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Porsche > 993 (911) (1994-1998) > 993 (911) C4S 1994-97 > Engine Rebuild Parts > Engine Cylinders / Liners / Pistons >

JE Pistons

JE Pistons

DISPLAYING 1 to 4 (of 4 products)
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) 2.00mm Oversize - 96410391512, 96410391522, 96410391527, 964103391513, 96410391523, 96410391519, 96410391524, 96410391520, 96410391525, 99310391511, 99310391521, 99310391526, 99310391531, 99310391512, 99310391522, 99310391527, 99310591532, 99310391513, 99310391523 - JE-381262, 381262
4
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) 2.00mm Oversize
381262
Product Information
Product Information
JE Piston - Set of 6
Forged from 4032 Aluminium Alloy

jepiston

Fits:
Porsche 964 / 993 3.6ltr (11.0:1)

Engine Size : 3.6ltr
Bore Size: 102.00mm
Stroke: 76.40mm
Rod length: 127.00mm
Compression Distance : 31.80mm
Compression Ratio: 11.0:1
Oversize: 2.00mm
Material: 4032 Aluminium Alloy

JE designs are specifically engineered for extreme applications up to and including professional competition. In this environment, the higher compression ratios, high boost or heavy nitrous use necessitate the higher tensile strength of 4032 and 2618 aluminium alloy, which has been optimized for aftermarket Nikasil cylinders. The JE Piston Porsche series now include low friction skirt coatings and are lighter than before, improving both performance and longevity.

The Dome/Dish require no deburring or preparation and feature a smooth flowing radii for excellent flame travel.

4032 Aluminium Alloy
Pistons manufactured from 4032 wrought aluminium alloy are designed for high performance applications where a strong and quiet piston is required. These pistons require less initial piston to cylinder wall clearance and are quieter at start-up. Ideal for street/road use

Piston Features:
• Accumulator Grooves
• Contact Reduction Grooves
• Double Broach Oilers
• Skirt Coating
• Under crown Milling for Weight Reduction
• Pin Fitting, Wire Locks and Rings Included



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Related, superseded, cross reference or alternative numbers for comparison.

381262
96410391512
96410391522
96410391527
964103391513
96410391523
96410391519
96410391524
96410391520
96410391525
99310391511
99310391521
99310391526
99310391531
99310391512
99310391522
99310391527
99310591532
99310391513
99310391523

The product you are viewing cross references to these numbers
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) 3.15mm Oversize - 96410391512, 96410391522, 96410391527, 964103391513, 96410391523, 96410391519, 96410391524, 96410391520, 96410391525, 99310391511, 99310391521, 99310391526, 99310391531, 99310391512, 99310391522, 99310391527, 99310591532, 99310391513, 99310391523 - JE-381263, 381263
4
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) 3.15mm Oversize
381263
Product Information
Product Information
JE Piston - Set of 6
Forged from 4032 Aluminium Alloy

jepiston

Fits:
Porsche 964 / 993 3.6ltr (11.0:1)

Engine Size : 3.6ltr
Bore Size: 103.12mm
Stroke: 76.40mm
Rod length: 127.00mm
Compression Distance : 31.80mm
Compression Ratio: 11.0:1
Oversize: 3.15mm
Material: 4032 Aluminium Alloy

JE designs are specifically engineered for extreme applications up to and including professional competition. In this environment, the higher compression ratios, high boost or heavy nitrous use necessitate the higher tensile strength of 4032 and 2618 aluminium alloy, which has been optimized for aftermarket Nikasil cylinders. The JE Piston Porsche series now include low friction skirt coatings and are lighter than before, improving both performance and longevity.

The Dome/Dish require no deburring or preparation and feature a smooth flowing radii for excellent flame travel.

4032 Aluminium Alloy
Pistons manufactured from 4032 wrought aluminium alloy are designed for high performance applications where a strong and quiet piston is required. These pistons require less initial piston to cylinder wall clearance and are quieter at start-up. Ideal for street/road use

Piston Features:
• Accumulator Grooves
• Contact Reduction Grooves
• Double Broach Oilers
• Skirt Coating
• Under crown Milling for Weight Reduction
• Pin Fitting, Wire Locks and Rings Included



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

381263
96410391512
96410391522
96410391527
964103391513
96410391523
96410391519
96410391524
96410391520
96410391525
99310391511
99310391521
99310391526
99310391531
99310391512
99310391522
99310391527
99310591532
99310391513
99310391523

The product you are viewing cross references to these numbers
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) 5.03mm Oversize - 96410391512, 96410391522, 96410391527, 964103391513, 96410391523, 96410391519, 96410391524, 96410391520, 96410391525, 99310391511, 99310391521, 99310391526, 99310391531, 99310391512, 99310391522, 99310391527, 99310591532, 99310391513, 99310391523 - JE-381264, 381264
4
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) 5.03mm Oversize
381264
Product Information
Product Information
JE Piston - Set of 6
Forged from 4032 Aluminium Alloy

jepiston

Fits:
Porsche 964 / 993 3.6ltr (11.0:1)

Engine Size : 3.6ltr
Bore Size: 105.03mm
Stroke: 76.40mm
Rod length: 127.00mm
Compression Distance : 31.80mm
Compression Ratio: 11.0:1
Oversize: 5.03mm
Material: 4032 Aluminium Alloy

JE designs are specifically engineered for extreme applications up to and including professional competition. In this environment, the higher compression ratios, high boost or heavy nitrous use necessitate the higher tensile strength of 4032 and 2618 aluminium alloy, which has been optimized for aftermarket Nikasil cylinders. The JE Piston Porsche series now include low friction skirt coatings and are lighter than before, improving both performance and longevity.

