Restrictor Question

[JAG]

If the Judd V10 was run as a 3 litre, would it be allowed significantly bigger restrictors than the 4l and 5l engines.

Seeing as these F1 derived engines can easily put out 600BHP+ at 3 litres, would this not be an option, at least for shorter races or qualifying.

[paul-collins]

There are smaller restrictors for larger displacements - see the ACO regs, page 15:

                        > 2 valves /cyl   2 valves /cyl  Rotary engines
# restrictors               1    2            1    2        1   2
< 3000 cm3                 47,8 34,1         49,4 35,3     52,5 37,5
3000 cm3 < disp < 3500 cm3 47,3 33,8         48,9 35,0     52,0 37,1
3500 cm3 < disp < 4000 cm3 46,8 33,4         48,4 34,5     51,4 36,7
4000 cm3 < disp < 4500 cm3 46,3 33,1         47,9 34,2     50,9 36,4
4500 cm3 < disp < 5000 cm3 45,8 32,7         47,4 33,8     50,3 35,9
5000 cm3 < disp < 5500 cm3 45,3 32,4         46,8 33,5     49,8 35,6
5500 cm3 < disp < 6000 cm3 44,8 32,0         46,3 33,1     49,2 35,1

http://www.lemans.org/univers_sport/...co_2004_gb.pdf

[jhansen]

Do the restrictor sizes change for turbo charged motors?

[paul-collins]

Well, not really: they go to pressure control instead. There are different sizes based on 1 or 2 restrictors, and 2 or more valves per cyl. But atmo varies between 3 bar for 2L motors, and 1.5 bar for 4L motors.

In the case of the diesel, it's 3.19 bar for the 5L motor, and a larger restrictor again.

Again, see page 15.

[Carse]

Putting a 3l engine in similar to an f1 engine for qualifying or a sprint race would just bring lots of problems and controversy when changing back to the gv5 engine wouldnt it?

And are there not a certain number of engine changes aloud in lmes?