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The flow of air into/out of the chamber is exactly what creates power. Remeber atmospheric air pressure is 14.7psi, and the cams make a diffrence, becuase the valve by design is always in the airflow. If at 24.7psi (atmosphere+boost) air goes in faster, and definetly has more behind it, but the valve is still in the way. It all comes down to VE.
When building a blown motor, the main concern (in a mild boosted situation) is the head gasket, its usually the weakest link. All too common, a engine will explode, throw a rod, etc, but more times than not, thats caused by the AF ratio, if it runs lean, it will pop. (Never ignore fuel when adding more air). the most solid engines run ringed heads (a small ring of metal around the top of the cyllinder that cuts into the soft aluminum head, hard to do in an open deck honda). Aside from that, check the rod bolts (they flex, and thats when you slip a bearing, covering the oil path, then it gets worse from there), the rods, and wristpin lands. But again, the forces to break those usually come from detonation.
Just my 2cts.
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10-22-2002, 01:21 PM
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