Rex C

Spark Plugs

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Hi All,

A few months ago I acquired my first antique automobile, a 1938 Dodge Brothers D8 Touring Sedan. Mechanically it appears to be 100% original.

I've taken it to a couple of cruise nights and a couple of local shows where it won "Best of Show" in both.

Today I decided to take a look at the spark plugs. The current plugs are a Champion J11C which show some wear. Car has run fine since I've had it.

I have a copy of the shop manual which calls for a Champion J-8 gapped at .025". The current J11C's appear to have about a .033" gap right now.

My question is: are the J11C's the best spark plug available now and should the new plugs be gapped at .025"?

Thank you in advance for any info.

 

Edited by Rex C (see edit history)

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Benefits of AACA Membership.

The old J8 plugs are ordinary lawn mower engine plugs.

If you've had good luck with what you're using don't argue with success.

There are 10,000 more opinions about plug brands than there are brands.

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Thank you for your reply, cahartley. I remember my dad had a small engine (lawn mower) repair shop in the 50's and the Champion J-8 was the go-to plug for almost everything he fixed.

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I would check the measurements between the two plugs just to make sure that they fall into the same heat range. I would also keep the gap at the recommended spec.

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