Reply to "Dyno Testing Update - This time with data points"

> Very interesting. What kind of cam was used in the test?

The camshaft is from Reed Cams in Georgia and is a custom hydraulic roller,
specifically part number 535-TM280HR-284HR-107A, and is ground on a standard
base circle steel core. In picking the cam specs, we were after a street
performance grind that would have a horsepower peak near 6000 RPM with a best
shift point of 6500 RPM, a wide mid-range torque band and some idle rump-rump.
We also wanted a cam that would work well with all the heads to be tested
which range from open chamber 2V iron to Ford Motorsport aluminum high ports
to CHI 3V's. We chose a hydraulic roller to avoid the lobe and lifter wear
problems associated with the low ZDDP content associated with current
automotive oils. Also, I'm a lazy street guy and setting lash on a solid
cam is a bit of a chore in a Pantera. The cam specs are:

228/232 degrees @ 0.050" lift (280/284 @ 0.006"), 0.588"/0.588" lift,
107 LSA, 68 degrees overlap, installed in the engine on a 104 intake
centerline.

The 68 degrees of overlap should put us in the right ballpark for a
street performance cam in an engine of 351 cubic inches, considering
our relatively large intake valves. I picked the lobe separation angle
using David Vizard's cam selection guidelines. Theoretically, for this
combination of bore, stroke, intake valve diameter, compression ratio
and overlap, this LSA should give us the best area under the HP curve
(not necessarily the best peak HP). For our valve diameters, Vizard's
guidelines suggest very large lift (between 0.615" to 0.766") with the
caveat that lift be limited to whatever is consistent with the longevity
goals. Since our goal was a street engine, we went with a relatively
modest lift of 0.588".

Dan Jones