Download a copy of our Static and Corrected Compression Ratio Calculator to help decide how much compression you need with a specific set of cams. Likewise a low compression ratio with late intake close timing will sap power, especially on A high compression ratio with early intake close timing is a recipe for detonation.
One other note on intake close timing: the later you close it, the higher compression ratio you need, since no compression takes place until the valve Race grinds tend to close it anywhere from 55 to 70 degrees ABDC. Street grinds typically close the intake valve anywhere from 35 to 55 degrees after bottom dead center (ABDC) Since these motors don't have variable valve timing, you have to pickĪn intake close timing event based on the rpm that matters most to you. Turns higher and higher rpm's, ideally you'd like to move the intake close timing out farther and farther. But the amount of time the cylinder fills stays pretty constant regardless of the rpm of the engine. Little while even after the piston has started coming up. This is done to maximize cylinder fill, as the incoming fuel has inertia and the cylinder continues to fill for a Up on the compression stroke before the intake valve closes. What happens is that the piston is well on it's way The first spec to look at when selecting your cams is the intake close timing. We're proud to offer on this page the grinds that we've had the best success with, and that Used literally every XL cam available at one time or another. At HAMMER PERFORMANCE we have many years experience building XL engines and we've
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