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Antique Engine Archives All archived posts from 1999 to 2004 when SmokStak was on EnginAds. This is a read-only board.

Antique Engine Archives

Champion Spark Plug Question

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Old 12-22-2004, 09:17:20 AM
Neale Behm Neale Behm is offline
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Default Champion Spark Plug Question

Can anyone please tell me the difference between a Champion 25 and a Champion A25?
I have a couple NOS A25's that are of the two-piece variety with 1/2"npt threads. They seem quite similar to the older 25's sometimes used in Maytag or Hercules engines.
Since they are new I don't want to just try them as I'm sure they'd make good tradin' material still in the wrapper.

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Old 12-22-2004, 12:33:39 PM
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Mike Monnier Mike Monnier is offline
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Default Re: Champion Spark Plug Question

I have some of both in my engines. I assumed the A25 was just an updated part number for the 25. They look identical laying side by side.
Old 12-24-2004, 03:20:46 PM
Mark Birdeau Mark Birdeau is offline
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Default Re: Champion Spark Plug Question

Neale,the A25 plug is the old number that has been discontinued and replaced by the 25.
Old 12-24-2004, 09:10:46 PM
Tom G Tom G is offline
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Default Re: Champion Spark Plug Question

A NAPA parts man once told me that on Champion plugs, the letter prefix denoted the spark plug size, then the number denoted the heat range. The W series plugs are 7/8 straight thread. A W18 is a hotter plug than a W14. I'm guessing that the letter A just denotes 1/2 inch pipe thread.


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