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Electronic Ignition problem - any suggestions?

 
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peter(at)sportingaero.com
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PostPosted: Thu Nov 06, 2008 2:33 pm    Post subject: Electronic Ignition problem - any suggestions? Reply with quote
As a follow up, my friend could not get any sense out of Electroair so
replaced the EI with a mag. Same problem still evident! Probably why
Electroair comments made no sense ...

After further investigation it seems that one of the inlet valves is
leaking at high BMEPs, such that small reductions in throttle reduce the
cylinder pressure sufficiently to stop the leak. The blow back into the
inlet system was enough to cause a serious miss fire. Switching off one
mag was probably the equivalent of a "small reduction in throttle" so
the implication that the EI was at fault was a complete red herring!
This also explains why the miss fire was throttle setting dependent,
rather than rpm dependent.

Cylinder repairs now underway - I'll post again once this problem is
finally licked.

Peter
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