Basics
(Created page with ' With any fuel you run, the cylinder pressure that the motor generates is limited by the anti-detonation qualities of the fuel. I speak almost every day on one thread or anothe…') |
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In Crane Cams literature, they explain that the limit of cylinder pressure when using pump gas is somewhere around 165 psi, but I have witnessed fellows running over 200 psi on pump gas. You just have to make sure everything in the chamber is smooth, with no sharp edges that could glow red and touch off a round of pre-ignition. You also would not use PCV or EGR with such a motor. Goes without saying that the ignition timing must be spot on. It is my opinion that a tight squish (0.035" to 0.045") will allow higher pressures also. As the piston comes up to mate with the underside of the head, the mixture in that space is compressed and blown across the chamber. This eliminates dead or lazy spots in the chamber and homogenizes the entire mixture, giving it a much better chance of burning completely and making max power from the combination without detonation. The tighter the squish, the lesser grade of fuel you can run. | In Crane Cams literature, they explain that the limit of cylinder pressure when using pump gas is somewhere around 165 psi, but I have witnessed fellows running over 200 psi on pump gas. You just have to make sure everything in the chamber is smooth, with no sharp edges that could glow red and touch off a round of pre-ignition. You also would not use PCV or EGR with such a motor. Goes without saying that the ignition timing must be spot on. It is my opinion that a tight squish (0.035" to 0.045") will allow higher pressures also. As the piston comes up to mate with the underside of the head, the mixture in that space is compressed and blown across the chamber. This eliminates dead or lazy spots in the chamber and homogenizes the entire mixture, giving it a much better chance of burning completely and making max power from the combination without detonation. The tighter the squish, the lesser grade of fuel you can run. | ||
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