Posted by Ken(Ark) on October 14, 2012 at 16:41:53 from (71.30.143.205):
In Reply to: cam lobe height posted by boler76 on October 13, 2012 at 13:09:48:
Quoting Removed, click Modern View to see
Just adding info .
Ford Flathead Cam Lobe Designs
TThe Ford Flathead engine used various cam designs. Among these were the Model T cam, Model A/B cams, and the V-8 cams. Camshaft performance was usually described in terms of a number of terminologies in relation to the timing of the valve movements. These include the Top Dead Center (TDC), Bottom Dead Center (BDC), Before Top Dead Center (BTDC), After Top Dead Center (ATDC), Before Bottom Dead Center (BBDC), and After Bottom Dead Center (ABDC).
Model T and Models A/B Cams Specifications
The Model T cam BTDC, ABDC, BBDC, and ATDC were -12, 52, 39 degrees and one degree. Its duration was 220 degrees for both the intake and exhaust. The Lift was 0.250 inches and the Lobe Separation was 115.5 degrees. Model A/B cams BTDC, ABDC, BBDC, and ATDC were 8, 56, 56, and degrees. The duration was longer than that of the Model T cam at 244 degrees. The Lift was also higher at .334 inches during intake and 0.341 inches during exhaust. Lobe Separation was 114.0 degrees.
Flathead V-8 Cams
The Flathead V-8 camshafts came in four versions from 1937 up to 1952. These were the 78-6250 cams from 1937-1948, 8Ba-6250 cams from 1949-1951, 8CM cams from 1949-1950, and the 7HA cams from 1946-1952.
The 78-6250 cams BTDC, ABDC, BBDC, and ATDC were 0, 44, 48, and 6 degrees. It was 5, 44, 48, and 3 degrees for the 8BA-6250 cam, 10, 50, 50, and 10 degrees for the 8CM cam, and 11, 41, 48, and 10 degrees for the 7HA cam. The duration was 224 degrees for the 78-6250, 229 degrees for the 8BA-6250, 240 degrees for the 8CM, and 22 degrees for the 7HA. The 78-6250 and 8BA-6250 had Lifts of 0.307 inches. The 8CM's Lift was .338 inches, while the 7HA measured 0.350 inches. The Lobe Separation for the models ranged from 107.0 degrees for the 7HA up to 111.5 degrees for the 78-6250 cam.
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