GM has filed a patent application a variable displacement valvetrain system with rocker shaft porting and insert sleeves for ...

The rocker arm employs the use of a fulcrum or pivot to increase the cam lift by a given ratio. That increase in lift is the result of moving the pushrod pivot point closer to the fulcrum. That ...

The debate over the optimum rocker arm ratio to use has dragged on probably since the invention of the pushrod V-8. Even though Chevrolet made the decision easy for us when it engineered the original ...

Overhead cams are a more efficient method of actuating the valves than with a pushrod, but someone in Detroit never got the memo. And thank goodness they didn't. With production pushrod mills turning ...

A push rod is a connecting link in an operating mechanism. Two examples are the rod between the valve lifter and rocker arm on an overhead valve engine, and push rods at the piston ends which apply ...

There have been many engine designs over the years, from sleeve valve to Rotary, but only two designs have endured; pushrod engines and overhead camshaft engines. *Billed as $4 plus GST every four ...

Motorcycle.com spotted the patent that was filed in February but only recently published shows definitively that Harley had a new pushrod engine in the works. According to the patent, the company is ...

THERE have been many engine designs over the years, from K-Cycle to Rotary, but two designs have endured; pushrod engines and overhead camshaft engines. There are advantages and disadvantages of both ...

Pushrods convert the vertical motion of the lifter from the camshaft lobe into valve movement. A V8 engine takes advantage of that by centrally locating a single camshaft in the middle of the engine ...