Run up Mag drop - one mag and one electronic

[markscogg]

Originally Posted by gasman

I have a 320 fp. mag on left and a LS on the right. At 1600 rpm, when I shut off the MAG..... no change. When I shut off the LS, I see a 100 rpm drop.

At 800 rpm, IT IS REVERSED!

Yes, mine is reversed at 800 RPM. Drops a lot with EI off, no real drop in mag this low.

I will check the switches this weekend, but 99% sure they are correct. I can pull the breaker on the EI to test.

Thanks

[kellyp]

Originally Posted by markscogg

Wow, 1900 RPM would be almost full power with my fixed pitch sensenich prop. I show 24" MP at 1800 RPM. That speed gives 125 drop when I turn off the mag. Half that when I turn off the EI.
You must have a C/S prop?

I do my runup at WOT to see if my engine is producing the same power as the last flight. It is ~2100 RPM on a hot day and 2150-2200 on a cold day. Altitude also has an effect. Left Slick drops 50 RPM when off, right EMag drops 100 RPM. Engine is O-320 with 9.2:1 and prop is Sensenich 83" cruise pitch.