Updated: Nov 17, 2019
The Richard Sohn Adapter kit or better the rx8 2 stroke oil conversion kit, is one of the most famous & useful mods to add to your rx8.
The reason behind the use of this mod goes back the design of the series 1 Renesis rotary engine.
The main issue of the rx8 engine is wear. In order to reduce wear, Mazda added an oil injector system that is powered by an oil metering pump (OMP). Depending on the engine load, this pump pumps oil in the combustion chamber in order to increase lubrication of the apex seals and rotors, thus prolonging their life and making the engine last longer.
Top 3 lubrication issues with the stock Renesis engine:
- Lack of lubrication
- Quality of lubrication
- Engine oil restrictions
Mazda put only 2 oil injectors, which didn't turn out to be enough. On top of that, the OMP pumped the existing dirty engine oil inside the chamber, that increased carbon deposits.
And if this wasn't enough, mineral oil was the only "safe" oil you could put in the engine, as it burned cleaner than full synthetic oils, which are more resilient to heat and because of that leave more deposits.