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CP Forged Pistons with HD Pins Subaru BRZ Scion FR-S FRS FA20 4U-GSE 86mm STD Bore -18.3 cc 9.0:1
SKU
SC7402-250
$1,089.15
Available
Not in stock at our Sanford, FL location but electronically verified in stock at the Manufacturer/Distributor within the last 12 hours. (aka: not experiencing a supply delay)
Description
CP Pistons is one of the most trusted names in the industry, and for good reason. Their extensive shelf catalog provides the user with many of the options that you'd normally be resigned to going to a custom piston for. Their standard offering already includes Dual Pin Oilers - providing double the amount of oil to the wrist pin, radiused valve reliefs and the pin fitting final hone on the wrist pin bore. They even include an Accumulator Groove as a standard option. This provides a small pocket for the combustion gasses to collect after the first ring, reducing ring flutter and providing a better seal allowing more downward force on the piston A.K.A. - make more power.
All pistons come balanced within one gram, include pin lock grooves and wrist pins at no additional charge.
All pistons come balanced within one gram, include pin lock grooves and wrist pins at no additional charge.
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
| Availability New | In Stock / Available |
| Note | This is a full set of Pistons, Rings, Pins, and Locks Includes 0.250" Wall Wrist Pin Upgrade. |
| Item Weight | 320 g |
| Shipping Weight (Dimensional) | 7.360000 |
| Clearance Sale | No |
| Availability | Available |
| Part Type | Pistons |
| Make | Scion, Subaru, Toyota / Lexus |
| Vehicle Model | BRZ / FR-S / 86 |
| Model | FR-S 13-16 ZN6, BRZ 13-20 ZC6 |
| Engine | 4U-GSE, FA20 |
| Rod Length | 5.090" / 129.3mm |
| Rod Length Oversize | Standard Length |
| Bore Diameter | 86mm |
| Bore Oversize | Standard Bore |
| Stroke | 86mm (Standard Stroke) |
| Compatible with Stock Sleeves | Yes |
| Requires Aftermarket Sleeves | No |
| Compression Ratio | 9.0:1 |
| Pin Size | 0.866" / 22mm |
| Included Ring Set | CPN2-3386 |
| Included Pin Locks | 866x063 SWL |
| Included Pin | 866-2250-25CP3C |
| Dome cc | -18.3 cc |
| Compression Height | 1.292" / 32.8mm |
| Brand | CP Pistons |
| Skirt Type | Full Round |
| Piston Material | 2618 |
| Carb Legal | Unspecified |
| Wrist Pin Wall Thickness | 0.250" |
| Wrist Pin Dimensions | .866" x 2.250" x .250" |
| Pin Material | 9310 Steel |
| Shipping Label | Free Shipping |
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