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While looking at the posts on cooler fuel being better, i got to thinking about how we used to cool our intake charge. First let me say that this was with engines running carbs. on open wheel cars, however it should work on C-4s.
We used what was commonly called cool cans, a coffe can with steel fuel line coiled up inside mounted to the fire wall filled with ice, dry ice works better, they used to be in jegs/summit, don't know if they still are. On a well dailed in bracket car there could be a 1-3 thenths change in et, everything else being equal.
It's a cheap thing to try for a better et,...if your class will let you run it. One thing to remember is to remain constant, don't run out of ice, dry ice is better, i used to have three of them and would fill them with water and freeze them, using quick release fittings and the can mounted with pins. If you try it let us know how it works under a hot C-4 hood.
I am too, it's a different type of delivery and a different volume of fuel, but it is cheaper than most of the stuff out there promising that magical 2 tenths increase.
Cool cans went the way of the hula hoop for a reason. And not because they were good for 1-3 tenths. Whatever the minor benefit they provided in a carbed car, it would be substantially less in our flow through, constantly circulating, FI, fuel systems. Our gasoline doesn't have to slowly make it's way through fuel lines sitting on top of a hot engine and heat soak in carb fuel bowls. They have fallen out of favor for good reason.