JE has pioneered a new range of asymmetrical pistons for GM LS engines. Available off-the-shelf, they are the first of their kind.
Known as asymmetrical because their skirts are of noticeably different sizes—a thrust side and a non-thrust side that address disproportionate loads in the cylinder. Also, the piston pin is positioned slightly off center.
The piston is designed to support high cylinder pressures in applications producing over 1,500 horsepower–including forced induction and nitrous–but JE says it will also operate happily in naturally aspirated LS engines. Beyond this, the piston configuration promotes lightness, strength, and durability as its unique design enables material to be distributed in the areas exposed to higher stresses. The major skirt, which operates on the thrust side, combats the highest side loads. The lowest side loads, in contrast, are handled by the minor skirt, which is free of undue weight and friction.
Further weight reductions are achieved with 106-gram wrist pins. Measuring 2.250 inches long, these compare favorably with the pins of traditional full-round piston designs that measure 2.750in and weigh 130 grams. Pins and accompanying round wire locks are included in each piston kit.
JE’s newest pistons are made from high-strength 2618 aluminum alloy and machined to work with rings of 1.2mm, 1.2mm, and 3mm. JE’s Pro Seal ring pack distinguishes itself by including a carbon steel nitride top ring. Inherently suited to nitrous and forced induction, it has a more durable ring face than the plasma moly inlay type. The most interesting element of their second ring, a Napier-style hooked face ring, is that it possesses oil control attributes not found in conventional tapered second rings. The remaining component of the ring pack, the oil control ring, is 3.0mm with standard tension. However, it is devised to operate in conjunction with the special qualities of the Napier.
Finally, these new asymmetrical LS designs accommodate factory oiling squirter systems, which will continue to spray in the correct locations and keep the pistons cool. To further reduce the likelihood of hot spots and pre-ignition, JE adds smooth-finish crowns, a process that blends all the edges of the piston crown, including the valve reliefs. JE’s new asymmetrical forging designs allow for the use of the most popular stroke and rod combination while eliminating reluctor wheel clearance problems.
For more information, you can check out JE’s website here.
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