49
PISTONS/PISTON RINGS/PISTON PINS
Pistons are made of aluminum alloy and have a slipper skirt, with a valve recess provided at the top of the piston. The
first ring increases initial conformity having a barrel face form, and the second ring increases oil run–off properties with
a tapered undercut form. The first ring is provided with chrome plating and has increased durability on the outer
circumference of the oil ring and on the outer circumference of the second ring in turbo models. A full floating type piston
pin is used, reducing friction.
1st Oil2nd
Model
Top part volume (cc) undercut
Outer diameter (mm)
Height from boss
center to top (mm)
Internal diameter of pin (mm)
Piston Specifications
Model
1
st
Ring
1.0
2.3
2
nd
Ring
1.2
2.6 or 2.7
Spacer Side Rail
Oil Ring
2.0
2.5
1.4
φ64.965~φ64.985
25.5
φ16.006~φ16.014
Piston Pin Specifications
Model
Pin outer diameter (mm)
Pin length (mm)
φ15.995 ~φ16.005
49.5
Piston Ring Specifications
Model
Width (mm)
Thickness (mm)
Form
Peripheral area plating
1.0
2.3
Barrel
face type
1.2
2.6 or 2/7
Tapered
undercut
type
2.0
2.5
Assembly
type
Yes YesNo
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