The Ford Barn

johnsor · 10-27-2013, 03:28 PM

A few years ago, I installed a Brumfield H.C. Cylinder head. I never had the occasion to check the cylinders compression until yesterday. To my surprise, I measured 108 to 110 lbs. on all four cylinders. I performed the test twice with a quality gauge with the same results. I had a hard time keeping the gauge seated in the plug hole. No wonder this Model A Roadster is so peppy. Thanks L. Brumfield.

Walt Dupont--Me. · 10-27-2013, 05:54 PM

What bore is your engine? I have a police head on mine with .060 overbore, compression 100# right across. Walt

bettlesr · 10-28-2013, 10:21 AM

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Mine has a .100 overbore and a 7:1 Winfield head. The compression when I checked yesterday was 120 psi across the board. Pulls the 4 speed with the middle OD ratio with no problems. Just have to retard it a couple of degrees when climbing hills.

10-27-2013, 03:28 PM	#1
johnsor Senior Member Join Date: May 2010 Location: Spooner, Wisconsin Posts: 242	Compression A few years ago, I installed a Brumfield H.C. Cylinder head. I never had the occasion to check the cylinders compression until yesterday. To my surprise, I measured 108 to 110 lbs. on all four cylinders. I performed the test twice with a quality gauge with the same results. I had a hard time keeping the gauge seated in the plug hole. No wonder this Model A Roadster is so peppy. Thanks L. Brumfield.

10-27-2013, 05:54 PM	#2
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: Compression What bore is your engine? I have a police head on mine with .060 overbore, compression 100# right across. Walt

10-28-2013, 10:21 AM	#3
bettlesr Senior Member Join Date: Nov 2010 Location: Florham Park, NJ Posts: 396	Re: Compression Sponsored Links (Register now to hide all advertisements) Mine has a .100 overbore and a 7:1 Winfield head. The compression when I checked yesterday was 120 psi across the board. Pulls the 4 speed with the middle OD ratio with no problems. Just have to retard it a couple of degrees when climbing hills. __________________ 1965 Lotus Elan S2 1930 Model A Sport Coupe