Piston Engine Testbed

This model shows the effect of varying the number of cylinders in a piston engine. Four, six, and eight cylinder engines are included with firing offsets evenly distributed about their four-stroke cycles. Piston pressures are normalized by the number of cylinders to emphasize the effect on output vibration.

Model

Simulation Results from Simscape Logging

The plots below show engine speeds and cylinder torques for 4, 6, and 8 cylinder engines. All engines are acting against the same viscous friction load. The sum of torques produced by all cylinders in each engine is also plotted to illustrate the effect of more cylinders on engine torque.