JE Pistons BMW S14B23 8.5:1 KIT Set of 4 Pistons

SKU: JEP321358

Engine Piston Kit

JE Piston Sets -4 Cyl...

JE Pistons

JE Pistons BMW S14B23 8.5:1 KIT Set of 4 Pistons

SKU: JEP321358

Engine Piston Kit

JE Piston Sets -4 Cyl...

Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

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Description

Sport Compact, Import and European forged pistons from JE Pistons are the result of over 75 years of industry leading experience extended to our range of premium forged pistons for BMW S14B23 Engines. JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From drift track to drag strip, JE Pistons’ performance is proven in victory lane time and time again. Equipped with the following custom level features

Product Overview

As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its wide range of premium forged pistons for European, import and sport compact applications. Engineered, forged and machined 100% in the USA, JE Pistons are designed for each specific engine and racing application to provide the ultimate combination of durability and performance. From drift track to drag strip, JE Pistons? performance is proven in victory lane time and time again. Equip your engine with the best in forged pistons.

Features and Benefits

Forged in the USA using 2618 aluminum, yielding high tensile strength needed for high-demand performance applicationsDesigned specifically for each engine and use application to provide optimized performance durabilityProprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pinSkirt coating (depending on application) reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noiseAccumulator groove (depending on application) helps reduce pressure from combustion gases, reducing ring fluttering and improving ring seal for consistent powerIncludes high-quality wrist pins, locks, and JE Pro Seal premium piston ringsMade 100% in the USA

Product Details

Add-On:	866-063-MW
Bore Diameter - Web:	93.80 MM
Bore Diameter:	93.80
Category Hierarchy:	Auto>JE Pistons>Piston Kits>European
Compression Height:	1.260
Cylinder Head:	BMW S14B23
Description:	JE Pistons BMW S14B23 8.5:1 KIT Set of 4 Pistons
Engine - Web:	S14B23
Engine Type:	ICE
Engine:	S14B23
Forging Type:	FSR
Industry:	Automotive
Make - Web:	BMW
Make:	BMW
Oil Ring Thickness:	0.111
Out of Stock Message:	Please Allow Approximately 3 Weeks or Less for Shipping
Part Number:	jep321358
Piston Average Weight:	372
Piston Head Type:	Dish
Piston Material:	2618
Piston Quantity:	4
Piston Series:	JE Pistons
Piston Volume:	-23.40
Product Market:	European
Product Type:	Engine Piston Kit
Prop 65 (C, R or CR):	CR
Prop 65 - Short Label:	Prop 65 Warning Label.JPG
Prop 65 Yes/No:	Yes
Ring Set Included:	Yes
Second Compression Ring Thickness:	0.0480
Title - Web:	JE Pistons BMW S14B23 Piston Kit - 93.80 mm Bore - 1.260 in. CH, -23.40 CC
Title:	JE Pistons - BMW, S14B23, 93.80 mm Bore, Piston Kit
Top Compression Ring Thickness:	0.0400
Wrist Pin Length:	2.250
Wrist Pin Material:	5115 Low Carbon Steel, Case Hardened
Wrist Pin Outer Diameter:	0.866
Wrist Pin Wall Thickness:	0.150

Application Summary

BMW M3 Base United States S14B23

Part Type

Engine Piston Kit

Data: v4.2 - Upd: 2026-10-14 05:51:02

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 BMW S14B23 Engines. To provide optimized performance durability
Forged in the USA using 2618 aluminum, yielding tensile strength and minimal thermal expansion
Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
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.
Proprietary Forged Side Relief (FSR) forging design minimizes friction and power loss with reduced skirt width and saves additional weight with a shorter wrist pin
Smooth Crown Finish: Deburs all areas around the valve pocket and dome area, to reduces stress risers and prevent hot spots.

Specifications

Add-On:: 866-063-MW
Bore Diameter - Web:: 93.80 MM
Bore Diameter:: 93.80
Category Hierarchy:: Auto>JE Pistons>Piston Kits>European
Compression Height:: 1.260
Cylinder Head:: BMW S14B23
Description:: JE Pistons BMW S14B23 8.5:1 KIT Set of 4 Pistons
Engine - Web:: S14B23
Engine Type:: ICE
Engine:: S14B23
Forging Type:: FSR
Industry:: Automotive
Make - Web:: BMW
Make:: BMW
Oil Ring Thickness:: 0.111
Out of Stock Message:: Please Allow Approximately 3 Weeks or Less for Shipping
Part Number:: jep321358
Piston Average Weight:: 372
Piston Head Type:: Dish
Piston Material:: 2618
Piston Quantity:: 4
Piston Series:: JE Pistons
Piston Volume:: -23.40
Product Market:: European
Product Type:: Engine Piston Kit
Prop 65 (C, R or CR):: CR
Prop 65 - Short Label:: Prop 65 Warning Label.JPG
Prop 65 Yes/No:: Yes
Ring Set Included:: Yes
Second Compression Ring Thickness:: 0.0480
Title - Web:: JE Pistons BMW S14B23 Piston Kit - 93.80 mm Bore - 1.260 in. CH, -23.40 CC
Title:: JE Pistons - BMW, S14B23, 93.80 mm Bore, Piston Kit
Top Compression Ring Thickness:: 0.0400
Wrist Pin Length:: 2.250
Wrist Pin Material:: 5115 Low Carbon Steel, Case Hardened
Wrist Pin Outer Diameter:: 0.866
Wrist Pin Wall Thickness:: 0.150

Reference Information

Brand Name/s	JE Pistons
StreetFX SKU	jep321358
SFX Item ID	4361333
Supplier Item Code	4361333
Manufacturer SKU	321358
Manufacturer UPC	193564047625
Alternative References	S14B23