Mag Drop

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Russell Myles

Well-Known Member
Joined
May 11, 2003
Messages
88
Location
Scotland
Hi folks, pick yer collective brains if I may....

Picture the scene...Homebuilt aircraft coming up for annual renewal.
Bit of a mag drop on groundrun...

RPM 1200 1400 1600 1800

Carb -30 -40 -40 -45
L Mag -80 -70 -80 -80
R Mag -90 -150 -160 -130

Cleaned the plugs - no change
changed the plugs - no change
checked ignition harness - seems correctly rigged iaw Continental O-200 manual

the next steps involve stripping hoses, baffles, exhausts etc to get at the mags at the back of the engine in order to...
1) remove and test the ignition harness, then
2) remove and bench test the mags

Long shot I know but can anybody think of anything else we can check before going down this route? It looks like it's going to be expensive so I'm clutching at straws here....

Russell
 

BD5builder

Well-Known Member
Joined
Jul 29, 2005
Messages
102
Location
Greenville, SC
Check your Magneto to engine timing.
Get a high current lead tester an the the leads
If those don't work, pull the mags check the points gap, and possibly overhaul the mag's...


But its Most likely the magneto to engine timing.
 
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