Defric coating (Lubricous film) is applied to the piston skirt, for a reduction in friction and loads as well as improved durability.
4B11 Forged Piston KIT
4B11 for EVO X
Crown Volume *1
Projection Height *2
Reference C/R *3,
Standard head GK 87.0mm t=1.0mm
TODA head GK 88.0mm t=1.0mm
*1:Crown volume is measured "from the piston shoulder"/"from the deck of the block".
*2:Piston shoulder height is measured from the deck of the block.
*3:The compression ratios given above are only to be taken as a guide, measurements are required.