Engines and Components› Pistons and Piston Rings

Mahle

Forged Piston Kit, 1.6L N14

$899.12

SKU: 21bmw155

Special Order
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The Mahle 21bmw155 is a pistons-kit designed for the Mini Cooper S N14 1.6L engine. It offers OEM fitment and wear characteristics for quiet operation and ideal compression. Features include durable forged pistons, a lightweight design, high-strength German steel wrist pins, and a proprietary Mahle low-expansion alloy.
Show original supplier description
The Mahle 21bmw155 is a performance pistons-kit engineered for the Mini Cooper S N14 1.6L engine, offering a balance of industry-leading features, OEM fitment, and wear characteristics. These pistons are recommended for high-performance engine builds, providing enhanced strength and longevity. Key features of this Mahle piston set include quiet operation, an ideal compression ratio and dish shape, and a durable forged piston construction. The kit incorporates high-strength German steel wrist pins to support high horsepower applications and utilizes Mahle's proprietary low-expansion 142P alloy. To minimize blow-by and maximize power output, tight ring-to-piston groove clearances are implemented, achieved through hard anodized top ring lands that prevent micro-welding. The Grafal anti-friction skirt coating and oil squirter notches further contribute to engine longevity and performance. Specifications for this pistons-kit include a bore of 77.50 mm, a compression ratio of 10.3, and a pin size of 20 mm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandMahle
Part Number21bmw155
CategoryEngines and Components

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy