Subaru EJ20 Normally Aspirated
Unusually this customer was converting a Subaru EJ20 turbo engine (similar to the one pictured, © Subaru UK Ltd) to normally aspirated induction.
The compression ratio required was 11.0:1, with a bore size of 93.50. The sample piston supplied was a standard EJ20 low-compression piston with a flat bowl and two valve relief slots. The finished piston has a raised intruder between the valve reliefs and has the correct volume to achieve a compression ratio of 11.0:1.
In addition to the sample piston, we needed the following information about the customer engine:
- Bore size
- Stroke
- Deck height /clearance
- Head gasket thickness
- Cylinder head chamber volume.
The SubaruEJ20 OE low compression piston and the finished forged high compression piston
Related products
Subaru EJ20 Non Turbo + 0.020"
Reference: Custom-21
Subaru EJ20 Non Turbo + 0.020 Made to order. Please enquire
Other Case Studies
Custom pistons for 6-cylinder Bentley
These pistons were custom-made using the original Bentley 6-cylinder piston for reference.
Read more
Velocette pistons
These pre-war Velocette 69.50mm pistons were made using an original sample for reference.
Read more
Renault Clio 2009 1.6 GT Turbo Conversion
Our customer had a normally aspirated Clio 1.6GT and wanted to fit a turbo kit to the car.
Read more
Triumph Stag custom pistons
Custom pistons supplied for the restoration of a classic British sports car – the Triumph Stag.
Read more
Mercedes 280
This Mercedes 280 piston is interesting in that it has a unique and complex non-symmetrical 3D intruder/dome.
Read more
VW Golf R MK7
This customer had a pretty serious blow up on his 2014 Golf R as the picture below shows, and was unable to find any replacement pistons.
Read more
Triumph T140V Motorcycle
A straight forward job where our customer needed some pistons for a Triumph T140V engine at 0.040” oversize, but was unable to obtain any.
Read more
BMW M42 Stroker
Our Customer wanted to change the stroke on his BMW M42 engine by fitting a longer stroke crankshaft from a later BMW engine. The finished pistons needed to suit a bore size of 86.50mm and give a compression ratio of 10.5:1. The stroke of the engine was changing from 81mm to 88mm.
Read more
Lamborghini V12 pistons
These Lamborghini 82mm pistons were made using an original sample for reference.
Read more