no RPM drop on mag check

Dave Butler wrote:

(assuming the timing is wrong): the danger is (1) reduced power output? (2)
detonation? (3) inability to test magnetos at runup. Is that the kernel of it?

Reduced power, increased EGT, and increased risk of burning exhaust valves. Inability
to test mags comes way last. Risk of detonation is actually decreased (probably
eliminated).

By the way -- if my IA gave me the reply that he "would expect very minimal RPM drop"
after timing them, I would take it elsewhere to get the timing checked.

George Patterson
If a man gets into a fight 3,000 miles away from home, he *had* to have
been looking for it.

"G.R. Patterson III" wrote in message ...

By the way -- if my IA gave me the reply that he "would expect very minimal RPM drop"
after timing them, I would take it elsewhere to get the timing checked.


Excellent point. Most of the smaller ContiLycoSaurus engines
should show a minimum 50-75 rpm drop. This should be noticable just
by the sound. If the mag drop is not perceptable, that's a bad thing
and the IA should know that.

John Galban=====N4BQ (PA28-180)

Bigger bore cylinders (like an IO-360) should show even more mag drop
than small cylinders (like an O-300). It takes slightly more time for
the flame front to get across the cylinder head. Something is wrong
here.

wrote:
Bigger bore cylinders (like an IO-360) should show even more mag drop
than small cylinders (like an O-300). It takes slightly more time for
the flame front to get across the cylinder head. Something is wrong
here.

Thanks everyone. Despite gorgeous weather here, I haven't had a chance to try it
again lately.

Partly based on the feedback from this group, I went back to my partner who
manages the maintenance and asked him to investigate it a little more. He says
he tried it and got a 25 RMP drop on each mag. I haven't been able to check it
out again myself, but I'm wondering why he sees a 25 RPM drop and I saw nothing.
Anyway, that's where it stands for now. I'll let y'all know if I learn anything
more. Thanks for all the information and advice.

Dave