Question about Compression Test and Spark Plug Removal

Here's my take. The numbers from a compression test can be used in two ways. One way is to compare to other motors with a similar set up. In this case, the operational temperature can make some difference in the numbers.

The other way is the use the numbers in a relative way to compare cylinder to cylinder. In this case, the numbers have more meaning as they releate to the other cylinders in the same motor. In this case, it is more important to test each cylinder in the same way (IE same throttle setting, at TDC and same temperature).

Frankly, I thought the thing about removing spark plugs at a certain temperature applied to the 3 valve heads. But the 3V spark plug is a different thing all of it's own. Never remove a 3v spark plug without throughly understanding the procedure and following it exactly.

For what it is worth, I removed spark plugs with the motor COLD tons of times. Now, I do use anti-seize and a torque wrench to re-install.

So how about splitting the difference and doing it WARM?

Remember to throughly clean the spark plug wells before removing the spark plugs. Very important.

also, if you use antiseize use VERY little, and torque all plugs to 14ft lbs!

compression should be within 10% of eachother.

Based on what you just published. Compression looks fine.

The TR6 is a great choice for plug. However, they will need to be replaced in 12-18 months or so.