Emd 8472778 Piston
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EMD piston 8472778
Deflector pistons are used in two-stroke engines with crankcase compression, where the gas flow within the cylinder must be carefully directed in order to provide efficient scavenging. With cross scavenging, the transfer (inlet to the cylinder) and exhaust ports are on directly facing sides of the cylinder wall. To prevent the incoming mixture passing straight across from one port to the other, the piston has a raised rib on its crown. This is intended to deflect the incoming mixture upwards, around the combustion chamber.
Much effort, and many different designs of piston crown, went into developing improved scavenging. The crowns developed from a simple rib to a large asymmetric bulge, usually with a steep face on the inlet side and a gentle 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 in the sides of the cylinder and encourages gas flow to rotate around a vertical axis, rather than a horizontal axis.
EMD diesel engines have a long history. With the wide application of EMD in train traction, we provide various reliable accessory support for the maintenance of EMD diesel engines. The EMD parts we produce not only include EMD piston 8472778, but also cylinder heads, cylinders, piston rings, etc. Welcome to contact us for more information about diesel engine parts, please contact us.