Connect with us

Hi, what are you looking for?


Diamond Introduces New SBC Sportsman Racing Pistons

Diamond Pistons Diamond_logohas introduced center-of-gravity balancing to Sportsman racing pistons, broken new ground in weight reduction and announced a new 380-gram series for small-block Chevrolet drag racing engines.

In addition to useful weight reductions, achieved mostly through the formation of clever ultra-light cross sections, Diamond’s new center-of-gravity balancing program ensures the piston travels squarely in its bore. Further, it exploits the latest 0.7mm piston rings to their fullest potential.

Though the pistons can be hard anodized (inside and out) with a molybdenum coating added to their skirts, they are available uncoated or with a moly coating applied directly to the bare aluminum skirts.

Diamond Piston-top-and-bottomLRTwin oiling holes are installed in the upper regions of the pin bores. The holes are connected by oiling channels and the pressurized oil supply is delivered from the oil control ring grooves. As the oil control ring wipes up and down the cylinder wall it diverts the accumulated oil not only to the crankcase but also force-feeds the pin oilers via drain-back holes positioned behind the oil control rings.

Curiously the pressure balance groove, placed between the top and second ring lands, is larger than customary and not the conventional V-shape but instead resembles the profile of a human nose. Pressure balance grooves or accumulator grooves are created to provide a reservoir to collect residual gases that penetrate beyond the top ring during the combustion stroke. The chief purpose of the groove is to relieve pressure between the rings, eliminate top ring flutter, and maintain ring seal.

To withstand racing pressures the pistons are provided with Trend’s latest TP1 tool steel piston pins. Originally tested in NHRA Top Fuel engines, the TP1 has the hardness of M2 tool steel and the toughness of the best maraging steels. Of particular interest these smooth, shiny finished pins are perfectly round.

Lastly, weighing just 380 grams Diamond believes they have invested these new domed pistons with both lightness and strength.

For more information contact:
Diamond Pistons
23003 Diamond Drive,
Clinton Township, MI 48033
Telephone (877) 552-2112
E-mail Mike Panetta at [email protected]

Advertisement. Scroll to continue reading.
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *


You May Also Like


Tony Christian, one of the pioneering drivers of the Pro Street movement, passed away Thursday, June 9. Christian was infamous for his battles with...


The Mid-West Drag Racing Series (MWDRS) is saddened over the passing of Pro Mod driver Ronnie Hobbs following an on-track incident during Friday night...


Leah Pruett scored the first NHRA Top Fuel win for her and husband Tony Stewart’s professional drag racing team this past weekend in Denver,...


Drag racer Sean Serra has passed away in a tragic car accident. He was 27 years old. Serra was involved in a single-car rollover...

Since 2005, DI has informed, inspired and educated drag racers from every walk of the racing life - weekend warrior and street/strip enthusiasts to pro-level doorslammer and Top Fuel racers. From award-winning writing and photography to binge-worthy videos to electric live events, DI meets hundreds of thousands of racers where they live, creating the moments that create conversations.