The Humphrey pump could operate with either a four-stroke or two-stroke cycle.

A two-stroke cycle was also possible, if adequate scavenging could be achieved.

With the addition of a supercharger or turbocharger, opposed-piston designs can make efficient two-stroke cycle Diesel engines.

They are two-stroke cycle and generally carbureted.

These typically run on a two-stroke cycle, but are radically different from glow two-stroke engines.

The thermodynamic analysis of the actual four-stroke or two-stroke cycles is not a simple task.

Now that you understand the two-stroke cycle you can see why.

Other engine types such as diesel, or two-stroke cycle can differ in the exact implementation, but the general theme still applies.

The simplest glow-engines operate on the two-stroke cycle.

Petrol engines may run on the four-stroke cycle or the two-stroke cycle.