Re: Don’s 1937 (120) 138CD Deluxe Touring Limo

Posted by Don B On 2024/5/5 18:03:33

Okay…yet another question.

In the Classic Car Restoration series (Mark Lambert), he also showed how to check compression. Completely new to me, but decided to try it. Now, I bough a very inexpensive tester. Many of the reviews mentioned that it seems to read low and many comments were that it seems to read about 75 psi when other/better testers read 100psi. As such, I am not really concerned about the actual numbers, but the amount of variation does have me concerned. Looking for guidance….

In the video, Mark states that Packard allowed up to 20% variance between cylinders. As you can below, No 5, 6, and 7 vary significantly more than that.

Here are the numbers which were repeatable.

No 1 - 75 psi
No 2 - 65 psi
No 3 - 68 psi
No 4 - 65 psi
No 5 - 55 psi
No 6 - 52 psi
No 7 - 52 psi
No 8 - 75 psi