Opposed-piston engine – Knowledge and References

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Internal Combustion Engines

Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017

Don M. Pirro, Martin Webster, Ekkehard Daschner

Crosshead-type engines are also built with double-acting pistons, or with two pistons acting in opposite directions in the same cylinder—this configuration is called an opposed piston engine. One of the chief disadvantages of crosshead construction is that it results in an engine that has a greater overall height than a trunk piston engine of the same horsepower. However, most engines with bores larger than 600 mm (24 in) are of the crosshead type.

Impact of ethanol, methyl tert-butyl ether and a gasoline–ethanol blend on the performance characteristics and hydrocarbon emissions of an opposed-piston engine

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Journal Information

Published in Biofuels, 2020

Ahmet Alper Yontar

The torque curves have convex exponential shapes. Up to peak torque value, the rising amount of air–fuel intake with increasing speed raised the torque, and all types of frictional losses as well. The bi-directional movement piston behavior in the opposed-piston engine cylinder caused the losses to increase rapidly. The highest torque value was obtained using ethanol. In ethanol usage, the torque reached its maximum value (∼125 Nm) at approximately 2000 rpm. Similar behaviors were observed for gasoline, MTBE and E85. The torque reached the maximum point (∼119 Nm) at 2000 rpm for gasoline. At MTBE, the torque curve trend is higher than that of gasoline and E85, reaching the maximum point (∼124 Nm) at 2000 rpm.