PACCAR has patented a method for starting a vehicle’s engine that involves rotating the crankshaft while keeping the exhaust valves of the combustion chambers open before fuel injection. The engine ...

The dual-mode exhaust system features electronically-controlled valves that can be in one of two positions: opened and closed. When the valves are closed, exhaust gasses are carried via their typical ...

This story was originally published on cycleworld.com. Few elements have as large an impact on a motorcycle’s design as the exhaust system. From header to exit, the gently curving shapes help define ...

You didn't think a company as advanced as Porsche would stop at a loud mode and a quiet mode, did you? Of course there's much more than that. Beyond simply opening the exhaust valves, the patent ...