Emissions controls garner more hate than just about anything else in the automotive world. And this isn’t some fad hatred ...

Small, ultra-fast, primary and “afterburner” secondary combustion events promise to deliver brake thermal efficiency as high ...

The half-time shaft, powered by a belt from the crankshaft, slid and twisted the sleeve valves to align with the cylinder's intake and exhaust ports in-time with the four-stroke process.

There is also no need for a minimum of two valves (intake and exhaust) per cylinder as seen in a piston engine. Instead, fuel enters via intake ports that don't need to open and close. In a Wankel ...

Last month's "How It Works" story gave you the basics of the four-stroke cycle, describing the motion of the intake and exhaust valves in relation to the piston moving up and down in the cylinder.

As a vehicle's engine operates, the intake and exhaust valves open and close rapidly while the pistons move up and down in the cylinder. These mechanical actions require a constant supply of hot oil ...

A duo of valves, the intake and exhaust valves, control the passage of the air-fuel mixture and the expulsion of exhaust gases. The intake valve orchestrates the entry of the mixture during the intake ...

If you have a bit of valve overlap—when the exhaust valve opens and the intake valve closes—you can use that exhaust pulse to help pull more air into the cylinder. "That negative pressure wave ...

A cylinder head with three intake and two exhaust valves could bring benefits in volumetric efficiency—how much air and fuel an engine takes in on an intake stroke—compared with a traditional ...

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 ...

A minimum amount of oil flow is required for proper lubrication of the intake and exhaust valve stems and guides. Via the clearance between guide and valve stem, a small amount of oil will enter ...

I’m talking about installing aftermarket intake and exhaust systems ... as opposed to first getting regulated at a butterfly valve, like most cars this side of a Koenigsegg.