Cams for 318's

So of the above is too simplistic- here is some moe depth
I said that DC was 20 degrees longer than the Jones at .004 and 15 @.006
Jones takes 10 degrees to go .002 the DC 260 15 degrees to go .002
however those durations were for both the opening and closing ramps
so it used to be simple to just take half that amount for the opening and closing ramps for a symetrical cam
However modern cams are asymetrical
from the comp cams lobe catalog we are given the opening "Intensities" and closing "intensities" (see Harvey Crane's article linked above)
comp does not give intensities for the older series like the H
RPM 29.9 (13.3/15.6) .842
HE 25.7 (12.3/13.4 .842
XE 22.9 (11.1/11.8) .842

PP 24 (11.6/12.4) .904 (Purple Plus)
XM 23.1 (11.2/11.9) .904 (the HE HL Mopar grinds)
X4X4 23.5 (11.3/12.2) .904

so for those of you doing simulations just estimate the opening side/ ramp of the lobe to be a degree quicker than the closing side of the lobe (not for stock mopar cams where the closing is MUCH longer)


a big ending to the oft stated falicy that .904 lobes are more radical
the comp Chevy XE lobes of Harold Berkshire are quicker than any of the Mopar lobes .006<.050 or .050>.006