Oil Support Rail (OSR)

 

Oil Support Rails (OSR) assist in applications where the pin bore breaks through the oil groove of the piston (e.g. short compression heights due to big strokes or long rod lengths). Without it, the oil ring would come off the ring groove through the wristpin opening. OSR have dimples that stop them from rotating thus working as a “bridge” for the ring. These dimples ALWAYS face down and Oil support rails should under no circumstances touch cylinder walls. #themoreyouknow #factfriday #oilsupport #oil #rings #performance #engineering #cppistons #ariaspistons #pistons