JE M-8 Ultra Series Pistons
Cypress, California based JE Pistons is now offering Ultra Series pistons that have been developed specifically for M-8 engines.
The 'secret sauce', according to the company, is its proprietary 'Aligned Grain Flow' technology. "Being one of the only fully integrated piston manufacturers in the USA, our in-house forging operation has allowed for the development of an improved forging process that maximizes the alignment of the aluminum's grain structure, which translates to 'next level' tensile strength.
"This enables the pistons to stand up to the extreme power the M-8 builds, of 400 hp or more, or simply offer extreme durability for milder builds.
"Ultra Series pistons combine this foundational strength with performance and durability, enhancing features such as JE's Thermal Barrier crown coating, Tuff Skirt coating, anti-detonation grooves, lateral gas ports, an accumulator groove, and more."
The ceramic-based Thermal Barrier crown coating protects the piston by reducing heat transfer, especially in high-heat environments like built M-8 engines. Piston ring provisions, including lateral gas ports and an accumulator groove, aid in maintaining consistent ring seal at the top compression ring, which is crucial to consistent power, especially when power multipliers like turbos get thrown into the mix.
In addition to the 'Aligned Grain Flow' material itself, the forging design that JE uses for its M-8 engine Ultra Series pistons has been optimized with internal and external bracing - features not commonly seen in V-twin piston design. This helps mitigate piston flex under heavy engine loads, adding to the pistons' strength qualities without adding unnecessary weight.
Additional features include 3D under crown milling for additional weight savings, offset pins for reduced piston rock and skirt notches for optimal clearance at bottom dead center.
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| 'Aligned Grain Flow' technology |
They are now available in standard (4.250"), 4.310" (+.060") and 4.320" (+.070") bore sizes (4.500" stroke), each with the option of a 10.25:1 or 11.25:1 compression ratio. They are supplied in kits including two pistons, rings, wrist pins and wire locks - all under the one part number.
JE PISTONS