Chevy Small Block Cam - Separation Of Power

Does Lobe Separation Really Matter?

Mike Petralia Feb 1, 2002 0 Comment(s)

This proves that the entire package is very important to consider when choosing the correct camshaft, and in most cases you'd be wise to consult an expert, not your buddies unless they're also cam experts, when selecting the perfect cam. As we learned in our tests, any cam can work well, but some cams can work better than others.

Separating the Power
Look closely at the two power curves for all cams. Note how the 106 and 110 lobes practically duplicate each other. Comp explained that since the engine we tested used a single-plane intake manifold and open headers, it breathed well and didn't need much help scavenging the cylinders. The 106 cam probably over-scavenged just a bit too much, and the 110 probably under-scavenged an equal amount, so the dyno pulls look almost identical.

Since the 108 lobe performed best, it showed that this engine liked only a little scavenging, and the 112 and 114 lobes' poor performance meant the this engine liked to breathe with a little bit more overlap to make the best power. The average and maximum power figures tell the biggest story. One true benefit to running a higher-lobe-separation cam is a better idle quality with more vacuum, so we listed vacuum at 1,000 rpm for each cam to compare. These results represent horsepower averaged from three consecutive dyno pulls with each cam.

Sources

Westech Performance Group
Mira Loma, CA
951-685-4767
WestechPerformance.com
Crane Cams
Daytona Beach, FL 32117
866-388-5120
http://www.cranecams.com
Comp Cams
Memphis, TN 38118
800-999-0853
http://www.compcams.com
Crower Cams
San Diego, CA 92154
619-661-6477
http://www.crower.com
Erson Cams
Carson City, NV 89706
800-753-2386
pbm-erson
Iskenderian Racing Cams
Gardena, CA 90247-9990
Jesel Inc.
Lakewood, NJ 08701

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