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Originally Posted by Truckosaurus
So, these "production GT1 engines in LMP1" then...
It seems you can have a bespoke 6.0 race engine running 32.5mm restrictors, or a 4 valve per cylinder homologated engine (eg. Aston V12) using 33mm restrictors, or a 2-valve lump (eg. Chevy C6R based engine) using 34mm holes.
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I read it as 33.3mm, but then there follows this:
For an engine having more than 8 cylinders, the restrictors’ diameter above must be increased by:
- 0.6 mm for 1 restrictor,
- 0.4 mm for 2 restrictors;
For closed cars equipped with an air conditioning system, the restrictors diameter above must be increased by :
- 0.5 mm for 1 restrictor,
- 0.3 mm for 2 restrictors;
which would mean the Aston can use 34mm holes, a 9.4% increase in area over the GT1 engine, giving maybe 655hp. Nice, but still no Diesel!