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Posted by / 03-Aug-2017 00:56

SHARE THIS ARTICLE: Please feel free to share this post on Facebook / Twitter / Google or any automotive Forums or blogs you read.You can use the social sharing buttons to the left, or copy and paste the website link: https:// For the record, I’ve found that even among successful, professional, race-winning engine builders, real camshaft expertise is rare.This causes reduced cranking pressure and consider- ably less torque, especially at the low end.Fig 7-1 illustrates just how this lower cranking/low speed compression comes about.In order of importance they are: overlap, the lobe centerline angle (LCA), advance/retard setting, lift, and duration.

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To see how the factors of flow and displacement affect the cam spec required, let’s start with the seemingly disconnected issue of fuel octane.

Fuel octane influences the compression ratio that can be used and an engine’s CR must, for best results, be tied to cam duration.

For most engines, detonation occurs at low RPM because of the greater length of time the end gases are exposed to the advancing flame front.

When a long cam is used, the compression pressures at low RPM are reduced, thus not only allowing—but requiring—a higher CR to be used.

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Obviously the piston will be well up the bore if the valve closes late as per a long- duration cam.