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Old 01-05-2005, 11:58 AM
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Supercharger/Cylinder Pressure

Am I correct in assuming that relatively lower cylinder pressure is not necessarily a bad thing on supercharged engines? My cranking cylinder pressure is about 150-153 lbs on my 383/ B&M 144 combination. Normally, I'd like to see higher on a N/A motor, but I'm wondering if this could work to my advantage to help control the dreaded detonation under boost.

Also, I've read several (some conflicting) feelings on the benefit (or lack thereof) of going from 1:5 to 1:6 ratio rockers. My question has to do again with cylinder pressures. I'm running a dual grind Lunati (488/509 234/244) cam with 112 degree lobe separation, and 1:6's. Since the 1:6 change the cam duration slightly, could that be negatively affecting my cylinder pressures?

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Old 01-05-2005, 12:07 PM's Avatar
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The 1.6 rockers probably would not be a factor in cranking pressures and probably not that much improvement under boost. The 150-153 would be in the ball park for a blower engine on the street with that cam combo. The torque at mid-upper rpm should be awsome!!
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