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P21253-20

1275 +20 HIGH COMPRESSION PISTON - SINGLE

Low drag 1275 piston standard size 2.780 plus 20 thou oversize(Rings included).

This piston has a possible compression ratio of 10.3:1 as fitted to Cooper RSP 1990.

The best performance 1275 pistons are C-STN100 range which have 9.73cr when the piston is 1mm down the block. . Current pistons differ from the 60s originals and now have a "low drag" slipper skirt design and a shorter lighter 20.6mm wrist pin. Wrist pin height is 1.5276" to crown with a top dish of 8cc.

Performance is enhanced by the use of 3mm oil rings and the smaller drain slot behind this ring decreases the risk of breakage and 2 of 1.5 mm compression rings. Crown depth to first ring is about 10mm

Rings are R41570-20.

AE Hepolite is now owned by Federal Mogul and trademarked "Nural"

Sold singly,4 per engine required--was Rover piston TAM2050-00 stamped AE21963 as fitted to 1990 Cooper 1275 engines. Now Nural stamped 87-524107-00
  • £48.75 exc vat
  • £58.50 inc vat

 In stock

 
help Recommended usage 4 x P21253-20 to fit one mini.
 
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