft at about 60-65% power, starting from full rich, then leaning until each EGT peaks.
Obviously, #3 and #4 are running really lean even at full rich. What concerns me is that if I'm running this lean at 6000 ft at 65%, how lean am I on takeoff while at lower altitude (1750 MSL) and at high power? Is it likely that #3 and 4 are in that range just rich of peak that should be avoided in order to avoid the risk of detonation? I'm particularly concerned given my #3 CHT can break through 400 in climb.
Savvy suggested checking for induction leaks on 3 and 4, and also commented that this could be the result of poor distribution on my carbed engine but, until I get that figured out, should I not be flying? Was headed to Arlington this week, but maybe not.
Thanks for the help. There are so many things I didn't think about before when flying planes without good instrumentation!
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