Compression tester

Most of the suppliers sell a spark plug adapter so you can run modern 14mm plugs. This will let you run a compression test using a standard 14mm fitting. Snyder's part# is A-12405-ADP $6.75. It's what I use.
 
jdpalmer said:
Has anyone made an adapter to check compressor on cylinders that fit in spark plug hole
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Yes, using old plug bust off porcelain JB Weld together or purchase from vendors.
 

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Gary WA said:
Yes, using old plug bust off porcelain JB Weld together or purchase from vendors.
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I busted the porcelain insulator out BUT did not have to JB weld in a adapter because my compression gauge has a large rubber tip that fits the opening and I just press the gauge into the hole and take a reading. 👍 😷
 
I busted porcelain out of an old plug and then threaded the hole with pipe thread tap and adapted to gauge thread.
 
Older plugs come in 2 parts great for compression check or welding an eyebolt for engine removal.
 
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