Spark Plug Thread Spec

Posted by Doug Kieta on June 30, 2007 at 10:12:20 from (71.12.186.232):

I want to purchase a compression tester for my '49 SA and my '51 H. The Champion spark plug book shows that the thread on their recommended plug, RD18Y, is 18mm. I find that hard to believe because metric threads were not utilized back in those years. The only tester I can find has 14mm and 18mm threads. I want the screw-in type fo tester so that I can leave it in the cylinder when I crank the engine.

Does anybody have an H under restoration? If so, would you mind checking the plug thread to see if it really is 18mm rather than an SAE thread?

Thanks for the help.

Replies:

• Re: Spark Plug Thread Spec CGtractor 14:16:48 06/30/07 (0)
• Re: Spark Plug Thread Spec EL Toro 10:25:44 06/30/07 (0)

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