HOT ROD’s archives are chock-full of brilliant tech reports that truly are timeless. This one, drafted by Jim McFarland for our February 1972 issue, provides an extensive look at how important airflow ...

Engineers have a lot to think about when designing new engines, and one of the biggest considerations is the shape of the ...

By combining advanced seat and seal concepts with durable materials and quality manufacturing, subsea valves can maintain ...

How do you know when to choose diaphragm vs. piston flushometer valve technology? Sloan has issued a new white paper that discusses the differences between diaphragm and piston valve flushing ...

What you are about to read is considered by some professional people to be "black art" … at least in part. Although upheld by considerable mathematical and qualitative analyses, much of what is known ...

Let’s say that you’re assembling your next street engine only to discover that the piston-to-valve clearance on the intake side is a little too close for your liking. You could add a thicker head ...

The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ruckus while doing it. Mechanical lifters were adequate for valve operation ...