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CP Forged Pistons 4G64 7-Bolt w/ Evo 4-9 4G63 Head 87.5mm +1.0mm -20.9 cc 8.5:1 88mm Stroke Long Rod
SKU
SC7259
$885.15
Call
Not in stock, but we will contact the manufacturer and other warehouse distributors to find out how quickly we can get it to you.
Description
CP Forged Pistons 4G64 7-Bolt w/ Evo 4-9 4G63 Head 87.5mm -20.9 cc 8.5:1 88mm Stroke Long Rod
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 (except for Subaru).
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
| Item Weight | 337 g |
| Shipping Weight (Dimensional) | 5.000000 |
| Clearance Sale | No |
| Availability | Call |
| Part Type | Pistons |
| Make | Mitsubishi |
| Vehicle Model | Evo 4 5 6 7 8 9 |
| Model | Evo 4-6 CP9A, Evo 7-8 CT9A, Evo 9 CT9A |
| Engine | 4G64 (7-Bolt) |
| Rod Length | 6.142" / 156mm |
| Rod Length Oversize | 0.237" / 6.0mm |
| Bore Diameter | 87.5mm |
| Bore Oversize | 0.040" / 1.0mm |
| Stroke | 88mm (De-Stroker) |
| Compression Ratio | 8.5:1 |
| Compression Ratio Range | 8.0:1 - 9.0:1 |
| Pin Size | 0.866" / 22mm |
| Upgraded Pin (not included) | 866-2250-25CP3C |
| Included Ring Set | CPN-3445 |
| Included Pin Locks | 866x063 SWL |
| Included Pin | 866-2250-18CP1C |
| Head cc | 43 cc |
| Dome cc | -20.9 cc |
| Compression Height | 1.370" / 34.8mm |
| Brand | CP Pistons |
| Skirt Type | Full Round |
| Piston Material | 2618 |
| Engine Head | 4G63T (7-Bolt Evo 4-8), 4G63T (7-Bolt Evo 9) |
| Carb Legal | Unspecified |
| Wrist Pin Wall Thickness | 0.180" |
| Wrist Pin Dimensions | .866" x 2.250" x .180" |
| Pin Material | 5100 Chrome Moly Steel |
| Shipping Label | Free Shipping |
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