Steve Sampson
Well Known Member
My -4 with an O-320 and P-mags is still new to me, a little over 25 hours.
The P-mags are superb for me, but clearly behave differently to normal mags. I cant sustain a climb at 2700rpm and full power for very long (2 to 3 mins) without the CHT climbing fast also. (Admittedly I am babying the CHT because its a new engine and changing somethng to control the temps when they hit 400F.)
What i am finding though is a small reduction in the throttle (manifold pressure), together with a reduction in the rpm to say 2600, makes a very significant reduction in the issue. I am presuming this is because the presumably fully advanced mags start to move back from the max (of I think 39 degs.) Does this ring bells for other P-mag users?
I would be interested in other P-mag user comments.
PS I have the jumper in place, so the standard factory advance table.
The P-mags are superb for me, but clearly behave differently to normal mags. I cant sustain a climb at 2700rpm and full power for very long (2 to 3 mins) without the CHT climbing fast also. (Admittedly I am babying the CHT because its a new engine and changing somethng to control the temps when they hit 400F.)
What i am finding though is a small reduction in the throttle (manifold pressure), together with a reduction in the rpm to say 2600, makes a very significant reduction in the issue. I am presuming this is because the presumably fully advanced mags start to move back from the max (of I think 39 degs.) Does this ring bells for other P-mag users?
I would be interested in other P-mag user comments.
PS I have the jumper in place, so the standard factory advance table.