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Old 08-11-2019, 12:43 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
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Originally Posted by Raymo View Post
Correct. You can also disconnect the MAP line and it will not advance.
Don't think it works that way. As you climb, the air density decreases, resulting in lower ambient pressures. The Pmag will see that as reduced MAP (it cares only about inches of mercury at it's port and doesn't care if that is ambient or MAP) and start advancing according to it's table.

RV-6A / IO-320, Flying as of 8/2015
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Old 08-21-2019, 11:47 AM
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gmcjetpilot gmcjetpilot is offline
Join Date: Jan 2005
Posts: 4,110

CR does reduce detonation margins. Detonation is not detectable by pilot and can cause catastrophic failure (hole in piston). It is avoided by rich mixture and reduced power.

Engines in combinations of displacement and CR never certified are experimental.

High compression and more power can mean different power pulses and harmonics in crank and prop... See above... experimental.

I have a stock (except for EI) O-360A1A with 8:5:1 CR. I have no intent of running Mogas but I could. Higher CR forget it (please).
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