Re: 1930 7th Series- 320 engine- low compression issue- help sought...

Posted by Owen_Dyneto On 2024/4/11 12:18:10

To interpret your compression reading of 60 psi we need to know more about it, what altitude are you at and how did you conduct the test (choke and throttle valves wide open, 3 compression strokes to final reading?). Depending on that, 60 psi may be normal, a vintage Chiltons gives 62 psi as standard for the 726-733 motors.

Full choke to start a cold engine is a normal requirement, most especially for updraft carburetion which is more difficult to start cold than downdraft. I'd consider giving my ignition system a good thorough review to make sure it's giving peak performance.