JE Pistons Ultra Series Subaru EJ257 99.75mm Bore 9.5:1 CR Set of 4 Pistons
JE Pistons Ultra Series Subaru EJ257 99.75mm Bore 9.5:1 CR Set of 4 Pistons
A$2,163.87
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Description
Ultra Series forged pistons from JE are the industry’s strongest, most fully featured pistons available off the shelf. Offered for Subaru STI EJ257 Engines. Ultra Series Pistons feature JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with the following custom level features
Product Overview
Ultra Series forged pistons from JE are the industry’s strongest, most fully featured pistons available off the shelf. Offered for Subaru STI EJ257 Engines. Ultra Series Pistons feature JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with the following custom level features
Features and Benefits
- JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds.
- Designed specifically for Subaru STI EJ257 Engines. To provide optimized performance durability
- Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
- Made 100% in the USA
- Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
- Smooth Crown Finish: Deburs all areas around the valve pocket and dome area, to reduces stress risers and prevent hot spots.
- Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
- Thermal Crown: Applied to the piston crown, this thermal barrier coating reflects heat back into the combustion chamber to improve exhaust gas velocity and scavenging while reducing heat transfer to help extend piston life.
- Lateral Gas Ports: This process mills slots into the top of the top ring groove and provides a pathway for combustion pressure to get behind the top ring. Resulting in increased ring seal and is most common in circle track applications.
- Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise
Product Details
| 2nd Groove Width: | 0.048 |
|---|---|
| 3D Undercrown Milling: | No |
| Accumulator Groove: | Yes |
| Add-On: | JG4901-3927 |
| Anodize Top Ring Groove: | No |
| Bore Diameter: | 99.75 |
| Combo 2: | No |
| Compression Height: | 1.209 |
| Compression Ratio: | 0.37847222222222 |
| Connecting Rod Length: | 5.138 IN |
| Contact Reduction: | No |
| Cylinder Head: | EJ257 STI |
| DVGP: | No |
| Description: | JE Pistons Ultra Series Subaru EJ257 99.75mm Bore 9.5:1 CR Set of 4 Pistons |
| Double Pin Oilers: | No |
| EN Plating: | No |
| Econo Undercrown Milling: | No |
| Engine Displacement: | 2457 |
| Engine Stroke: | 3.110 |
| Engine Type: | ICE |
| Engine: | EJ Series |
| Exhaust Angle: | 22 |
| Exhaust Depth: | .230 |
| Exhaust Diameter: | 1.550 |
| Forging Type: | FSR |
| Gas Distribution: | No |
| Industry: | Automotive |
| Intake Angle: | 22 |
| Intake Depth: | .230 |
| Intake Diameter: | 1.550 |
| Lateral Gas Ports: | Yes |
| Make: | Subaru |
| Mill Undercrown: | No |
| Oil Groove Width: | 0.09950 |
| Oil Ring Thickness: | 0.0995 |
| Part Number: | jep361331 |
| Pin Fit: | Yes |
| Piston Average Weight: | 428 |
| Piston Head Type: | Dish |
| Piston Material: | 2618 |
| Piston Series: | JE Ultra Series |
| Piston To Wall Clearance: | -0.004 |
| Piston Volume: | -7.30 |
| Product Market: | Sport Compact |
| Product Type: | Engine Piston Kit |
| Prop 65 (C, R or CR): | CR |
| Prop 65 Yes/No: | Yes |
| Ring Set Included: | Yes |
| Second Compression Ring Thickness: | 0.0480 |
| Skirt Coat: | Yes |
| Smooth Crown Finish: | Yes |
| Thermal Crown: | Yes |
| Top Compression Ring Thickness: | 0.0475 |
| Top Groove Width: | 0.04750 |
| Tuff Skirt: | No |
| Ultra Dome: | No |
| Ultra Groove Plus Gas Port: | No |
| Ultra Groove: | No |
| Vertical Gas Ports: | No |
| Wrist Pin Length: | 2.250 |
| Wrist Pin Material: | 9310 Nickel Carbon Steel Alloy |
| Wrist Pin Outer Diameter: | 0.905 |
| Wrist Pin Wall Thickness: | 0.210 |
Application Summary
Subaru EJ257
Part Type
Engine Piston Kit
Features
- Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
- Designed specifically for Subaru STI EJ257 Engines. To provide optimized performance durability
- Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
- JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds.
