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.
Omega’s attention to detail?
CNC (Computer Numeric Controlled) machines are used to do most of the machining that turns a forging into a piston. When finished, the piston is sent to the quality control department to be measured. The quality control department is kept at a constant 20.5°C, important as pistons can expand by as much as 10 microns in sunlight. This way the pistons can also be measured for tolerance anywhere in the world, provided the same 20.5°C conditions are replicated.
The piston skirt is designed and machined to give a profile that works most efficiently when the engine is at full working temperature. Piston skirt profiles are not round but elliptical in shape and barrelled in length. The machining of the skirt is done on extremely accurate machines, capable of holding their repeatability down to 5 microns!
All RCM / Omega Pistons are individually weighed and batched to within 0.5 grams, which ensures that a set of four will have a tolerance deviation of no more than 2.0 grams. On large orders this means that it is not unusual to have a set of 4 pistons with only 0.1 gram deviation!
Both Gobstopper I and II have always used Omega pistons. With both cars developing over 700bhp (plus the additional option of nitrous oxide) and a rev limit of 10,000 rpm you don’t get a greater test for any piston. Omega pistons have always performed faultlessly even under the most extreme of conditions which is why when choosing our preferred manufacturer we wouldn’t look anywhere else.
- Increased compression ratio over the standard EJ25 STI pistons.
- Forged from 2618A Aerospace Alloy for the ultimate strength.
- Weighed and batched to within 0.5 grams for the perfect balance.
- Manufactured by Omega, world class leaders within piston design and manufacture.
- Complete kit, supplied with new piston ring set, gudgeon pins and circlips.
- Pistons sits 0.30mm down the bore on a 79mm crankshaft
- Retains original bowl volumes (11cc) and shape of the EJ25 STI piston only with a higher deck height.
- 9.481:1 CR using the standard EJ25 STI cylinder heads and 0.6mm head gasket.
- 10.156:1 CR using EJ20 STI (single VVT) cylinder heads and 0.6mm gasket.
- Forged from 2618A aerospace alloy.
- CNC machined at a constant 20.5°C
- Weighed and batched to within 0.5 grams
- Piston sets are supplied with piston rings, gudgeon pins and circlips
- Standard 99.50mm RCM2493
- +0.25 99.75mm RCM2494
- +0.50 100.0mm RCM2495