Tried calling Emag Air yesterday but it was late on a Friday. Here's my musings for which I need some opining...
I normally want to travel efficiently as possible so I'm usually 55-60% power as LOP as I can run smoothly on a carb. I'm running on a Slick Impulse on the left and a PMag on the right.
At low power settings (pilot or altitude induced) and leaned, the PMag advances the ignition to the point were the Slick Mag is dead weight. With the PMag spark doing all the work this tells me the combustion process is taking longer because of the single flame front. This would lead me to believe a more advanced (B curve) ignition would provide greater efficiency in this condition. However, if I switch to the B curve I would loose some detonation margin and also high-power/low altitude efficiency with the ignition advanced too much.
What are you thoughts regarding combustion delay with a single PMag?
Is the only way to get the best of both A and B curve worlds manually manipulating the advance in real time with EI Commander?
There's some conflicting information regarding the static/base timing of the A and B curves, I've read 20/25 respectively and 26.6/30.8 - Does anyone know what is correct?
This is on a RV-9A - O-320-E2D with 8.5:1 pistons FP prop
I normally want to travel efficiently as possible so I'm usually 55-60% power as LOP as I can run smoothly on a carb. I'm running on a Slick Impulse on the left and a PMag on the right.
At low power settings (pilot or altitude induced) and leaned, the PMag advances the ignition to the point were the Slick Mag is dead weight. With the PMag spark doing all the work this tells me the combustion process is taking longer because of the single flame front. This would lead me to believe a more advanced (B curve) ignition would provide greater efficiency in this condition. However, if I switch to the B curve I would loose some detonation margin and also high-power/low altitude efficiency with the ignition advanced too much.
What are you thoughts regarding combustion delay with a single PMag?
Is the only way to get the best of both A and B curve worlds manually manipulating the advance in real time with EI Commander?
There's some conflicting information regarding the static/base timing of the A and B curves, I've read 20/25 respectively and 26.6/30.8 - Does anyone know what is correct?
This is on a RV-9A - O-320-E2D with 8.5:1 pistons FP prop
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