Compression test kits do just what they say: measure the ability of each cylinder of your engine to combust the fuel/air mixture without losing any of the resulting energy.

Unique compression technology and an improved ratio of fuel economy to performance made the Skyactiv-X engine promising, but the U.S. never received it.

It works like this: The engine makes hydrogen from gasoline using its own heat and a catalyst. It then burns that hydrogen ...

Avinash Kumar Agarwal, Vishnu Singh Solanki, M. Krishnamoorthi, Experimental Evaluation of Pilot and Main Injection Strategies on Gasoline Compression Ignition Engine—Part 2, SAE International Journal ...