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JE Pistons

About 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 to Porsche owners.

4 4 4 4

JE Piston Set. Porsche 911 3.2L 12V (10.5:1)

353287

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.2L 12V (10.5:1)

Engine Size : 3.2
Bore Size: 98.00mm
Stroke: 74.40mm
Rod length: 127.00mm
Compression Distance : 32.80mm
Compression Ratio: 10.5
Dome volume: 38.6cc
Oversize: 3.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

2618 Aluminium Alloy
Pistons manufactured from 2618 wrought aluminium alloy are designed for racing and very demanding applications. These environments necessitate the higher strength 2618 aluminium alloy. When exposed to heat, 2618 aluminium alloy expands 15% more than 4032 aluminium alloy therefore the initial piston to cylinder wall needs to be 15% greater. This difference is most noticeable during cold start. When running at operating temperature both 2618 and 4032 pistons have approximately the same clearances.

Includes:
• Accumulator Grooves
• Skirt Coating
• 3D Lightweight Undercrown Milling
• Pin fitting and wire locks
• 9310 high carbon alloy or tool steel wrist pins
• Rings Included

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

353287

353287

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.2L 12V (9.5:1)

353286

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.2L 12V (9.5:1)

Engine Size : 3.2
Bore Size: 98.00mm
Stroke: 74.40mm
Rod length: 127.00mm
Compression Distance : 32.80mm
Compression Ratio: 9.5
Dome volume: 31.6cc
Oversize: 3.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353286

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.2L 12V (11.5:1)

353285

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.2L 12V (11.5:1)

Engine Size : 3.2
Bore Size: 95.00mm
Stroke: 74.40mm
Rod length: 127.00mm
Compression Distance : 32.80mm
Compression Ratio: 11.5
Dome volume: 47.0cc
Oversize: STD

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

Includes:
• Accumulator Grooves
• Skirt Coating
• 3D Lightweight Undercrown Milling
• Pin fitting and wire locks
• 9310 high carbon alloy or tool steel wrist pins
• Rings Included

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

353285

353285

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.2L 12V (10.5:1)

353284

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.2L 12V (10.5:1)

Engine Size : 3.2
Bore Size: 95.00mm
Stroke: 74.40mm
Rod length: 127.00mm
Compression Distance : 32.80mm
Compression Ratio: 10.5
Dome volume: 41.7cc
Oversize: STD

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353284

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.2L 12V (9.5:1)

353283

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.2L 12V (9.5:1)

Engine Size : 3.2
Bore Size: 95.00mm
Stroke: 74.40mm
Rod length: 127.00mm
Compression Distance : 32.80mm
Compression Ratio: 9.5
Dome volume: 35.1cc
Oversize: STD

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353283

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (11.5:1)

353256

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.0L (11.5:1)

Engine Size : 3.0
Bore Size: 102.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 11.5
Dome volume: 43.5cc
Oversize: 7.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353256

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (10.5:1)

353255

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

Fits:
Porsche 911 3.0L (10.5:1)

Engine Size : 3.0
Bore Size: 102.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 10.5
Dome volume: 37.7cc
Oversize: 7.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353255

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (11.5:1)

353254

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.0L (11.5:1)

Engine Size : 3.0
Bore Size: 100.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 11.5
Dome volume: 45.3cc
Oversize: 5.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353254

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (10.5:1)

353253

Product Information

JE Piston - Set of 6
Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.0L (10.5:1)

Engine Size : 3.0
Bore Size: 100.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 10.5
Dome volume: 39.8cc
Oversize: 5.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353253

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (9.5:1)

353252

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

Fits:
Porsche 911 3.0L (9.5:1)

Engine Size : 3.0
Bore Size: 100.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 9.5
Dome volume: 32.9cc
Oversize: 5.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353252

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (11.5:1)

353251

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

Fits:
Porsche 911 3.0L (11.5:1)

Engine Size : 3.0
Bore Size: 98.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 11.5
Dome volume: 47.1cc
Oversize: 3.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353251

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (10.5:1)

353250

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.0L (10.5:1)

Engine Size : 3.0
Bore Size: 98.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 10.5
Dome volume: 41.7cc
Oversize: 3.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353250

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (9.5:1)

353249

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.0L (9.5:1)

Engine Size : 3.0
Bore Size: 98.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 9.5
Dome volume: 35.7cc
Oversize: 3.00mm

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353249

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (11.5:1)

353248

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

Fits:
Porsche 911 3.0L (11.5:1)

Engine Size : 3.0
Bore Size: 95.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 11.5
Dome volume: 49.7cc
Oversize: STD

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353248

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (10.5:1)

353247

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

Fits:
Porsche 911 3.0L (10.5:1)

Engine Size : 3.0
Bore Size: 95.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 10.5
Dome volume: 44.7cc
Oversize: STD

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353247

The product you are viewing cross references to these numbers

4 4 4 4

JE Piston Set. Porsche 911 3.0L 12V (9.5:1)

353246

Product Information

JE Piston - Set of 6

Forged from 2618 Aluminium Alloy

jepiston

Fits:
Porsche 911 3.0L (9.5:1)

Engine Size : 3.0
Bore Size: 95.00mm
Stroke: 70.40mm
Rod length: 127.80mm
Compression Distance : 33.90mm
Compression Ratio: 9.5
Dome volume: 38.5cc
Oversize: STD

Designed for Porsche Air-cooled 911 engines compatible with a Nickel Ceramic bore, these pistons are machined from forged 2618 alloy for greater strength. The valve pockets are machined to accommodate high lift cams, and accept the stock stroke and rod length. The ring grooves are precision CNC machined and all new applications include skirt coating and 3D undercrown milling. Piston clearances designed for aluminum cylinders, steel/iron cylinders may require additional clearance.

353246

The product you are viewing cross references to these numbers

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