Wössner Forged Piston Kit

Wössner forged piston kit.



Fits:
Porsche 997 (911) Carrera S & 4S 3.8L 24v

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: K9474
Engine Type: M97.01
OE Bore Size: 99.00mm

Bore Sizes Available:
- 99.00mm - 3824.21, Compression Ratio: 11.8:1
- 99.50mm - 3862.93, Compression Ratio: 11.9:1
- 100.00mm - 3901.85, Compression Ratio: 12.0:1

Bore Size 99.00mm
Piston Size: 98.93mm
Over Size: 0mm
Displacement CC: 3824cc
Dome / Bowl Volume: 13.8cc
Wössner Comp Ratio: 11.8:1
Ring Part Number: 960XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores

Bore Size 99.50mm
Piston Size: 99.43mm
Over Size: 0.5mm
Displacement CC: 3862cc
Dome / Bowl Volume: 13.8cc
Wössner Comp Ratio: 11.9:1
Ring Part Number: 965XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores

Bore Size 100.00mm
Piston Size: 99.93mm
Over Size: 1mm
Displacement CC: 3901cc
Dome / Bowl Volume: 13.8cc
Wössner Comp Ratio: 12.0:1
Ring Part Number: 970XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores

Standard
Stroke: 82.8mm
Dome/Bowl Volume: -13.8cc
OE Comp. Ratio: 11.8:1
Comp. Height : 33mm
Valves Per Cylinder: 4
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.

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Related, superseded, cross reference or alternative numbers for comparison.

K9474

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