4.7 Camshaft specs
Champion
Joined: Aug 2005
Posts: 3,313
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RE: 4.7 Camshaft specs
from E-booger's article about the 4.7 v8
The camshafts themselves are radical - although not in lift or duration. These are truck engines, after all: 0.443" lift on the intake, and 0.429" on the exhaust, duration is 244 degrees intake, 254 on the exhaust, partially compensating for the smallish exhaust valves. Overlap is only 18 degrees. This is an emissions, and torquer motor, remember. What makes the cams radical isn't the timing, but the construction. They are hollow steel tubes with the individual lobes, of powdered metal, sinter-bonded in place. In fact, the cams, being hollow, are used to bring oil to the intake lobes, which have oiling holes. Cam (valve) covers are cast magnesium.
The camshafts themselves are radical - although not in lift or duration. These are truck engines, after all: 0.443" lift on the intake, and 0.429" on the exhaust, duration is 244 degrees intake, 254 on the exhaust, partially compensating for the smallish exhaust valves. Overlap is only 18 degrees. This is an emissions, and torquer motor, remember. What makes the cams radical isn't the timing, but the construction. They are hollow steel tubes with the individual lobes, of powdered metal, sinter-bonded in place. In fact, the cams, being hollow, are used to bring oil to the intake lobes, which have oiling holes. Cam (valve) covers are cast magnesium.
