Quote:
Originally Posted by wws944
The air filter will keep out any bad stuff. However cold(er) air is all about power and fuel economy. Back in the olden days of carbs and compromised mixtures, warmer underhood air was probably desireable for general drivability. Especially in the 1970s and early 1980s, when they were going with leaner mixtures, so put the little heaters on exhaust manifold to thermostatically have a controlled source of warm air. But with closed-loop computer-controlled fuel injection, that is no longer an issue. The input air temp is monitored, and the mixture adjusted as appropriate.
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the colder the air the worse your fuel economy but the better the power, the denser the air, the more fuel added to keep a good fuel mixture going, the warmer the air the "leaner" the air mixture will be so fuel is subtracted.
and with carbs, the "thermostaticaly controled hot air" was used to help the engine run good (driveability) in cold temps. a cold engine will not like cold air. you realy noticed this on a wheeler or bike thats carbed and you try and crank on the throttle when its stone cold... falls on its face.
i run the WAI for fuel economy.