The Dome/Dish require no deburring or preparation and feature a smooth flowing radii for excellent flame travel.

4032 Aluminium Alloy
Pistons manufactured from 4032 wrought aluminium alloy are designed for high performance applications where a strong and quiet piston is required. These pistons require less initial piston to cylinder wall clearance and are quieter at start-up. Ideal for street/road use

Piston Features:
• Accumulator Grooves
• Contact Reduction Grooves
• Double Broach Oilers
• Skirt Coating
• Under crown Milling for Weight Reduction
• Pin Fitting, Wire Locks and Rings Included



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

381264
96410391512
96410391522
96410391527
964103391513
96410391523
96410391519
96410391524
96410391520
96410391525
99310391511
99310391521
99310391526
99310391531
99310391512
99310391522
99310391527
99310591532
99310391513
99310391523

The product you are viewing cross references to these numbers
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) STD Size - 96410391512, 96410391522, 96410391527, 964103391513, 96410391523, 96410391519, 96410391524, 96410391520, 96410391525, 99310391511, 99310391521, 99310391526, 99310391531, 99310391512, 99310391522, 99310391527, 99310591532, 99310391513, 99310391523 - JE-381261, 381261
4
JE Piston Set Forged 4032 Aluminium Alloy. Porsche 911 3.6ltr (11.0:1) STD Size
381261
Product Information
Product Information
JE Piston - Set of 6
Forged from 4032 Aluminium Alloy

jepiston

Fits:
Porsche 964 / 993 3.6ltr (11.0:1)

Engine Size : 3.6ltr
Bore Size: 100.00mm
Stroke: 76.40mm
Rod length: 127.00mm
Compression Distance : 31.80mm
Compression Ratio: 11.0:1
Oversize: Standard (STD) 
Material: 4032 Aluminium Alloy

JE designs are specifically engineered for extreme applications up to and including professional competition. In this environment, the higher compression ratios, high boost or heavy nitrous use necessitate the higher tensile strength of 4032 and 2618 aluminium alloy, which has been optimized for aftermarket Nikasil cylinders. The JE Piston Porsche series now include low friction skirt coatings and are lighter than before, improving both performance and longevity.

The Dome/Dish require no deburring or preparation and feature a smooth flowing radii for excellent flame travel.

4032 Aluminium Alloy
Pistons manufactured from 4032 wrought aluminium alloy are designed for high performance applications where a strong and quiet piston is required. These pistons require less initial piston to cylinder wall clearance and are quieter at start-up. Ideal for street/road use

Piston Features:
• Accumulator Grooves
• Contact Reduction Grooves
• Double Broach Oilers
• Skirt Coating
• Under crown Milling for Weight Reduction
• Pin Fitting, Wire Locks and Rings Included



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

381261
96410391512
96410391522
96410391527
964103391513
96410391523
96410391519
96410391524
96410391520
96410391525
99310391511
99310391521
99310391526
99310391531
99310391512
99310391522
99310391527
99310591532
99310391513
99310391523

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 4 products)
Also found on these pages
About JE Pistons

JE Pistons for High-Output, High-Strength & Precision-Built Porsche Engine Rebuilds

JE Pistons are engineered for engines that need uncompromising strength, exceptional reliability and maximum performance. Manufactured from forged aluminium using motorsport-grade techniques, JE components deliver superior durability under extreme cylinder pressures, high RPM loads and elevated combustion temperatures. These pistons are a top choice for performance road builds, turbocharged applications, high-compression setups and competition-focused Porsche engines.

Whether you’re building a reliable street performer or a full racing engine, JE Pistons provide the toughness, stability and precision needed to extract the best from your powerplant.

What JE Pistons Do

JE Pistons enhance engine performance and durability by:

  • Providing exceptional structural strength for boosted or high-RPM operation
  • Reducing reciprocating mass for improved throttle response
  • Increasing combustion efficiency with advanced crown and skirt designs
  • Offering superior heat resistance under extreme load
  • Maintaining consistent sealing with precision-machined ring grooves
  • Reducing friction, improving smoothness and efficiency
  • Supporting aggressive tuning without sacrificing reliability

These pistons are engineered to handle the demands that standard cast pistons cannot tolerate.

Why Pistons Commonly Fail

Internal combustion engines place enormous stress on pistons—especially in modified or aging powerplants. Common piston failures include:

  • Detonation and pre-ignition, damaging crowns and ring lands
  • Oil starvation, leading to scuffing, seizure or skirt collapse
  • Thermal overload, often in turbo or track environments
  • Material fatigue from high mileage or frequent high-rev use
  • Incorrect tuning, creating lean conditions and excessive heat
  • Excessive boost pressure, overwhelming cast pistons
  • Protective coating wear, causing friction and heat issues

Symptoms include smoke, low compression, knocking noises, oil consumption and visible piston scoring.

Why You Should Replace Old Pistons with JE Forged Components

Upgrading to precision-engineered JE forged pistons—designed to surpass original performance and durability levels—provides major benefits for any serious rebuild.

Key advantages include:

  • Superior strength under extreme boost or high RPM
  • Improved compression retention and sealing efficiency
  • Reduced risk of piston failure in racing or track conditions
  • Enhanced power delivery with optimised combustion characteristics
  • Longer lifespan thanks to premium-grade forging materials
  • Smoother, more responsive engine performance
  • Confidence when running aggressive tunes, high compression or forced induction

JE Pistons are an essential upgrade for builders targeting motorsport-grade reliability.

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