Supertech Forged Pistons & Rings - For MINI N14 Engines

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Supertech Forged Pistons are high quality, high strength and lightweight. Ideal for increasing the strength of the engine of the MINI N14 Cooper S and JCW engine. Available for delivery or can be fitted in-house as part of Lohen's MINI engine build packages.
Select Size (mm)

Compression Ratio

Manufacturer: SuperTech


Supertech pistons are forged from aluminium alloy for high performance and superior strength while maintaining low weight. Using a 4032 alloy (an aluminium alloy containing Silcon, nickel, magnesium & copper) the piston achieves a high temperature tolerance value meaning its deformation at high temperature is minimal. 

The Supertech N14 piston is supplied in a variatey of sizes to suit the needs of the engine i.e. if a bore is required due to scoring.

The pistons are also available in different compression ratios as follows:
10:1 for the N14 JCW engine
10.5:1 for the Cooper S engine
The 10:1 compression ratio can be installed into the Cooper S N14 also it is advisable to couple this ECU tune to ensure running and get the most out of the engine build. The piston is slightly shorter so there are no fouling issues when using the standard MINI camshaft. Other camshafts may require piston machining.

Why would you install Supertech forged pistons?

Forged pistons provide a stronger alternative to the standard piston found in the N14 Cooper S and JCW engine. The increased strength allows for a more durable engine and one that allows tuning to be pushed further iin a safer manner.

Please note: This kit includes a set of piston rings for each piston

Tech Specs

The Supertech pistons are suitable for the N14 MINI engine found in the Cooper S 2007 - 2010 and the JCW 2007 - 2012.

77 mm
Weight per piston 10:1 ratio 250 g 10.5:1 ratio 262 g
Oversize - standard size
Compression ration - available in 10.1 and 10.5:1
Volume CCS: Standard
Comp Heigh: 28.70 mm
Rod Lenght: Standard
Pin Diameter: 20 mm

77.5 mm 
Weight per piston 10:1 ratio 256 g 10.5:1 ratio 267 g
Oversize - 0.5 mm oversized
Compression ration - available in 10.1 and 10.5:1
Volume CCS: Standard
Comp Heigh: 28.70 mm
Rod Lenght: Standard
Pin Diameter: 20 mm


Q. Do I need new connecting rods?
A. No. These will run with the standard MINI connecting rods but they are suitable for use with Supertech forged connecting rods that will improve strength of the engine further.  

Whats in the box

4x Supertech forged pistons
4x Steel pins
4x Sets of Supertech piston rings

Fitting Details

Lohen offers in-house fitting for all products at our workshop in Eccleshall, Staffordshire, ST21 6JL. Here are the important things you need to know:

Fitting Cost - Installation labour starts from £699. Please call us to discuss your requirements, 01785 85 99 99. 

Fitting Time - From 2 days

Required Additional Items/Services - Block honing will be required to accommodate the forged piston regardless of size. 

Lohen Recommends - Discussing your optoins with our team to ensure that you get the most from your performance engine build. 

Returns & Refunds

Returns and Refund Policy - Refunds are available within 7 days after delivery for products that are unused and are in original packaging. Special order goods are non-refundable. Products that are damaged in transit to or from the customer can be refunded up to 14 days after the product has been delivered. Products returned to us in imperfect, non-resalable condition will not qualify for refund. Products that are faulty due to manufacturing process are refundable under the manufacturers' warranty for a limited time specified in the manufacturer's terms and conditions. These do not apply if the product has been fitted incorrectly or misused, motorsport use could further reduce the manufacturer's warranty. If an order is cancelled or refunded the buyer is responsible for the return of the goods to such address as directed by the supplier and is at the consumer's sole expense. This does not affect your statutory rights.


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