- Lateral Gas Ports: This process mills slots into the top of the top ring groove and provides a pathway for combustion pressure to get behind the top ring. Resulting in increased ring seal and is most common in circle track applications.
- Made 100% in the USA
- Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
- Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise
- Smooth Crown Finish: Deburs all areas around the valve pocket and dome area, to reduces stress risers and prevent hot spots.
- Thermal Crown: Applied to the piston crown, this thermal barrier coating reflects heat back into the combustion chamber to improve exhaust gas velocity and scavenging while reducing heat transfer to help extend piston life.
Specifications
- 2nd Groove Width:
- 0.048
- 3D Undercrown Milling:
- No
- Accumulator Groove:
- Yes
- Add-On:
- JG4901-3927
- Anodize Top Ring Groove:
- No
- Bore Diameter:
- 99.75
- Combo 2:
- No
- Compression Height:
- 1.209
- Compression Ratio:
- 0.37847222222222
- Connecting Rod Length:
- 5.138 IN
- Contact Reduction:
- No
- Cylinder Head:
- EJ257 STI
- DVGP:
- No
- Description:
- JE Pistons Ultra Series Subaru EJ257 99.75mm Bore 9.5:1 CR Set of 4 Pistons
- Double Pin Oilers:
- No
- EN Plating:
- No
- Econo Undercrown Milling:
- No
- Engine Displacement:
- 2457
- Engine Stroke:
- 3.110
- Engine Type:
- ICE
- Engine:
- EJ Series
- Exhaust Angle:
- 22
- Exhaust Depth:
- .230
- Exhaust Diameter:
- 1.550
- Forging Type:
- FSR
- Gas Distribution:
- No
- Industry:
- Automotive
- Intake Angle:
- 22
- Intake Depth:
- .230
- Intake Diameter:
- 1.550
- Lateral Gas Ports:
- Yes
- Make:
- Subaru
- Mill Undercrown:
- No
- Oil Groove Width:
- 0.09950
- Oil Ring Thickness:
- 0.0995
- Part Number:
- jep361331
- Pin Fit:
- Yes
- Piston Average Weight:
- 428
- Piston Head Type:
- Dish
- Piston Material:
- 2618
- Piston Series:
- JE Ultra Series
- Piston To Wall Clearance:
- -0.004
- Piston Volume:
- -7.30
- Product Market:
- Sport Compact
- Product Type:
- Engine Piston Kit
- Prop 65 (C, R or CR):
- CR
- Prop 65 Yes/No:
- Yes
- Ring Set Included:
- Yes
- Second Compression Ring Thickness:
- 0.0480
- Skirt Coat:
- Yes
- Smooth Crown Finish:
- Yes
- Thermal Crown:
- Yes
- Top Compression Ring Thickness:
- 0.0475
- Top Groove Width:
- 0.04750
- Tuff Skirt:
- No
- Ultra Dome:
- No
- Ultra Groove Plus Gas Port:
- No
- Ultra Groove:
- No
- Vertical Gas Ports:
- No
- Wrist Pin Length:
- 2.250
- Wrist Pin Material:
- 9310 Nickel Carbon Steel Alloy
- Wrist Pin Outer Diameter:
- 0.905
- Wrist Pin Wall Thickness:
- 0.210
Reference Information
| Brand Name/s | JE Pistons |
|---|---|
| StreetFX SKU | jep361331 |
| SFX Item ID | 4358832 |
| Supplier Item Code | 4358832 |
| Manufacturer SKU | 361331 |
| Manufacturer UPC | N/A |
| Alternative References | EJ257, 99.75mm |
Compatibility
Subaru EJ257
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