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Original Message
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| RE: More of a materials problem. |
| By Gerry Proctor - 01/29/2004 12:56:49 PM; IP 207.133.188.254 |
Aluminum intakes are better conductors of heat than iron intakes. You can, with some tuning and behavior changes, get away from the heat riser on an aluminum intake even in colder climates since the intake heats up much faster -even without a crossover- than an iron piece.
Of course there is a downside, as you point out, in the summer time. All of that heat conducted has to go somewhere and a carburetor with a heat sink like fuel is as good a place as any. If I recall my physics, that's how it works anyway. Using a wood or phenolic insulator under the carb goes a long way to solving the percolation issue whether your aluminum intake has a crossover or not.
If your fuels do use alcohol as either a supplement for volume or as an oxygenate, it does have an effect and the more heat you have on the plenum, the easier your fuel will vaporize since alcohol will not vaporize below 60-degrees. But more than anything, it just screws up the A/F ratio. |
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