Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

"I want big power," was the comment from Editor Smitty to Mike Dezotell and myself during a brainstorming meeting last month. The power he was referring to is the little supercharged Two-Valve bullet ...

Combustion chambers have come a long way since these old "real" Pontiac V-8 open-chamber heads, circa 1968 and later. Notice there is no designed-in swirl or mixture motion whatsoever, just the first ...

Our mechanic takes us through the cylinder head and valve train and continues his explanation of how engines really work. The Mechanic is the kind of chap who eat, sleeps and breathes engineering.

The 'Intelligent Valve Actuation ( IVA)' system that operates the intake and exhaust valves that are arguably installed in gasoline and diesel engines with only the power of an electric motor is a ...

Cut valvetrain weight and scream past redline. PBM's titanium valves for Chevy and Ford heads stabilize high-revving race ...

GALESBURG, Mich.--(BUSINESS WIRE)--Power management company Eaton today announced its Vehicle Group has introduced its next-generation sodium-filled hollow-head valves, which improve fuel economy, ...

New cylinder head designs are not something you see everyday. Even when something new does come out, it's normally adapted from something else, be it a race head or a more exotic engine. The trickle ...

Porsche never made a four-valve head for an air-cooled 911. The 959 had 24 valves, but its heads were water-cooled. It wasn't until the first water-cooled 911, the 996, arrived in 1998 that the iconic ...

I’m not sure if any engine built today will still be salvageable 100 years from now. Not to sound like a grump, but so much relies on computers that will surely be obsolete by then. And let’s not get ...