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Originally Posted by GasperG
I mean how hard is for Audi to make a lighter and smaller engine with the same power? BMW will have a diesel engine with 127.3 hp per litre of displacement in a NORMAL ROAD CAR. Add a bigger turbo with MGU-H to handle the turbo lag and there you have it.
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With the new regulations, the primary requirement for engine department is brake specific fuel consumption: more power with the same fuel or same power with less fuel.
Audi could have gone smaller. The 2013 engine was smaller than this year (3.7 vs 4.0) and put out more power. Yet the Audi engineers believe that more displacement and more boost is a better way to improve the efficiency.
Engine weight is only a secondary requirement. Anyway it turns out the new engine is a bit lighter than last year:
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Far from being an evolution, the V6 engine is completely new. ‘It is a brand new rulebook; the conception is completely new,’ says Ulrich Baretzky, head of engine design at Audi. ‘We could never do for 2014 what we did from 2012-2013. That would be the wrong way to go. We always have to save weight, but I don’t know how much we saved. The most important thing about the engine is that it has to last. We have saved some kilos, but we are not in Le Mans yet, tests are not finished yet, we have to wait until it is done.’
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source:
http://www.racecar-engineering.com/cars/audi-lmp14/