The Ford Barn

Mike V. Florida · 06-12-2010, 02:15 AM

What ratio is your high compression head? You can select more than one.

MikeK · 06-12-2010, 08:10 AM

This is one of my blueprinted Super Brumfield heads with 117cc chambers.
The 'Super' differs from the regular Brumfield heads. Lowered plug seats, necessitated by the shallow chambers, are recessed rather than spotfaced flush with the top of the head.
Cranking compression with a Stipe 340 cam is 160psi. Vroooomm ! !

V4F · 06-12-2010, 08:44 AM

so is that a 9:1 ?? .............. steve

Blessyouboys · 06-12-2010, 08:48 AM

Quote:

Originally Posted by Mike V. Florida

What ratio is your high compression head?

If this poll is for high compression heads, why is stock compression ratio an option?

Purdy Swoft · 06-20-2010, 12:40 PM

I am running 5.9 and I am happy!!!

Terry, NJ · 06-20-2010, 08:28 PM

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Wow! An 11 to 1 comp ratio on a Mod A. Well a little less! 14.7 lbs atmospheric pressure (14.7 X10= 147 lbs, 14.7 X11 would be 161.7) This is given the 100% of volumetric efficiency at cranking speed. WoW that's some head! Pretty to look at too!
Terry

Quote:

Originally Posted by MikeK

This is one of my blueprinted Super Brumfield heads with 117cc chambers.
The 'Super' differs from the regular Brumfield heads. Lowered plug seats, necessitated by the shallow chambers, are recessed rather than spotfaced flush with the top of the head.
Cranking compression with a Stipe 340 cam is 160psi. Vroooomm ! !

View Poll Results: What is the ration of your head.
Stock 4.2:1	10	20.00%
Between 4.2:1 and 5:1	0	0%
Between 5:1 and 5.5:1	10	20.00%
Between 5.5:1 and 5.9:1	21	42.00%
Between 6:1 and 6.9:1	6	12.00%
Between 7:1 and 8:1	7	14.00%
Higher	2	4.00%
Don't know but it's not stock	2	4.00%
Multiple Choice Poll. Voters: 50. You may not vote on this poll

06-12-2010, 02:15 AM	#1
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Head Compression ratios What ratio is your high compression head? You can select more than one. __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

06-12-2010, 08:10 AM	#2
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Super Brumfield Head This is one of my blueprinted *Super Brumfield* heads with 117cc chambers. The 'Super' differs from the regular Brumfield heads. Lowered plug seats, necessitated by the shallow chambers, are recessed rather than spotfaced flush with the top of the head. Cranking compression with a Stipe 340 cam is 160psi. *Vroooomm ! !*

06-12-2010, 08:44 AM	#3
V4F Senior Member Join Date: May 2010 Location: ca. Posts: 2,522	Re: Super Brumfield Head so is that a 9:1 ?? .............. steve __________________ V4f

06-20-2010, 12:40 PM	#5
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Head Compression ratios I am running 5.9 and I am happy!!!