The Ford Barn

Partsfather · 09-26-2014, 03:05 AM

Have a model a ford head with MF1 cast in the top also dated 5 24 48. Any info?
Partsfather

CarlG · 09-26-2014, 09:34 AM

A picture of both sides of the head would be helpful.

Larry Seemann · 09-26-2014, 05:51 PM

MF stands for Michigan Foundry - a supplier of after market parts. The MF1 I think had a compression ratio of 5.5 or maybe 5.1. The MF2 had a ratio of 6.1 or 6.2. They were high compression heads but I don't remember the ratios exactly. Like the "police heads" they have the heart shaped combustion chamber.

Bob Bidonde · 09-27-2014, 09:03 AM

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With the head on a known good engine, take compression readings. Average all 4 readings and divide the average number by 14.7. The resulting number is an estimate of the compression ratio.

The compression ratio will be higher when the engine is running because there is a dynamic pressure not acting during the compression test. However, the cylinder head's compression ratio is determined with the engine not running.

09-26-2014, 03:05 AM	#1
Partsfather Junior Member Join Date: May 2014 Location: Wilkinson, IN Posts: 2	cast # on model a head Have a model a ford head with MF1 cast in the top also dated 5 24 48. Any info? Partsfather

09-26-2014, 09:34 AM	#2
CarlG Senior Member Join Date: Nov 2010 Location: Anchorage, Alaska Posts: 9,115	Re: cast # on model a head A picture of both sides of the head would be helpful. __________________ Alaskan A's Antique Auto Mushers of Alaska Model A Ford Club of America Model A Restorers Club Antique Automobile Club of America Mullins Owner's Club

09-26-2014, 05:51 PM	#3
Larry Seemann Senior Member Join Date: May 2010 Location: Spokane, WA. Posts: 496	Re: cast # on model a head MF stands for Michigan Foundry - a supplier of after market parts. The MF1 I think had a compression ratio of 5.5 or maybe 5.1. The MF2 had a ratio of 6.1 or 6.2. They were high compression heads but I don't remember the ratios exactly. Like the "police heads" they have the heart shaped combustion chamber. __________________ Larry Seemann

09-27-2014, 09:03 AM	#4
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,470	Re: cast # on model a head Sponsored Links (Register now to hide all advertisements) With the head on a known good engine, take compression readings. Average all 4 readings and divide the average number by 14.7. The resulting number is an estimate of the compression ratio. The compression ratio will be higher when the engine is running because there is a dynamic pressure not acting during the compression test. However, the cylinder head's compression ratio is determined with the engine not running. __________________ Bob Bidonde