You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC.

They stop lubricant back-flow through the control valve on the exhaust cycle that lets progressive oil flow to the cylinder, and have a full-formed seating-surface. The valves are available in a ...

The opening intake valve brings in a torrent of fresh air that helps expel the existing exhaust gases and creates a vacuum, allowing more fresh air to be drawn in.

Our mechanic takes us through the cylinder head and valve train and continues his explanation of how engines really work.

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 ...

It's going to make more power than the Four-Valve. Remember-when you bend air, it slows down. Ford straightened out that intake port, and it's a straight shot out the exhaust.

The valves pressurize and exhaust one outlet port to control a single-acting cylinder, or pilot another valve. Three-way valves direct pressurized air to the cap-end side of the cylinder.

Engine Compression Atmospheric pressure at sea level is approximately 14.7 psi. A 9:1 compression ratio cylinder is compressing the air and fuel mixture to about 132 psi at sea level (9x14.7=132.3 ...

As the exhaust gases pass from the cylinders in the engine through the muffler to the tailpipe at the rear of the vehicle and into the air, emissions control devices — including the PCV valve ...

Servicing Cessna 172 Stuck Exhaust Valves A rough-running engine means it’s time to pop valve covers.