Compression adapter

[Anonymous]

WTB has had no response to a compression adapter for my old motors that take a 7/8 x 18mm. This is a large spark plug hole.

How do you check the compression on these motors?

chuck86
PA
doggone@velocity.net

[dave-bernard]

try ebay or amazon for spark plug thread adapter. just a thought.

[wagemaker]

Here are a couple of possible work-arounds. http://forums.aaca.org/topic/167824-com … e-adapter/

[dave-bernard]

take an old plug and make one. to your liking.

[Mumbles]

By making these brass adapters for an old motor with large spark plug threads, I managed to kill two birds with one stone. Not only can I run modern, off the shelf plugs now, but I can also use my compression gauge. But like Dave mentioned, you can probably make one out of an old plug to.

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[billw]

"If it’s on your mind, it’s on eBay."

https://www.ebay.com/itm/New-18mm-Compr … SwMmBVuozg

Long live American manufacturing!

[Buccaneer]

Mumbles, nice looking adapter.
My Logan lathe doesn’t know metric,
so how do I tell it to make me an 18 mm thread? 😕

Prepare to be boarded!

[squierka39]

Spark plug adapters, there fairly common you can buy them.

[westwind]

The old 7/8 spark plugs are surprisingly inexpensive, I think I paid about $3 for a new plug for my row boat motor.

[dave-bernard]

I have an extra 18mm to 14mm if that helps 1 914 310 7086. Dave B

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