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Hmmmm, again doing the sums with fuel at -18C…. Assuming an air to fuel ratio of 12:1 (by MASS) if the air is at 20C and fuel at -18C I work out the resultant intake temp to be reduced to 17C. Using this figure in the equation for heat engine efficiency it raises the value from 44.0% to 44.5%, so it’s a damn small increase. To get fuel into the intake at -18C would need not only a cold tank but chilled / insulated fuel pipes and carb, etc.
I’ve used fuel from various garages, used fuel up that has been left from one meeting to the next, etc, and never noticed any discernable difference. Maybe if everything is set up perfect and the driver is spot on then all the time then it might matter.
The things that are more important for us are that: our engines are in great shape, the carb is tuned in, we’re on the correct gearing, the chassis is set up right, the tyre pressures are what they should be, and the driver is driving well. When we get all this right we’ll be at the front anyway!!!! (dream on….)
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