CP Forged Pistons Subaru WRX EJ255 2.5L 100mm +0.5mm -14.9 cc 9.4:1

SKU
SC7427
$885.15
Available

Description


CP Standard Shelf Pistons
Features

  • Dedicated forgings
  • Balanced to + or 1 gram
  • Wrist pins provided at no cost
  • Pin fitting provided at no cost
  • Accumulator Grooves
  • Dual forced pin oilers
  • Pick lock grooves
  • Fully CNC machined
  • USA Made

Pistons come with wrist pins, pin fitted, and locks.

CAM AND BARREL
The Cam is the shape around the skirt of the piston and the barrel is the shape from under the oil ring to the bottom of the skirt. Extensive research and development has been done to find the optimum skirt shape for each piston. These shapes have been found to seal up cylinders and reduce harmonics in the bore better than ever before. Depending on the forging and application, different cam and barrel profiles are utilized for maximum performance. Having the correect cam and barrel on a part promotes the following:
1. Tighter clearances
2. Less noise
3. Better ring seal
4. More power
5. Increased durability

ANTI DETONATION GROOVES (CONTACT REDUCTION GROOVES)
Also know as contact reduction grooves, which limit the piston/cylinder contact during high temperature and high RPM. These grooves also protect the top ring by disrupting detonation waves.


ACCUMULATOR GROOVE
V-shaped groove machined in the 2nd ring land that adds to the volume between the top and second ring. This groove accumulates residual gasses from combustion which alleviates top ring flutter and premature second ring wear, improving ring seal.

DOUBLE PIN OILERS
Double Pin Oilers (opposed to single pin oilers), in conjunction with our annular reservoir, can add twice the amount of oil from the cylinder wall to the wristpin bore. This is a standard option on any piston that receives forced pin oiling.


BROACHES
Broaches are horizontal slots in the pinbore designed to allow oil to enter between the wristpin and pinbore. Broaches are also used to accommodate the wristpin shape under compression, as it can become somewhat oval and needs room in order to alleviate galling.

PIN FITTING
The pin bore is precision honed to attain an exact pin clearance. Depending on the application clearances typically range from .0003 to as much as .003 between the wristpin and pin bore.

Specifications

More Information
Availability New In Stock / Available
Note This is a full set of Pistons, Rings, Pins, and Locks
Item Weight 408 g
Shipping Weight (Dimensional) 6.000000
Clearance Sale No
Availability Available
Part Type Pistons
Make Subaru
Vehicle Model Impreza WRX
Model WRX 06-07 GD, WRX 06-07 GG, WRX 08-14 GR
Engine EJ255
Rod Length 5.137" / 130.5mm
Rod Length Oversize Standard Length
Bore Diameter 100mm
Bore Oversize 0.020" / 0.5mm
Stroke 79mm (Standard Stroke)
Compatible with Stock Sleeves Yes
Requires Aftermarket Sleeves No
Compression Ratio 9.4:1
Compression Ratio Range 9.0:1 - 10.0:1
Pin Size 0.905" / 23mm
Upgraded Pin (not included) 905-2500-26CP3S
Included Ring Set RS1658-3937-0
Included Pin 905-2500-18CP1S
Head cc 52 cc
Dome cc -14.9 cc
Compression Height 1.208" / 30.7mm
Brand CP Pistons
Skirt Type Full Round
Piston Material 2618
Carb Legal Unspecified
Wrist Pin Wall Thickness 0.180"
Wrist Pin Dimensions .905" x 2.500" x .180"
Pin Material 5100 Chrome Moly Steel

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