for manufacters like mercedes not involved in LMS/ALMS/WEC a sort of engine supplying is possible only as "recycle" of engines planned and developed from other competitions, as happnede this year with the RV8LM toyota or VK45 nissan sgt500 engines. Is really hard to think that a manufacter will project and develope a brand new engine just to selling it to private teams! A think like this can be done just by zytek or judd who are companies that have their main business in this.
Then a situation like the early '90 where f1 engines were shared by prototypes (because there was not groupC anymore) is impossible now.
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