At the moment the exhaust valves or ports begin to open, roughly 100 psi is all that’s left of combustion pressure. Can’t we go on expanding that gas with the piston to get all its energy?

This video covers the installation and operation of the Awron exhaust valve controller on a BMW G8X M3/M4. The system allows ...

04 Katech’s valvetrain test involved comparing the stability of replacement valves vs. the stock LS7 exhaust valves, as well as the stability of popular camshaft and spring upgrades.

This muffler, the invention of Mr. Thomas E. Hill, of Rahwl-.v, N. J., is for deadening or preventing the unpleasant hissing sound of escaping steam from the valves of steam engines.

Trouble with the exhaust-valves of the Type-J aircooled cylinder caused an investigation to be made of valve-cooling and of valve and guide wear. A temperature of 1300 deg. fahr, invariably caused ...