The Ford Barn

fisher · 10-29-2013, 06:28 PM

What is a good compression for my model A I am getting45 -50 psi when
Cold

Tom Wesenberg · 10-29-2013, 09:14 PM

I only have 50# but the car runs well and has enough power.

pat in Santa Cruz · 10-29-2013, 09:44 PM

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on a stocker, 60.

Uniformity of pressure is more important. A variation such as you have could be an inaccurate gauge, testing when cold, testing with the throttle closed. Tests should be done on a warm engine with the throttle wide open, three compressions per cylinder. If, after following this proceedure, you still get 45, try squirting some oil in the plug holes. If it raises the compression, the rings are old. A leak down test is much more informative.

10-29-2013, 06:28 PM	#1
fisher Junior Member Join Date: Oct 2013 Location: Scotland Posts: 11	Compression What is a good compression for my model A I am getting45 -50 psi when Cold

10-29-2013, 09:14 PM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Compression I only have 50# but the car runs well and has enough power.

10-29-2013, 09:44 PM	#3
pat in Santa Cruz Senior Member Join Date: May 2010 Location: santa cruz, calif Posts: 2,011	Re: Compression Sponsored Links (Register now to hide all advertisements) on a stocker, 60. Uniformity of pressure is more important. A variation such as you have could be an inaccurate gauge, testing when cold, testing with the throttle closed. Tests should be done on a warm engine with the throttle wide open, three compressions per cylinder. If, after following this proceedure, you still get 45, try squirting some oil in the plug holes. If it raises the compression, the rings are old. A leak down test is much more informative.