Can anyone tell me what the cranking compression should be on a 74ci Pan kick start OEM stock camshaft?
Quote from: Mr. Torque on February 25, 2017, 01:47:43 AM
Can anyone tell me what the cranking compression should be on a 74ci Pan kick start OEM stock camshaft?
7.5 to 1
8 to 1
up through 1957
Later years I think boosted that up a bit, I'd have to check my files.
What year are you talking about? Bone stock?
:nix:
:chop:what I'm asking is what the compression test should read. I get 80psi.on the front cylinder and 75psi.on the rear. That seems low to me, but I can't seam to find anywhere what the cranking compression should be.
1958 74 ci it is supposed to be stock.
I have always understood about 100 psi for a stock well running pan is good. Anyway looking in the service manual I do not find anything-but the Clymer Manual has 90psi as your target.
Thank you, appreciate the help. I'm going to leak it down and see where it's blowing by.
Last spring I couldn't get my tired old pan started without a marathon of kicking-comp test had numbers half of yours. Good luck to you.
Quote from: Mr. Torque on February 26, 2017, 10:06:54 AM
:chop:what I'm asking is what the compression test should read. I get 80psi.on the front cylinder and 75psi.on the rear. That seems low to me, but I can't seam to find anywhere what the cranking compression should be.
I have my '65 on a battery tender and since it's raining this morning, thought I'd check cranking pressure on that pan. Good thing too, found the rear spark plug loose! :banghead:
Hope this helps.
:missed:
Yeah, 80 psi is a bit low. Hogmike shows what should be healthy.
That is cranking with an electric start though. Kicking it is a whole other world if you aren't aggressive enough.