Compression tester 14mm and ?? reach

[kilgorekb]

Instructions say to screw in to the same depth as plug, which is 19mm (3/4''). However, the only compression tester kits I see only specify 14mm thread. Am I to assume these will reach at least 19mm depth or should I get an adapter which specs list 19mm reach?

I'm looking at this one since it's the cheapest I've found.

 

[Dr Honda]

As long ans it's not LONGER than the spark plug... you are fine.

 

[kilgorekb]

So the extra volume which results from a shorter reach is insignificant to the PSI reading? If so, are implying that the reach specification is just to prevent possible damage?

 

[Dr Honda]

It can change the numbers... but it's not going to be major. Maybe a few PSI. If you are worried about volume... then you would also need to take out the hose.

A lot of the guys here have the tool from Harbor Freight. They are inexpensive, and are known to be reliable. If you catch it on sale, and use a 20% coupon... you can get them for $10 to $15.