Low drag 1275 piston standard size 2.780 plus 40 thou oversize(Rings included). This piston has a possible compression ratio of 10.3:1 as fitted to Cooper RSP 1990.Engine then becomes 1310cc 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…
20 thou oversize low drag slipper type pistons for modern day compression ratios and unleaded fuel. Typically installation will result in a minimum 8.8:1 compression ratio but on some pre 1984 Metro versions it was higher. Current pistons differ from the 60s originals, improved with a "low drag" slipper skirt design and a shorter lighter wrist pin. Wrist pin height…