Quote:
Originally Posted by rwd4evr
what do you mean 179 vs 190 degree? they aren't 179/190 degree duration of crank rotation are they? duration at 0.050"?
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Sit down - pour yourself a stiff drink!!
Mother Benz's duration specs are given at a valve lift of 2mm. That lift at the valve corresponds to approximately .050" at the lobe.
And no, Virginia, there is no camshaft Santa Claus such as many folks imagine as being the chief engineer of CompCams, Isky, Howard, etc.
Published duration numbers from The Mother are decidedly short by comparison with familiar US data; the longest street use, production profile is on the order of 204 deg @ 2mm lift.