Ed's suggestion to switch the mags off at 2000 rpm sounds like something that can cause a backfire and perhaps separation of the exhaust stacks. I rebuilt a Model A Ford ten years ago and being hasty with the spark arrestor at the wrong engine speed can damage several accessories. Switching mags at low rpm, as you would might do in a J3 cub when docking one on straight floats, is perfectly OK. Just my 2 cents worth of caution on doing it with high RPMs.
Best, John On Tue, Feb 24, 2009 at 11:34 PM, fnelson913 <[email protected]> wrote: > Thanks, Mike. I tried to switch between mags this Sunday, but the > problem was not present on either mag. It seems obvious that some part > of the ignition shielding is loose. I have not done the visual > inspection yet, so that is next. It would also help if I had a hard > failure rather than an intermittent one. > > Thanks for your suggestions. > > > Frank Nelson > N51DV - 415C > TOA > > --- In [email protected] <ercoupe-tech%40yahoogroups.com>, > Michael <captainmoonst...@...> > wrote: > > > > Sounds like spark interference to me. Have you tried turning off each > mag to see if you can further isolate the problem? Also, if you can > manage to look at your engine in the dark with the engine ticking over, > you may be able to see a spark from a leaky ignition wire. Might be a > good idea to move the spark wires around (temporarily and without the > engine running) then start up and see if there's a difference. Easy to > use harness testers are available from Spruce, etc, as well, as a last > resort. Kinda pricey, but at least you have a nice tool you can loan to > your friends. > > Mike, N93381 "Betty" > > > > >
