Re: Ford Tractor Specifications 1939-1962
That's really handy, especially the engine/trans combos in the NAA series. That's where the line up gets complicated. The only discrepancy I noticed was the engine size and PTO rating. According to the Ford 9N/2N Service manual, the engine size is 119.7 cubic inches. The horsepower rating was23.87 (maximum belt) and the "rated belt" is 20.29 (85% of maximum). The maximum drawbar rating was 16.90 (without the 3 point hitch) and the rated drawbar hp was 12.68 (75% of maximum).
The 8N should also be 119.7 cubes, since it used the same bore and stroke, but it used a higher compression ratio for slightly higher hp.
The manual also lists the PTO as "509 rpm at an engine speed of 1400 rpm" and a shaft size of one and one eighth inches.
Anyway, thanks for putting all that together. The tractor lineup was simple until Ford discovered that one size really didn't fit everyone after all.