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JE Pistons

The origins of what we know today as JE Pistons can be traced back to 1912 and the Los Angeles foundry of William Jahns Sr. and his company W.H. Jahns. Employing the tagline, “Nothing but Pistons,” the W.H. Jahns company produced pistons and semi-finished pistons until 1948, when Jahns Sr. retired. Meanwhile, Jahns’ son, William “Uncle Bill” Jahns Jr., started and had been working on his company Jahns’ Racing Pistons since 1947. Shortly after, the business became Jahns’ Engineering Pistons, and was finally shortened to JE Pistons.

Through the following years, JE Pistons’ technology evolved, from mastering casting technology in the 60s to researching and implementing forging technology in the 70s. Numerical Controlled (NC) machines were introduced to manufacturing in the early 80s, which was quickly improved to the use of Computer Numerical Controlled (CNC) machines and a proprietary piston design and machining program in the mid-80s.

JE Pistons has continued to evolve their manufacturing processes, currently offering racing pistons either off the shelf or fully custom. JE pistons are all designed, forged, and machined in-house, allowing control over every step of the piston-making process. JE’s 7+ decades of experience in high-level racing has led to offering premium racing features, including full billet construction, EN plating, and purpose-designed coatings, to name a few.

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JE Pistons Honda K24A2 87mm Bore 2.04cc 10.0:1 CR Kit - Set of 4 Pistons JE Pistons Honda K24A2 87mm Bore 2.04cc 10.0:1 CR Kit - Set of 4 Pistons Quick View
JE Pistons

JE Pistons Honda K24A2 87mm Bore 2.04cc 10.0:1 CR Kit - Set of 4 Pistons

$949.99
JEP376664
Engine Components JE Pistons Piston Sets - Forged - 4cyl
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
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JE Pistons

JE Pistons 2025 Kawasaki KX250 -2.8cc 78.00mm Bore Piston Kit

$411.99
JEP396805
Engine Components JE Pistons Piston Pins Piston Sets - Powersports
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
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JE Pistons

JE Pistons 0.866in Diameter / 2.250in Length / 0.230in Wall / 9310 Wrist Pin

$64.26
JEP866-2250-20-93C
Engine Components JE Pistons Piston Pins Under 100
This Trend Wrist Pin is made in the USA from premium, AISI 9310 Nickel Carbon Steel Alloy making it the perfect upgrade for your...
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JE Pistons

JE Pistons Subaru EJ20 Single Piston - 92.50 mm Bore - 1.287 in. CH -11.70 CC- Right

$299.99
JEP314438R
Engine Components JE Pistons Pistons - Forged - Single
Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applicationsDesigned specifically for each engine and use application to...
JE Pistons BMW S50B30 11:5 KIT Set of 6 Pistons JE Pistons BMW S50B30 11:5 KIT Set of 6 Pistons Quick View
JE Pistons

JE Pistons BMW S50B30 11:5 KIT Set of 6 Pistons

$1,349.99
JEP361350
Engine Components JE Pistons Piston Sets - Forged - 6cyl
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
JE Pistons Chevy LS III/IV Piston Kit Bore 4.18 In (Set of 8) JE Pistons Chevy LS III/IV Piston Kit Bore 4.18 In (Set of 8) Quick View
JE Pistons

JE Pistons Chevy LS III/IV Piston Kit Bore 4.18 In (Set of 8)

$1,016.99
JEP323990
Engine Components JE Pistons Piston Sets - Forged - 8cyl Pistons - Forged - Single
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
JE Pistons Toyota 2JZ-GTE 86.25mm Bore 13.60cc Dish 9:5:1 CR - Set of 6 JE Pistons Toyota 2JZ-GTE 86.25mm Bore 13.60cc Dish 9:5:1 CR - Set of 6 Quick View
JE Pistons

JE Pistons Toyota 2JZ-GTE 86.25mm Bore 13.60cc Dish 9:5:1 CR - Set of 6

$1,349.99
JEP361336
Engine Components JE Pistons Piston Sets - Forged - 6cyl
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
Quick View
JE Pistons

JE Pistons 13+ Hyundai Gamma GDI 1.6 Turbo 77.50mm Bore -8.7cc Dish Piston - Single

$299.99
JEP361286S
Engine Components JE Pistons Pistons - Forged - Single
Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applicationsDesigned specifically for each engine and use application to...
JE Pistons Ring Sets 91.50mm Bore 1.0mm Top Ring 1.2mm Second Ring 2.8mm Oil Ring Quick View
JE Pistons

JE Pistons Ring Sets 91.50mm Bore 1.0mm Top Ring 1.2mm Second Ring 2.8mm Oil Ring

$183.99
JEPJG1004-3602
Engine Components JE Pistons Piston Rings
JE Piston Rings are designed to maximize horsepower through precision sealing of combustion pressure. They are offered in a huge selection of sizes, various...
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JE Pistons

JE Pistons Subaru EJ Series Piston = 92.5mm Bore - 1.287in Ch - -3.80cc - Right

$349.99
JEP361322R
Engine Components JE Pistons Piston Sets - Forged - 4cyl Pistons - Forged - Single
Designed for Power: Every feature on Ultra Series Pistons are optimized to perform high-horsepower racing enginesAligned Grain Flow Technology: Exclusively available on JE Ultra...
JE Pistons 07+ Mitsubishi EVO X 4B11 86.25 Bore 10.0:1 +1.1cc Dome (Set of 4) JE Pistons 07+ Mitsubishi EVO X 4B11 86.25 Bore 10.0:1 +1.1cc Dome (Set of 4) Quick View
JE Pistons

JE Pistons 07+ Mitsubishi EVO X 4B11 86.25 Bore 10.0:1 +1.1cc Dome (Set of 4)

$899.99
JEP361294
Engine Components JE Pistons Piston Sets - Forged - 4cyl
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
JE Pistons Porsche 3L Aircooled Piston Kit - 95MM Bore - 1.335 In CH - 38.50 CC JE Pistons Porsche 3L Aircooled Piston Kit - 95MM Bore - 1.335 In CH - 38.50 CC Quick View
JE Pistons

JE Pistons Porsche 3L Aircooled Piston Kit - 95MM Bore - 1.335 In CH - 38.50 CC

$1,874.99
JEP353246
Engine Components JE Pistons Piston Sets - Forged - 6cyl
As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons...
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