Defric coating (Lubricous film) is applied to the piston skirt, for a reduction in friction and loads as well as improved durability.
4G63 Forged Piston KIT for EVO I ~ IX
4G63 for EVO I ~ IX
Crown Volume *1
Projection Height *2
Reference C/R *3, 5, 6
TODA head GK 86.5mm t=1.2mm EVO I~VIII ξ≈8.6:1
TODA head GK 86.5mm t=1.5mm EVO I~VIII ξ≈8.4:1
TODA head GK 87.5mm t=1.2mm EVO I~VIII ξ≈8.8:1
TODA head GK 87.5mm t=1.5mm EVO I~VIII ξ≈8.6:1
*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.
*5:EVO I~VIII designed using 46cc as combustion chamber volume.
*6:Based on EVO IX combustion chamber volume of 44cc, it will rise listed C/R value by 0.2 :i.e. 8.6→8.8