Intake valves open and close to let the air-fuel mixture (or just air in some modern engines) enter the cylinders, and the exhaust valves allow exhaust gases to escape. Too much or too little ...

"Some believe having a double spring makes them safer, because if the main ... the exhaust valves, the stock ones were compared with heavier single-piece, stainless valves from Racing Engine ...

The Cummins engine is well-known due to its power and reliability, but when did it start using an EGR? Here's what it is and what exactly it does.

On engines with the intake and exhaust cam lobes ground on the ... See All 11 Photos The Viper's main oil control valve is combined with the solenoid and mounts to the top of the block.

The positive crankcase ventilation valve releases exhaust gas and unburned fuel from the engine block into the intake manifold. All engines allow some exhaust gases, unburned fuel and oil to ...

Bypassing the turbo at startup heats the main catalyst quickly ... scavenging of residual exhaust. As installed on a Chinese Qoros 1.6-liter 16-valve I-4 engine, the Freevalve system lowers ...

and exhaust. Combustion pushes the pistons down from the top of the cylinder. As engines need air to burn fuel, during intake, valves open up and allow ambient air to come in. When the piston reaches ...