The Ford Barn

ratamahata · 07-04-2011, 12:00 PM

Recently I purchased a model A engine with the prefix AF, searching in the web I found some information in the text below... from the Ford Garage web page, I'm curious about the engine bore... Why Ford produced engines with a small bore and a large bore? What engine have more HP?

For example, engine number 1234567☆ was produced at the Rouge and might have had a prefix of ☆A, ☆AA, ☆AF, or ☆AAF depending on whether it was for a car or truck (clutch), and whether it was for a large bore engine for the US, a small bore engine assembly for export, or a RHD engine and transmission assembly produced at the Rouge for export to a RHD non-British Empire country, such as some South American countries at the time.
Non Rouge-built:
Small bore engines produced in England (RHD) used numbers from assigned number groups granted by the Rouge to the foreign engine plants, however the 'F' in the prefix was only used to indicate the small bore engine. Large bore engines did not carry the 'F' in the prefix.

For example, engine number 700001☆ was in a group of numbers which was assigned to Ford's engine production operation in Manchester, England for their use, and may have ultimately had a prefix of ☆A or ☆AA depending on whether it was destined for a car or truck. It may also have had an 'F' at the end of the prefix (i.e. ☆AF) to indicate if it was a small bore engine.

07-04-2011, 12:00 PM	#1
ratamahata Senior Member Join Date: Nov 2010 Location: Argentina Posts: 710	Engine AF small Bore vs Large Bore Recently I purchased a model A engine with the prefix AF, searching in the web I found some information in the text below... from the Ford Garage web page, I'm curious about the engine bore... Why Ford produced engines with a small bore and a large bore? What engine have more HP? For example, engine number 1234567☆ was produced at the Rouge and might have had a prefix of ☆A, ☆AA, ☆AF, or ☆AAF depending on whether it was for a car or truck (clutch), and whether it was for a large bore engine for the US, a small bore engine assembly for export, or a RHD engine and transmission assembly produced at the Rouge for export to a RHD non-British Empire country, such as some South American countries at the time. Non Rouge-built: Small bore engines produced in England (RHD) used numbers from assigned number groups granted by the Rouge to the foreign engine plants, however the 'F' in the prefix was only used to indicate the small bore engine. Large bore engines did not carry the 'F' in the prefix. For example, engine number 700001☆ was in a group of numbers which was assigned to Ford's engine production operation in Manchester, England for their use, and may have ultimately had a prefix of ☆A or ☆AA depending on whether it was destined for a car or truck. It may also have had an 'F' at the end of the prefix (i.e. ☆AF) to indicate if it was a small bore engine.