Manton – Series 3 Pushrods, 5/16″ Diameter, 0.083″ Wall Thickness

Why 3 Pieces?

Each end of a pushrod must be compatible with the mating components’ specific material, heat treatment, and surface preparations. This requires the use of materials that function as a bearing material and an impact surface. As an added benefit, the center section of the pushrod becomes dramatically stronger by reducing the length of the tube.

A three piece pushrod allows us the flexibility to create unique tapers for any clearance issues. Another benefit is the ability to create any wall thickness, diameter, or harmonic frequency required (frequency can predetermine valvetrain surge points).

The column of a pushrod MUST be made out of a different material and heat treated differently than its tips. This provides the strength necessary to withstand the combined abuse of high engine speed and cylinder pressure. By using dissimilar materials from the pushrod end, we are not limited to a simple carburize and case procedure used when making a single piece pushrod. However, our custom blend of chromoly steel tubing can be heat treated to provide the specific attributes required to increase the service life and performance. In our series 2 and 4, we impregnate carbon into the surface of the tubing after heat treatment. This provides durability and wear resistance for guide plate use. For our series 5, we use a multi stage proprietary heat treating process to increase the material value to a Rockwell of approximately 46 “C” to the core. This is critical to the performance and durability of a pushrod. We also offer a proprietary tool steel material that can be heat treated to PSI material values higher than any custom blend chromoly. It is very impact resistant and is the perfect material for the most extreme applications.

In our professional experience, the only reason to produce a one piece pushrod would be to cut the cost of manufacturing.