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Wössner Pistons

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DISPLAYING 1 to 4 (of 4 products)
K9476
Product Information
Product Information
Wössner forged piston kit.

wossner

Fits:
Porsche 944 2.5 8v 1988-89

Suitable to use with Nikasil liners.

Specification
Technical information is sourced from Wössner's latest catalogue:

Part Number: K9476
Engine Type: - M44.09, M44.10,
OE Bore Size: 100.00mm

Bore Sizes Available:
- 100.00mm - 2478.71cc, Compression Ratio: 10.6:1
- 100.50mm - 2503.56cc, Compression Ratio: 10.7:1
- 101.00mm -2528.54cc, Compression Ratio: 10.79:1

Bore Size 100.00mm
Piston Size: 99.92mm
Over Size: 0mm
Displacement CC: 2478cc
Dome / Bowl Volume: -0.5cc
Wössner Comp Ratio: 10.6:1
Ring Part Number: 1000XPY

Bore Size 100.50mm
Piston Size: 100.42mm
Over Size: 0.5mm
Displacement CC: 2503cc
Dome / Bowl Volume: -0.5cc
Wössner Comp Ratio: 10.7:1
Ring Part Number: 1005XPY

Bore Size 101.00mm
Piston Size: 100.92mm
Over Size: 1mm
Displacement CC: 2528cc
Dome / Bowl Volume: -0.5cc
Wössner Comp Ratio: 10.79:1
Ring Part Number: 1010XPY

Standard
Stroke: 78.9mm
Dome/Bowl Volume: -
OE Comp. Ratio: 10.2:1
Comp. Height: 40.8mm
Valves Per Cylinder: 2
Cylinders: 4

Please CLICK HERE for Technical release – Piston / Con rod
orientation.


Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.

Price shown is for complete engine set.
K9493
Product Information
Product Information
Wössner forged piston kit.

wossner

Fits:
Porsche 944 S2 (1989-1991)
Porsche 968 (1992-1995)

Suitable to use with Nikasil liners.

Specification
Technical information is sourced from Wössner's latest catalogue:

Part Number: K9493
Engine Type - 3.0 / 944 S2 - M44.41 - M44.43 /
968 - M44.41 - M44.43.

Bore Sizes Available:
- 104.00mm, Compression Ratio: 10.9:1
- 104.50mm, Compression Ratio: 10.9:1
- 105.00mm, Compression Ratio: 10.9:1

Bore Size 104.00mm
Piston Size: 103.92mm – K9493DA
Over Size: 0mm
Displacement CC: 2989cc
Dome / Bowl Volume: 25.5cc
Wössner Comp Ratio: 10.9:1
Ring Part Number: 1040XSU


Bore Size 104.50mm
Piston Size: 104.42mm – K9493D050
Over Size: 0.5mm
Displacement CC: 3018cc
Dome / Bowl Volume: 25.5cc
Wössner Comp Ratio: 10.9:1
Ring Part Number: 1045XSU

Bore Size 105.00mm
Piston Size: 104.92mm – K9493D100
Over Size: 1mm
Displacement CC: 3047cc
Dome / Bowl Volume: 25.5cc
Wössner Comp Ratio: 10.9:1
Ring Part Number: 1050XSU


Standard
Engine CC - 2990 / 3019 / 3048cc.
Stroke - 88.00mm
OE Compression Ratio - 10.9:1.
Compression Height - 36.00mm.
Number of cylinders : 4

Please CLICK HERE for Technical release – Piston / Con rod
orientation.


Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.

Price shown is for complete engine set.
K9477
Product Information
Product Information
Wössner forged piston kit.

wossner

Fits:
Porsche 944 turbo 2.5Ltr

Suitable to use with Nikasil liners.

Specification
Technical information is sourced from Wössner's latest catalogue:

Part Number: K9477
Engine Type: - M44.52
OE Bore Size: 100.00mm

Bore Sizes Available:
- 100.00mm - 2478.71cc, Compression Ratio: 8:1
- 100.50mm - 2503.56cc, Compression Ratio: 8.07:1
- 101.00mm -2528.54cc, Compression Ratio: 8.14:1

Bore Size 100.00mm
Piston Size: 99.92mm – K9477DA
Over Size: 0mm
Displacement CC: 2478cc
Dome / Bowl Volume: 26.6cc
Wössner Comp Ratio: 8:1
Ring Part Number: 1000XTY

Bore Size 100.50mm
Piston Size: 100.42mm – K9477D050
Over Size: 0.5mm
Displacement CC: 2503cc
Dome / Bowl Volume: 26.6cc
Wössner Comp Ratio: 8.07:1
Ring Part Number: 1005XPY

Bore Size 101.00mm
Piston Size: 100.92mm – K9477D100
Over Size: 1mm
Displacement CC: 2528cc
Dome / Bowl Volume: 26.6cc
Wössner Comp Ratio: 8.14:1
Ring Part Number: 1010XTY

Standard
Stroke: 78.9mm
Dome/Bowl Volume: -
OE Comp. Ratio: 8.1:1
Comp. Height: 40.8mm
Valves Per Cylinder: 2
Cylinders: 4

Please CLICK HERE for Technical release – Piston / Con rod
orientation.


Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.

Price shown is for complete engine set.
K9531
Product Information
Product Information
Wössner forged piston kit.

wossner

Fits:
Porsche 944S 2.5Ltr

Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.

Specification
Technical information is sourced from Wössner's latest catalogue:

Part Number: K9531
Engine Type: - M44.40
OE Bore Size: 100.00mm

Bore Sizes Available:
- 100.00mm - 2478.71cc, Compression Ratio: 11.4:1
- 100.50mm - 2528cc, Compression Ratio: 11.4:1
- 101.00mm - 2503cc, Compression Ratio: 11.4:1

Bore Size 100.00mm
Piston Size: 99.92mm
Over Size: 0mm
Displacement CC: 2478cc
Dome / Bowl Volume: -10cc
Wossner Comp Ratio: 11.4:1
Ring Part Number: 1000XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores

Bore Size 100.50mm
Piston Size: 100.42mm
Over Size: 0.5mm
Displacement CC: 2528cc
Dome / Bowl Volume: -10cc
Wossner Comp Ratio: 11.4:1
Ring Part Number: 1005XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores

Bore Size 101.00mm
Piston Size: 100.92mm
Over Size: 1mm
Displacement CC: 2503cc
Dome / Bowl Volume: -10cc
Wossner Comp Ratio: 11.4:1
Ring Part Number: 1010XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores

Standard
Stroke: 78.9mm
Dome/Bowl Volume: -
OE Comp. Ratio: 10.2:1
Comp. Height: 40.6mm
Valves Per Cylinder: 4
Cylinders: 4

Please CLICK HERE for Technical release – Piston / Con rod
orientation.


Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.

Price shown is for complete engine set.
DISPLAYING 1 to 4 (of 4 products)
About Wössner Pistons

High-Strength Wössner Pistons for Performance, Durability & Precision Engine Rebuilds

Wössner pistons are engineered for drivers who demand exceptional strength, reduced weight and superior thermal stability from their engines. Manufactured from forged aluminium for maximum durability, Wössner pistons are designed to withstand high cylinder pressures, elevated temperatures and aggressive tuning—making them ideal for turbocharged, supercharged, high-compression and track-focused Porsche builds.

Whether rebuilding a road-going performance engine or constructing a high-output motorsport power unit, Wössner pistons offer outstanding reliability, enhanced power delivery and long-term durability.

What Wössner Pistons Do

Wössner pistons improve engine performance and reliability by:

  • Increasing strength and durability with forged alloy construction
  • Enhancing combustion efficiency through optimised crown shapes
  • Reducing reciprocating mass, improving throttle response
  • Supporting high RPM operation with stronger piston skirts
  • Maintaining consistent sealing via precision-machined ring lands
  • Managing extreme heat loads for turbocharged and high-compression engines
  • Reducing friction for smoother and more efficient operation

These pistons are specifically engineered to perform in demanding environments where standard components fall short.

Why Pistons Commonly Fail

Even high-performance engines can suffer piston failure due to extreme conditions or insufficient servicing. Common causes include:

  • Detonation or pre-ignition damaging ring lands or piston crowns
  • Thermal overload in turbocharged or high-output engines
  • Oil starvation leading to scuffing or seizure
  • Incorrect fuelling or tuning, creating lean combustion
  • High mileage wear, reducing skirt stability
  • Contamination from debris in the lubrication system
  • Excessive boost pressure, stressing cast pistons beyond their limits

Symptoms include blow-by, low compression, excessive oil consumption, knocking noises, or visible damage during engine teardown.

Why You Should Replace Your Pistons with Wössner Components

Upgrading to precision-engineered Wössner forged pistons designed to exceed original strength and performance characteristics provides significant benefits for any engine rebuild.

Advantages include:

  • Superior durability under high boost or performance driving
  • Stronger resistance to detonation and thermal fatigue
  • Improved compression retention and sealing efficiency
  • Reduced piston mass for enhanced engine response
  • Increased lifespan for performance and track applications
  • More consistent combustion and power delivery
  • Confidence when pushing the engine to its limits

Wössner pistons are a proven choice for rebuilders seeking motorsport-grade reliability and performance.

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