JE Pistons FSR Forged Piston Kit for Nissan SR20DET/SR20DE 86.5mm 8.5:1 - 298728

Nissan SR20DET / SR20DE | 86.5mm Bore | 8.5:1 | -13.60cc Dish | Forged 2618 | FSR | 22mm Pins | Set of 4

Building a Nissan SR20DET for more boost, a larger turbocharger, or a complete performance rebuild? The JE Pistons FSR Forged Piston Kit, part number 298728, provides a performance-focused piston package for the legendary Nissan SR20 engine platform. Whether you're rebuilding a worn SR20DET, repairing piston damage, or assembling a turbocharged SR20 project, these American-made forged pistons offer a strong foundation for a properly engineered engine.

Featuring an 86.50mm bore, 8.5:1 nominal compression ratio, and -13.60cc dished crown, this kit uses JE's forged 2618 aluminum construction and lightweight Forged Side Relief (FSR) design. Accumulator grooves help improve piston ring control under elevated cylinder pressures, while smooth crown finishing, precision wrist pin fitting, and coated skirts provide additional refinements for demanding street and track use. The complete set includes four pistons, JE Pro Seal piston rings, wrist pins, and retaining locks.

Key Features & Specifications:

Kit Includes:

• 4 x JE Pistons FSR Forged 2618 Aluminum Pistons

• JE Pro Seal Premium Piston Ring Set

• 4 x Case-Hardened 5115 Steel Wrist Pins

• Wrist Pin Retaining Locks

About the JE Pistons Nissan SR20DET Forged Piston Kit

Build a Stronger Nissan SR20 Turbo Engine

The Nissan SR20DET remains a popular engine for turbocharged street cars, drift builds, and track projects. When increasing boost pressure or rebuilding an engine that has seen years of hard use, choosing the right pistons becomes an important part of the overall engine build.

JE manufactures these pistons from forged 2618 aluminum, a material selected for its strength and ductility under demanding combustion conditions. The kit offers a performance-oriented alternative to standard replacement pistons for engine builders preparing an SR20 for more demanding use.

With an 86.50mm bore, these pistons are intended for cylinders finished 0.50mm larger than the original 86.00mm bore. The 8.5:1 nominal compression configuration and -13.60cc dished crown are especially relevant to turbocharged applications where piston geometry must be matched to the intended cylinder head and engine combination.

Lightweight Forged Side Relief Construction

JE's proprietary Forged Side Relief design uses a reduced skirt width to help minimize piston friction and unnecessary reciprocating weight.

The FSR design also accommodates a shorter wrist pin, helping manage piston assembly mass. With an average piston weight of 313 grams, this kit combines forged construction with geometry designed for performance applications.

For an SR20 that regularly experiences rapid RPM changes, frequent acceleration, and demanding track use, piston design and reciprocating weight are important considerations.

Accumulator Grooves for Improved Ring Stability

In a turbocharged engine, combustion gases passing the top piston ring can build pressure between the top and second rings.

JE's accumulator groove provides additional volume for these gases, helping reduce inter-ring pressure and minimize ring flutter. This supports more consistent top-ring sealing during elevated cylinder pressure operation.

It's a useful feature for SR20DET builds designed around increased boost and demanding driving conditions.

Smooth Crown Finish

The piston crowns feature JE's smooth finishing process, which removes sharp edges around the crown and valve relief areas.

Reducing these sharp transitions helps minimize potential hot spots and stress concentrations during combustion.

This feature complements the kit's dished crown design and makes it particularly relevant to carefully engineered turbocharged performance engines.

Coated Skirts and Precision Wrist Pin Fit

JE applies a specialized skirt coating to help reduce friction and wear between the piston skirts and cylinder walls while also helping limit operating noise.

The wrist pin bores are precision-honed to establish controlled pin-to-piston clearance. JE identifies typical pin-fit clearances ranging from 0.0003 to 0.0010 inches, with final measurements determined during assembly.

The included 22mm nominal steel wrist pins, retaining locks, and JE Pro Seal piston rings complete the package, giving builders the essential piston components needed for a properly prepared SR20 short block.

Whether you're rebuilding an SR20DET or developing a compatible SR20DE-based turbo project, JE Pistons 298728 provides forged construction, FSR design, accumulator grooves, coated skirts, and smooth crown finishing in a complete four-cylinder piston kit.

Fitment & Installation Notes:

• Nissan SR20DET: Intended for compatible 2.0L turbocharged SR20 engine builds.

• Nissan SR20DE: Potential application where cylinder head, connecting rod, wrist pin, and piston geometry match. The advertised 8.5:1 compression ratio should not be assumed for every naturally aspirated SR20DE configuration.

• Nissan Silvia / 180SX: Applicable to compatible SR20-equipped versions, subject to engine identification and dimensional verification.

• Nissan Pulsar GTI-R: Verify the exact SR20DET variant and piston compatibility before ordering.

• Nissan 240SX: Suitable only where a compatible SR20 engine has been installed. This is not a piston kit for the original KA-series engine found in US-market 240SX models.

• Required Finished Bore: 86.50mm.

• Bore Oversize: +0.50mm compared with the standard 86.00mm SR20 bore.

• Compression Ratio: Nominal 8.5:1 for the intended engine geometry. Actual compression depends on combustion chamber volume, head gasket thickness, and deck clearance.

• Piston Configuration: -13.60cc dished crown with 1.253-inch compression height.

• Wrist Pin Diameter: 0.866 in. (22mm nominal).

• Connecting Rod Compatibility: Verify connecting rod length, small-end dimensions, and wrist pin fit before assembly.

• Cylinder Machining: Measure the actual pistons and finish the cylinder bores to JE's specified piston-to-wall clearance.

• Ring Installation: Measure and set ring end gaps according to JE's recommendations for the intended fuel, boost pressure, and operating conditions.

• Piston-to-Valve Clearance: Check clearance during assembly, especially with aftermarket camshafts, modified cylinder heads, or altered valve timing.

• Engine Tuning: Fuel delivery, ignition timing, boost control, and ECU calibration should match the completed engine build.

• Horsepower Rating: No fixed horsepower limit is specified for part 298728. Overall engine capability depends on the complete engine assembly, machining, supporting components, and tuning.

The JE Pistons 298728 kit combines American-made forged 2618 aluminum construction, an 86.50mm oversize bore, lightweight FSR design, accumulator grooves, smooth crown finishing, and coated skirts for performance-focused Nissan SR20 engine builds.