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WR 91mm Cylinder / Piston Set

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  • Sample 1925S piston with 19mm wrist pin for use with Carrillo Rod.
17.00 LBS

Product Description

WR now offers our own 91mm cylinders made from Durabar cast iron. They are torque plate honed to a +.0005" tolerance using the exact process recommended by CP.  Ring seal is immediate and oil consumption is excellent. They are thermally stable and have been proven through rigorous testing to provide excellent performance and longevity in our 1925cc and 2185cc engines. They also have a special treatment to prevent corrosion and promote heat dissipation. Head sealing and deck height adjustment is done using our exclusive copper head gasket. 

Forged pistons are made to WR specifications by CP. They include a 1.0/1.2/2.8mm ring package that is designed to seal quickly on initial break-in. The second ring is now a special gapless design from Total Seal. The gapless second ring provides better oil control and piston stability.  Standard options are: moly/graphite skirt coating for maximum oil retention, double pin oilers for improved wrist pin lubrication, contact reduction grooves to prevent detonation, an accumulator groove above the second ring to improve ring seal, a lightweight wrist pin retained by wire locks, and clearance for a 36mm exhaust valve. Rings are pre gapped at WR.

You can't buy a better big bore piston/cylinder combination for the 356/912 engine!

  • Wrist pins are available in 19mm and 22mm for 74mm stroke, and 19mm only for 84mm stroke.
  • Compression ratio is 9.7:1 for the 1925cc engines using the WR68 camshaft, and 10:1 for the 1925S engine using the WR78 camshaft.
  • Compression ratio is 10:1 for the 2185cc engine using the WR78 camshaft.
  • WR Cylinder Head Studs are recommended.
  • All pistons are in stock with the WR chamber/dome design. Other dome dimensions can be special ordered.

If you're interested in purchasing the WR Piston/Cylinder kit please call 1-562-439-3333


We now have our own 86mm Durabar cylinders and CP pistons with all the same features as the 91s. Please inquire.


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