Description

RCM / Omega EJ22 Subaru Impreza Piston Set – 2.35 Stroker

RCM have always chosen Omega as their preferred piston manufacturer, not only because of their extensive experience within motorsport but also for the incredible accuracy and attention to detail that is applied to every aspect of their manufacturing.

So why forged?

A forging is still the best way to manufacture a piston, not just from a production point of view but for the strength of the piston. There are certain areas where a piston machined from solid is marginally better than a forging but the strength benefits of a forging far outweigh any benefits of a fully machined piston. You get excellent grain structure when a piston is forged correctly, the way Omega do it. In a fully machined piston you don’t get any true grain flow structure as you are using the material as it is cut from the bar. When you forge the material you create optimal molecular alignment within the material coupled with their own in-house bespoke heat treatment and this is what gives the piston its strength.

After discussions with the technical people at Omega and other metallurgists we are convinced that the companies who are promoting fully machined pistons cannot offer forgings, it is much easier and cheaper to buy a machine with 3D capabilities than it is to buy and set up a forging plant, then there is the experience and skill required to create the perfect forging, it isn’t easy, and certainly isn’t cheap but it provides the very best components available.

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