I was just thinking ..."how many laps until the driver starts to feel the affects of CO poisoning?"... What a fabulous, purpose built automobile. Old touring cars and racers are just amazing to me... the shear size of the engine for so little output, the fact that they were so "hand made" and the wonderful engineering of their day... metallurgy and stuff like combustion chamber design or engine balance was still so far away from what even a novice engine builder today benefits from.