The idea of the major forms of racing all using a 2.0l engine in turbocharged and non-turbocharged forms is an interesting one.
The ACO's 2011 P1 engine rules have a 2.0l turbo engine with a maximum of 6 cylinders as their turbo option alongside NA (3.4l, maximum 8 cylinders) and diesel (3.7l twinturbo maximum 8 cylinders) options.
The future Indycar engine (when it arrives) will be a 2.0l turbo though they are undecided on the layout; Audi want an inline 4, Honda want a V6. I'd say let them both use whichever layout they want, there has been talk of them trying to work out an equivalency.
Super 2000 rally and touring cars use normally aspriated 2.0l inline 4s, as does Formula 3. One manufacturer's engine can be chosen for FIA F2.
Formula One wants to move to a small turbocharged format around 2012.
What I would suggest is that each manufacturer is allowed to build a 2.0l engine of whichever configuration they want, be it V, inline, flat and allow 4 to 8 cylinders (though I can't see many going above 6 cylinders).
This would allow the likes of BMW to make an inline 6, and Porsche a flat 6. I reckon that Honda, Toyota, Mercedes and GM would lean towards a V6.
I would leave the technology nice and open to things like direct injection, variable valve timing etc.
They can then adapt these engines to the various series, in turbo/non turbo form. and badge them differently i.e. VW in Indycar, Audi in sportscars and so on.
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