We answer your questions in the Pit Stop. This month, we're answering John Lancara's question regarding piston-to-valve-clearance. Check it out here on HotRod.com or in the March 2013 issue of Hot ...

As an example, on a steel connecting rod engine with a piston-to-head clearance of 0.035 inch, the minimum P-V clearance for either the intake or exhaust valve could be 0.045-inch.

The inlet and exhaust valve timing of a piston engine plays a large role in engine performance. Many modern automotive engines have some sort of variable valve timing, but the valves are still mech… ...

A simple slide valve is used, allowing steam to flow to one side of the piston and the other alternately, as driven by an arm coming off the flywheel attached to the engine’s output shaft.

Alvarez agrees: "When people buy parts and install them at home, checking piston-to-valve clearance is critical. But most people don't know that." So now you know.

Signs That You Need Valve Clearance Adjustment As the valves are within your engine, all the symptoms will be connected with it. As such, you may experience the following: Cluttering noises. The ...

As the engine heats up, the spring inside the thermostat expands and pulls the valve open. Electric chokes use the vehicle's 12-volt power to control the thermostat.