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Old 07-20-2008, 05:04 AM   #4 (permalink)
justpassntime
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Join Date: Jun 2008
Location: Eastern Washington
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The Japillac - '87 Honda Accord LXi Sedan
90 day: 31.77 mpg (US)

Ranchero GT - '73 Ford Ranchero GT

Spaz - '83 Chevy S10 4X4 Tahoe
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Quote:
Originally Posted by ecotoy View Post
Filters aside, I think the theory about the aftermarket air in-take kits is that they allow more air in-take that brings in more oxygen into the combustion chamber. More oxygen allows for a higher percentage of the fuel to be burnt giving you more power and better gas mileage.

All this is assuming that the unburnt fuel left behind by the current fuel-air mixture is significant enough so that when the extra oxygen helps it burn, you see a measurable difference in MPG/BHP.

I think broader air in-take and exhaust have always been used by performance modders to improve fuel combustion. Better fuel combustion should also improve MPG.

Not sure how all this plays out with modern car electronics.
I used to think that also but, it has been brought to my attention recently, if you have more oxygen the ecu just adds more fuel to maintain the correct A/F ratio. A larger filter would allow the engine to breathe better through the reduction of the restriction of air flow.

In the carburetor world it may work but not the electronic fuel injected one.
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