At its most basic level, an engine is an air pump. Internal combustion engines breathe fresh air and expel wasted exhaust gases to make power. Something has to tell those intake and exhaust valves ...

If you're into wrenching, you might have heard of roller and flat tappet cams, but what's the difference between the two, and ...

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.

More than a year ago, I purchased a new GM 350ci crate motor (PN 10067353). No oil gets to the rocker arms on the right-hand passenger side. There's plenty of oil on the driver side, and the ...

An internal combustion engine, at its core, is similar to a giant air pump. To produce power, it sucks in fresh air and fuel, compresses that mixture, and then explodes it, before expelling the burnt ...

Cummins is a trusted name in diesel engines. Its oil-burner motos run everything from Ram HD trucks to buses, generators, and heavy equipment. The 6.7-liter Cummins, in particular, built its name on ...

In the pre-LS era, a typical small-block-powered street car would rev willingly to around 5,000 rpm. You could assemble a cam package for it—even using heavy components—and you probably wouldn't have ...

This installment of Toyota's Engines 101 series takes a closer look at one of the most critical parts of an engine: its valvetrain. The video establishes what parts comprise a valvetrain, looks at ...

If there is one performance limitation to hydraulic roller lifters it is the maximum rpm capability they can maintain in race applications. The internal hydraulics of standard roller lifters are ...

There are certain engine technologies that seem to make a lot of sense, until you scratch beneath the surface just a little. Desmodromic valvetrains are one such technology. To be fair, this is more ...

Eaton’s valvetrain portfolio for diesel off-highway vehicles now features cylinder-deactivation (CDA) technology that allows for variable valve actuation with hydraulic lash adjustment (HLA) ...