DIAMOND ENTERS DIESEL MARKET WITH NEW COMPETITION PISTON
Tue, 2010-05-11 12:03
Diamond Pistons has taken its first step into the diesel market with a new piston for competition 2-valve TDI Volkswagen engines. These engines, 
produced from the mid-eighties to mid-2000, are commonly found in 1.9 liter Jetta, Golf, and Passat models.
Made from type 2618 aluminum to withstand high-compression forces, Diamond administers their hard anodizing process to the complete piston and, in addition, applies a moly coat to the piston’s skirt. By hard anodizing the piston, they succeeded in eliminating the factory-style cast steel insert in the top ringland, saving 100 grams per piston. Hard anodizing also introduces a thermal barrier which resists higher temperatures and pressures—it also increases both corrosion- and wear-resistance. The baked-on moly dry-film skirt coating provides an anti-friction and an anti-scuffing surface, which combats potential piston damage from side loading and piston rock.
To improve the engine’s quench characteristics, the combustion bowl is wider and shallower than the original equipment by approximately .060in and .025in respectively. A small conical-shaped rise is placed near the center of the piston, similar to that of the factory style. This prevents fuel-wash and assists in minimizing smoke emission.
To protect the top ring from excessive heat, Diamond will extend the depth of the top ringland by .040in to .070in. This option is usually determined by the amount of boost pressure employed. In addition the top ring groove features lateral gas ports, bringing extra pressure to bear on the ring’s inner edge, resulting in better ring-to-wall sealing.
The piston pins are made of the finest H-13 Tool Steel and coated in Casidium, a diamond-like carbon thin coating that increases their surface hardness. Lubricated by twin oilers in each pin bore, the piston pin is offset in the piston body by .020in. This feature is designed to further reduce the drag and wear on the skirts.
A Total Seal® ring pack is provided which includes their Advanced Profile coated stainless steel top ring, Napier-style second ring, and 3.0mm standard tension oil rings. Total Seal Gapless rings are also available.
For more information, visit www.DiamondRacing.net.
produced from the mid-eighties to mid-2000, are commonly found in 1.9 liter Jetta, Golf, and Passat models. Made from type 2618 aluminum to withstand high-compression forces, Diamond administers their hard anodizing process to the complete piston and, in addition, applies a moly coat to the piston’s skirt. By hard anodizing the piston, they succeeded in eliminating the factory-style cast steel insert in the top ringland, saving 100 grams per piston. Hard anodizing also introduces a thermal barrier which resists higher temperatures and pressures—it also increases both corrosion- and wear-resistance. The baked-on moly dry-film skirt coating provides an anti-friction and an anti-scuffing surface, which combats potential piston damage from side loading and piston rock.
To improve the engine’s quench characteristics, the combustion bowl is wider and shallower than the original equipment by approximately .060in and .025in respectively. A small conical-shaped rise is placed near the center of the piston, similar to that of the factory style. This prevents fuel-wash and assists in minimizing smoke emission.
To protect the top ring from excessive heat, Diamond will extend the depth of the top ringland by .040in to .070in. This option is usually determined by the amount of boost pressure employed. In addition the top ring groove features lateral gas ports, bringing extra pressure to bear on the ring’s inner edge, resulting in better ring-to-wall sealing.
The piston pins are made of the finest H-13 Tool Steel and coated in Casidium, a diamond-like carbon thin coating that increases their surface hardness. Lubricated by twin oilers in each pin bore, the piston pin is offset in the piston body by .020in. This feature is designed to further reduce the drag and wear on the skirts.
A Total Seal® ring pack is provided which includes their Advanced Profile coated stainless steel top ring, Napier-style second ring, and 3.0mm standard tension oil rings. Total Seal Gapless rings are also available.
For more information, visit www.DiamondRacing.net.
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