Cooling the air-fuel mixture?
(2011-12-24 15:20:24) 1. Says: If you could cool the air-fuel mixture in an internal combustion engine cylinder to enable higher compression, would that result in an increase in engine efficiency (lower fuel consumption, better mileage)?2. Says: No. A cooler charge would be more dense. More oxygen molecules would require more fuel molecules to achieve the 14.7:1 stoichiometric ratio for the best compromise between efficiency and power. The engine computer measures intake air temperature and the volume of air entering the engine and precisely injects the proper amount of fuel. The computer would "see" the change in temperature and adjust the mixture accordingly.There are ways around this, but the gains are not nearly enough to offset the cost of modifications to effectively increase efficiency.3. Says: K.&.N.offers a cold air intake system that i have used with good results.and if you increase the exhaust system(Magna flow)you will have and in and out at a higher flow rate which fits what you are discussing.i have used these systems with great results.they work hand in hand by not only cooler air but increased volume on the intake,and improved discharge of engine exhaust.the engine efficiency improves,and that is manifested in h.p. and fuel economy.these improvement are not drastic,but very noticeable and rewarding.and if your looking for a mellow sound Magna will give you that.4. Says: This is the idea behind "Cold Air Intakes", however some work better than others. To answer your question, yes. The cooler the intake temperature, the more efficient an engine will run. This is because cold air is more dense than warm air, the denser the air, the more oxygen. Which results in faster, more efficient combustion.5. Says: To some extent, I think it would. But too cold would also cause the gas to not ignite as it should, such as starting a car on cold days...that is why it runs rich, because it needs more gas to enable the cold gas to ignite...some of it won't.
But to cool it down, does help increase the density of the air/fuel mixture, that is why they duct it outside the engine...the hot engine temps cause the gas to become almost vapor, and this is not dense...and the mixture is then leaner.
Computerized cars, most of which are today... will adjust the mixture to keep it at 15 to 1 ratio, so if the air is hot and thin, the gas added would not be as much..and...loss of power.
Colder, denser air results in a heavier air fuel mixture and thus more power...but ...perhaps at the cost of more gas....I don't know for sure...I just think it would.
It is a balancing game, really. More power, more gas.... especially at higher speeds.
But I could be wrong, I am just ..a back yard mechanic...not a professional one.6. Says: No just warp the intake valves,been there done that be safe my friend Tag: Cooling the air-fuel mixture?