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Re: Ford 9N fouling out plugs

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36 coupe

06-20-2013 03:02:00

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Ill try again.when I bought my 640 it had a new set of Champion H10s in it.I drove it 12 miles home,ran fine.It use it was fouling plug a lot.I put in H12s and the problem was gone.I did find that prolonged idling can foul the H12s so bad that you cant move in first gear.I had to bring the rpms up slowly until the fouling cleared up.Ive tested gas fouled plugs in the shop with a Model T coil.The spark runs up the nose of the insulator in thin streams.It CANT jump the gap.The fouling keeps the spark voltage low so you think you have weak spark as the problem.Most favor the Autolite 437 plugs.The Autolite 216 has the same heat range as the Champion H10.This has been posted many times but seems to be ignored .You have to use a HOTTER plug with unleaded gas.

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troubled 9N

06-20-2013 04:38:44

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 Re: Ford 9N fouling out plugs in reply to 36 coupe, 06-20-2013 03:02:00  
Thanks for the tip on the hotter plugs. I think along with the carburator, which seems to be running rich, we should be able to take care of this problem. Thanks again!

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