carl(at)flyers.freeserve.
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 Posted: Fri Feb 27, 2009 5:09 am Post subject: Europa-List: large mag drop on both mags C 912uls |
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Hi,
Its a long shot but the plug leads are also screened. Bearing in mind that 4 plugs are powered by the LHS mag and the remaining 4 by the RHS mag if one lead from each magneto set were shorting out the engine would be effectively firing on 3 cylinders.
We had a situation where one of our leads was shorting out which caused a mag drop on one side. Stripping back the screen at the plug end fixed the problem.
What you describe certainly sounds as if one cylinder is not firing on each set of mags. When both mags are live the problem would dissappear.
Due to the high voltage in the plug leads a short is much more likely here.
Crank the engine with the plugs unscrewed (but grounded) and it should be possible to identify the faulty lead. Just be sure there is no fuel vapour around (ie: drain the float chambers and disconnect the fuel).
PS: Rubber gloves are reccommended unless you want a shock !
Hope this helps.
Carl Pattinson
G-LABS
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