Topic Author
Posts: 99
Joined: Wed May 25, 2005 12:29 am

Spark Plugs

Fri Jun 17, 2005 1:09 am

Anyone know the difference between massive vs. fine wire spark plugs? I know the fine wire will last commonly until TBO, but are there performance differences.
Posts: 694
Joined: Sun Nov 21, 1999 11:44 pm

RE: Spark Plugs

Fri Jun 17, 2005 11:07 am

Hi PlainSmart, Buzz here. Well, the fine wire plugs tend to foul less: i'm thinking of 65-100 hp engines on an Aeronca Champ that were made to run on 80 octane avgas... 100LL has 4 times more TEL than what is required.
I didn't see much of a difference on that airplane, we had some fine wire plugs and decided to try 'em.
Normally we see a little bit of "junk" (combustion deposits) deep down in the sparkplugs. But it doesn't cause enough fouling to make a bad mag drop during run -up.
We use massive electrode plugs on the DC-3 i play with, they're about 1/3rd the price of fine wire plugs. It makes a difference when you need 28 sparkplugs per engine.
Buzz Fuselsausage: Line Mechanic by night, DC-3 Crew Chief by choice, taildragger pilot for fun
Topic Author
Posts: 99
Joined: Wed May 25, 2005 12:29 am

RE: Spark Plugs

Sat Jun 18, 2005 5:28 am

Thanks for the insight. Good call on the price especially when 28 plugs a side. I had heard about the less fouling idea also.

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