nigelspeedy
Well Known Member
G'day All,
I have a new engine with dual PMags. It has high compression and I want to be nice to it during the initial break in flights. Based on what I read I am probably better off with a little less advance than a little too much.
What I think I want to achieve is ~20 deg BTDC at high power, with no more than 30 deg BTDC at low power settings.
The Max Advance setting using the EICAD seems pretty easy and I've set that to 30.8 deg.
I've set the Max RPM to 3072 to help protect the prop if for some reason it wants to overspeed.
The Advance Shift I have set at -5.6 deg, which is based on my understanding that the timing at high power with 0 deg Advance Shift results in ~26 deg BTDC with mags timed at TDC. i.e. 26 deg - 5.6 deg would result in a new max power timing of 20.4 deg which is close to what I am aiming for.
Am I in the ball park here? I'd be happy to hear from those of you with more understanding of the PMAG default max power advance and use of the EICAD.
Cheers
Nigel
I have a new engine with dual PMags. It has high compression and I want to be nice to it during the initial break in flights. Based on what I read I am probably better off with a little less advance than a little too much.
What I think I want to achieve is ~20 deg BTDC at high power, with no more than 30 deg BTDC at low power settings.
The Max Advance setting using the EICAD seems pretty easy and I've set that to 30.8 deg.
I've set the Max RPM to 3072 to help protect the prop if for some reason it wants to overspeed.
The Advance Shift I have set at -5.6 deg, which is based on my understanding that the timing at high power with 0 deg Advance Shift results in ~26 deg BTDC with mags timed at TDC. i.e. 26 deg - 5.6 deg would result in a new max power timing of 20.4 deg which is close to what I am aiming for.
Am I in the ball park here? I'd be happy to hear from those of you with more understanding of the PMAG default max power advance and use of the EICAD.
Cheers
Nigel