Wössner Pistons

Fits:
Porsche 911 T 2.2 12v 1969-71 (125PS)
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9135
Engine Type: 911.03
OE Bore Size: 84.00mm
Bore Sizes Available:
- 84.00mm - 2194.54cc, Compression Ratio: 8.5:1
- 84.50mm - 2220.74cc, Compression Ratio: 8.59:1
- 85.00mm - 2247.10cc, Compression Ratio: 8.68:1
Bore Size 84.00mm
Piston Size: 83.94mm – K9135DA
Over Size: 0mm
Displacement CC: 2194cc
Dome / Bowl Volume: 19.1cc
Wössner Comp Ratio: 8.5:1
Ring Part Number: 840XTY
Bore Size 84.50mm
Piston Size: 84.44mm – K9135D050
Over Size: 0.5mm
Displacement CC: 2220cc
Dome / Bowl Volume: 19.1cc
Wössner Comp Ratio: 8.59:1
Ring Part Number: 845XTY
Bore Size 85.00mm
Piston Size: 84.94mm – K9135D100
Over Size: 1mm
Displacement CC: 2246cc
Dome / Bowl Volume: 19.1cc
Wössner Comp Ratio: 8.68:1
Ring Part Number: 850XTY
Standard
Stroke: 66mm
Dome/Bowl Volume: +19.1cc
OE Comp. Ratio: 8.6:1
Comp. Height: 34mm
Valves Per Cylinder: 2
Cylinders: 6
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.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)

Fits:
Porsche 911 S 2.2 12v 1969-70 (180PS)
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9103
Engine Type: 911.02
OE Bore Size: 84.00mm
Bore Sizes Available:
- 84.00mm - 2194.54cc, Compression Ratio: 10.5:1
- 84.50mm - 2220.74cc, Compression Ratio: 10.61:1
- 85.00mm - 2247.10cc, Compression Ratio: 10.73:1
Bore Size 84.00mm
Piston Size: 83.94mm – 83.94mm
Over Size: 0mm
Displacement CC: 2340cc
Dome / Bowl Volume: 29.4cc
Wössner Comp Ratio: 10.5:1
Ring Part Number: 840XSY
Bore Size 84.50mm
Piston Size: 84.44mm – K9103D050
Over Size: 0.5mm
Displacement CC: 2368cc
Dome / Bowl Volume: 29.4cc
Wössner Comp Ratio: 10.61:1
Ring Part Number: 845XSY
Bore Size 85.00mm
Piston Size: 84.94mm – K9103D100
Over Size: 1mm
Displacement CC: 2396cc
Dome / Bowl Volume: 29.4cc
Wössner Comp Ratio: 10.73:1
Ring Part Number: 850XSY
Standard
Stroke: 66mm
Dome/Bowl Volume: +29.4cc
OE Comp. Ratio: 9.8:1
Comp. Height: 34mm
Valves Per Cylinder: 2
Cylinders: 6
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.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)

Fits:
Porsche 911 S/E/T 2.4L
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9482
Engine Type: -
OE Bore Size: 84.00mm
Bore Sizes Available:
- 84.00mm - 2194.54cc, Compression Ratio: 10:1
- 84.50mm - 2220.74cc, Compression Ratio: 10.11:1
- 85.00mm - 2247.10cc, Compression Ratio: 10.22:1
Bore Size 84.00mm
Piston Size: 83.94mm – K9482DA
Over Size: 0mm
Displacement CC: 2340cc
Dome / Bowl Volume: 24.6cc
Wössner Comp Ratio: 10:1
Ring Part Number: 840XSY
Bore Size 84.50mm
Piston Size: 84.44mm – K9482D050
Over Size: 0.5mm
Displacement CC: 2368cc
Dome / Bowl Volume: 24.6cc
Wössner Comp Ratio: 10.11:1
Ring Part Number: 845XSY
Bore Size 85.00mm
Piston Size: 84.94mm – K9482D100
Over Size: 1mm
Displacement CC: 2396cc
Dome / Bowl Volume: 24.6cc
Wössner Comp Ratio: 10.22:1
Ring Part Number: 850XSY
Standard
Stroke: 70.4mm
Dome/Bowl Volume: +24.6cc
Comp. Height: 34mm
Valves Per Cylinder: 2
Cylinders: 6
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.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)

Fits:
Porsche RS 2.7 1973
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9413
Engine Type: -
OE Bore Size: 90.00mm
Bore Sizes Available:
- 90.00mm - 2687.19cc, Compression Ratio: 11.6:1
- 92.00mm - 2807cc, Compression Ratio: 11.6:1
Bore Size 90.00mm
Piston Size: 89.95mm – K9413DA
Over Size: 0mm
Displacement CC: 2686cc
Dome / Bowl Volume: 31.5cc
Wössner Comp Ratio: 11.6:1
Ring Part Number: 900XSY
Bore Size 92.00mm
Piston Size: 91.95mm – K9413D200
Over Size: 2mm
Displacement CC: 2807cc
Dome / Bowl Volume: 31.5cc
Wössner Comp Ratio: 11.6:1
Ring Part Number: 920XSY
Standard
Stroke: 70.4mm
Dome/Bowl Volume: +26.4cc
Wössner Comp. Ratio: 11.6:1
OE Comp. Ratio: 8.5:1
Comp. Height: 32.5mm
Valves Per Cylinder: 2
Cylinders: 6
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.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
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.