Deflector Pistons:
Deflector pistons are utilized in two-stroke engines with crankcase compression, where the gas flow within the cylinder must be carefully directed so as to produce efficient scavenging. With cross scavenging, the transfer (inlet to the cylinder) and exhaust ports are on directly facing sides of the cylinder wall. To stop the incoming mixture from passing straight across from one port to the opposite, the piston features a raised rib on its crown. This can be intended to deflect the incoming mixture upwards, around the combustion chamber.
Much effort, and plenty of different designs of the piston crown, went into developing improved scavenging. The crowns developed from an easy rib to an oversized asymmetric bulge, usually with a steep face on the inlet side and a delicate curve on the exhaust. Despite this, cross scavenging was never as effective as hoped. Most engines today use Schnuerle porting instead. This places a pair of transfer ports within the sides of the cylinder and encourages gas flow to rotate around a vertical axis, instead of a horizontal axis. Read and learn about car Technical FAQ and get in-depth details of the car features.
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