The Ford Barn - Compression

The Ford Barn (https://www.fordbarn.com/forum/index.php)

- Model A (1928-31) (https://www.fordbarn.com/forum/forumdisplay.php?f=3)

- - Compression (https://www.fordbarn.com/forum/showthread.php?t=300438)

Nick in Fayetteville

06-26-2021 06:36 PM

Compression

What is the compression ratio on the Model A "B" head. This is the police head. Some say 5.0 to 1, others tell me that it is 5.5 to 1. What's your thoughts. Thank you.

Patrick L.

06-26-2021 08:14 PM

Re: Compression

I believe the standard 'A' is 4.2 and the 'B' or police head is 4.8.

If I'm wrong we'll know soon enough. [ smiley face]

Doug Linden

06-26-2021 08:57 PM

Re: Compression

Model A "B" Police head has CR of 5.2

Chuck Sea/Tac

06-26-2021 11:39 PM

Re: Compression

5.2 is correct. I’m guessing 65# most important is they’re within 5# or so of each other.

Patrick L.

06-27-2021 12:40 PM

Re: Compression

http://www.fordgarage.com/pages/head...ssionratio.htm

Nick in Fayetteville

06-27-2021 01:36 PM

Re: Compression

Thanks Guys, I researched more and found that 5.2 is correct. Thanks for your help. Have a happy "A" day.....Nick

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