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Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability. Ports can be modified for maximum power, minimum fuel consumption, or a ...
Die grinders are often used for engraving, cylinder head porting, and general shaping of a part. [1] Die grinders typically rotate at a high speed, typically 25,000 rpm. This is much faster than most cutting tools. As such, one must use accessories rated for such a high rpm to avoid the tool shattering.
A flow bench is one of the primary tools of high performance engine builders, and porting cylinder heads would be strictly hit or miss without it. A flow bench consists of an air pump of some sort, a metering element, pressure and temperature measuring instruments such as manometers, and various controls. The test piece is attached in series ...
This brings with it the problem that the exhaust ports have a tighter turn radius. This problem is somewhat offset by the larger port. Another popular solution, as used in the BMC A-Series and Holden 6-cylinder engines is the siamesed port. In this configuration one large port feeds 2 adjacent cylinders. The gain in area comes from effectively ...
A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.
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