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mine are blocked, but i do wonder if that drops mpg, and if it does, by how much? If the OP has careful mpg records before, i'd sure appreciate if he reports mpg AFTER. Thanks!
mine are blocked, but i do wonder if that drops mpg, and if it does, by how much? If the OP has careful mpg records before, i'd sure appreciate if he reports mpg AFTER. Thanks!
Blocking the exhaust crossover should actually help mileage if anything.
Some heat is needed to heat the intake itself. When the intake is cold, fuel clings to the surfaces, intake floor, valves. hard to mix with air. Usually runs rich without some heat.
In cooler damp weather you could get iceing in the intake making the engine run rough and run rich to the point you get black smoke out the exhaust
True, alot of aftermarket stuff does not have any passasge. You wouldn't want it for flat out performance. If the car is only driven when it's 80 out, block it.
Here in Ohio for spring & Fall driving it is nice to have some heat. If it's real cool, I hold the heat riser shut for a few. It quickly heats the intake & choke for a nice stable 750 rpm idle. When its 90 out, that's another story. Just my 2 cents.
yrs ago i did get carb ice even here in FLA 50F or below. added some heat off one header, no more ice.
so i'd say header heat is a reasonable substitute for the xover. Up north, i'd keep the xover for sure, but maybe only from one side to avoid hp loss.(block 1 side) (talk to guys up north)
with a 3" fan/duct for summer to keep the carb cool, other wise it will boil on hot soak.
The reason a hot intake can help mpg is the heat can help vaporize fuel. If, and how much, is why i'd like to see test results. Cold starts really suck gas! Some cars up north don't warm up fully for 5-20 miles. So there can be significant fuel savings overall.
Last edited by Matt Gruber; Oct 1, 2012 at 07:26 AM.
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In cooler damp weather you could get iceing in the intake making the engine run rough and run rich to the point you get black smoke out the exhaust
