Two-stroke? Forced induction? Compression-ignition-capable? That is many unexpected engine technologies combined into a single engine.

A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ability to hold pressure.

In a two-cycle engine, the valving is designed to take advantage of both the up and down stroke of the motor to push exhaust and fresh air through the combustion chamber.

This two-stroke design implements the same idea, aiming to run in compression-ignition mode for efficiency while switching over to spark ignition under higher engine loads.

Delivering a powerful punch each and every turn of the crank. Read the full story on the two-stroke engine's expected revival, at Automobile Magazine online.