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Company: Diamond Pistons
www.diamondracing.net

Replacement Competition Diesel Pistons

New Heavy-duty Duramax Billet Aluminum Pistons Accept Over 50 psi Boost Pressures

For GM Duramax competition diesel engines, Diamond has announced new 2618 billet aluminum pistons to replace the original aluminum castings.

While these new pistons will prove useful for enthusiasts engaging in drag racing, off-roading and towing it is in the cut and thrust of truck pulling where Diamond believes these pistons will excel. As boost pressures exceed 50psi and billet aluminum blocks demonstrate their strength, Diamond has aimed for maximum structural integrity. They promote robustness throughout the full architecture of the piston, particularly the crowns and pin bosses, and they transfer the forces to the connecting rods via Trend’s strong H13 tool steel pins.

To lubricate the pin two substantial oiling holes are located in the piston pin bores. In addition several styles of oiling grooves are optionally available, including a deep, 360-degree, circular oiling groove. Beyond this a notch is machined in the piston skirt to accommodate the OEM oiling nozzle, promoting a further source of lubrication for the pin.

To evacuate oil from the oil control rings Diamond uses 70/30 oil drains in the piston groove. This means 70 percent of each oiling hole is located inside the groove and 30 percent below the groove. Those parts below the groove transfer oil to the piston internals and force-feed the pin bosses during the downward scrape; those inside the groove (70 percent) transfer their oil during the upward scrape. Ring packs comprise 5/64˝ (top) x 5/64˝ (2^nd) x 3/16˝ (oil control).

Because air-fuel combustion speeds depend on turbulence, a 3/4˝ wide piston rim is provided around the crown to promote squish or quench, forcing air to the center of the swirl chamber. Turbulence is further incited by use of a spherical dome and the undercut space under the rim.

To resist high temperatures and pressures Diamond administers their hard-anodizing process to the complete piston. To combat potential piston damage from side loading and piston rock they apply a molybdenum coat to its skirt.

 

• OEM aluminum castings replaced by robust 2618 Diamond billets
• Piston crowns constructed to accept 50psi boost pressures and more
• H13 tool steel piston pins supplied to cope with extreme pressures
• Wide perimeter rim to trigger quench action and improve combustion
• Swirl chamber with undercut rim to promote turbulence
• Oil nozzle relief on skirt to lubricate piston pin
• Hard-anodized with moly skirt to prolong life (Diamond’s double-coat)
• Ring packs comprise 5/64˝ (top) x 5/64˝ (2^nd) x 3/16˝ (oil control)

 

For more information contact Diamond Pistons, 23003 Diamond Drive, Clinton Township, MI 48035; Telephone 877-552-2112 or visit www.DiamondRacing.net or e-mail Mike Panetta at MPanetta@DiamondRacing.net