JE-Pistons kit Honda L15B7 73.00mm 10.3:1
This is an English version of the earlier JE‑357429 description, in a style suitable for a product page.
Product headline
JE Pistons 357429 – forged piston set Honda L15B7 turbo 73.00 mm
The JE 357429 kit is a forged piston solution for modern Honda L15B/L15B7 turbo engines, engineered for higher boost, increased rev limits and aggressive calibration on pump fuel or E85. Manufactured from high‑strength 2618 forged aluminum, with a performance‑oriented crown design and low‑friction skirt coating, these pistons provide a safe foundation for power levels far beyond the stock 1.5T capabilities found in Civic and CR‑V applications.
Key features
- 2618 forged aluminum construction for excellent detonation resistance and thermal stability in high‑boost, motorsport environments.
- Optimized crown volume for a 10.3:1 compression ratio (approximate) with stock L15B7 head and stroke, supporting fast turbo spool and high efficiency with proper tuning and fuel.
- Graphite/moly skirt coating to reduce friction, cold start noise and cylinder wall wear, improving street drivability and long‑term reliability.
- High‑strength wrist pins included, designed to handle substantially higher cylinder pressures and RPM compared to factory components.
- Complete ring set included, with ring profiles and tensions tailored to modern turbo engines and precise ECU calibration.
Typical applications
- Street/track builds based on Honda Civic 1.5T (L15B7) with increased boost, hybrid turbochargers and custom ECU calibration.
- High‑output 1.5 turbo engines for time attack, track day and sprint racing, where stock pistons are a limiting factor.
- Engine rebuilds and upgrades where the goal is to increase power and durability under continuous heavy load compared to OEM components.
Technical specifications
Parameter | Value (descriptive) |
Engine | Honda L15B / L15B7 turbo |
Bore diameter | 73.00 mm |
Compression ratio* | Approx. 10.3 : 1 |
Material | 2618 forged aluminum |
Number of pistons | 4 pcs |
Wrist pin diameter | OEM‑style for L15B7, full‑floating pin setup |
Ring grooves | 1.0 / 1.2 / 2.8 mm (typical JE sport layout) |
* With stock stroke and combustion chamber of the L15B7 engine.
Kit contents
- 4 × JE Pistons 357429 (Honda L15B/L15B7 turbo)
- 4 × wrist pins + locking clips
- Complete piston ring set matched to the groove dimensions
- Installation sheet with recommended clearances and torque specs
Installation notes
- Set piston‑to‑wall clearance according to JE’s recommendations for 2618 alloy pistons – closer to the minimum for street use, larger for high‑boost, race‑focused builds.
- Gap the rings according to target boost pressure and fuel type (pump fuel vs E85); higher boost and higher temperatures require larger end gaps.
- Check valve‑to‑piston clearance when using aggressive camshafts and altered cam timing; verify minimum safe clearance across the full RPM range.
- Use high‑quality engine oil suitable for elevated temperatures and extended high‑load operation, and shorten service intervals for high‑power applications.