Follow this link to learn more about Ground-In Advance How does it affect performance?Īdvancing or retarding the cam will move the Torque curve higher or lower in the rpm range. Its all due to actual timing flutter or 'scatter' caused by the oil pump shaft pulses, clearances in the original cam gear, and dizzy shims, and even slight fluctuations in your timing light itself. Some camshafts are designed with "ground-in" advance. And yes, the timing mark jumps around a bit on the timing light.
If different than the listed value, the cam is either advanced or retarded.Compare the centerline to the value listed on the Cam Card.awhtx is right, in the 60s Ford used a composite aluminum/nylon gear to reduce timing chain noise. With the advent of digital controls for milling machines, billet is often a cheaper alternative. Follow this link for the process to Degree the Camshaft. Since Ford dropped the composite crap, the typical timing gear is a machined forged cam gear with sintered crank gear.NOTICE The WT gear bolts may interfere with the Figure 9. Tie the timing chain to ensure it stays properly aligned with the exhaust and crankshaft timing gear pulleys. This should be done when building an engine or replacing a camshaft. Remove the W T gear from the cam housing.This is known as "degreeing the camshaft.".
Find the lobe centerline in relation to the piston's position in the cylinder.This changes the Timing of the valve opening and closing events, in relation to the position of the piston in the cylinder. Advancing or retarding the cam pushes the centerline of the camshaft to one side or the other of the crankshaft centerline. When a cam is installed "straight-up," the imaginary centerlines of the two shafts line up exactly. To advance or retard a camshaft is to change the alignment between the camshaft and the crankshaft.
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