IMSA Tries to Slow Down the R10 With Sanctions

IMSA has published a bulletin that affects the refuelling rig restrictor of diesel cars participating in the American Le Mans Series, specifically the Audi R10 TDI cars. The change limits the refuelling restrictor from the current 38mm permitted under the regulations to 33mm, with immediate effect.
Dr Wolfgang Ullrich, Head of Audi Motorsport:
"Of course we are not happy about changing the rules in the middle of the season after all the hard work we have done based on the original rules. The adjustment means that our refuelling stops will take several seconds longer because diesel has a higher viscosity and thus a lower flow speed. Originally, a larger diameter had been allowed for diesel engines to make sure that diesel and gasoline engines can be refuelled in the same amount of time.
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