Cold air vs warm air
07-27-2005, 05:39 PM
#12
EXTREME Moderation
Join Date: Apr 2005
Location: BLAM-O
Posts: 7,895
RE: Cold air vs warm air
ORIGINAL: _Shifty_
I still don't get how an engine is getting less air in summer, and more in winter. How is that?
The heater thing is irrelevant, as stated above, alt runs all the time.
The hotter combustion chamber seems feasible, can anyone confirm that? Don't all engines get up to a hot temperature eventually, though, regardless of outside temp?
I still don't get how an engine is getting less air in summer, and more in winter. How is that?
The heater thing is irrelevant, as stated above, alt runs all the time.
The hotter combustion chamber seems feasible, can anyone confirm that? Don't all engines get up to a hot temperature eventually, though, regardless of outside temp?
2. when the air is denser, there are more molecules of oxygen per 4.6 liters of air, assuming you have a 4.6L engine. When your engine takes in air, it will take in 4.6 liters of air per cycle. During winter, there are more molecules of oxygen in the 4.6 liters, because it's colder and denser. During summer, it is hotter, molecules are spread out more. During summer, when your engine takes 4.6 liters of air, there is less oxygen in those 4.6L of air, and you will burn less fuel. the air/fuel ratio should be the same, so more air requires more fuel. It's the same reason your tires will have a higher pressure when hot vs. when cold. Got it?
-Professor thermodynamics
07-27-2005, 06:03 PM
#16
1st Gear Member
Thread Starter
Join Date: Jul 2005
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Posts: 68
RE: Cold air vs warm air
Thanks. So the exceptions to that rule, then, would be mods that improve efficiency, I guess. Like a better flowing exhaust, that would improve both mileage and performance, right?
07-27-2005, 06:50 PM
#17
Gentleman's Relish
Join Date: Feb 2005
Location: AZ
Posts: 13,090
RE: Cold air vs warm air
ORIGINAL: redass02gt
1. The difference in engine temp should be zero degrees if your **** is running well. Your engine warms up and stays at a stable temp. when warm, so winter and summer engine temp should be the same.
2. when the air is denser, there are more molecules of oxygen per 4.6 liters of air, assuming you have a 4.6L engine. When your engine takes in air, it will take in 4.6 liters of air per cycle. During winter, there are more molecules of oxygen in the 4.6 liters, because it's colder and denser. During summer, it is hotter, molecules are spread out more. During summer, when your engine takes 4.6 liters of air, there is less oxygen in those 4.6L of air, and you will burn less fuel. the air/fuel ratio should be the same, so more air requires more fuel. It's the same reason your tires will have a higher pressure when hot vs. when cold. Got it?
-Professor thermodynamics
ORIGINAL: _Shifty_
I still don't get how an engine is getting less air in summer, and more in winter. How is that?
The heater thing is irrelevant, as stated above, alt runs all the time.
The hotter combustion chamber seems feasible, can anyone confirm that? Don't all engines get up to a hot temperature eventually, though, regardless of outside temp?
I still don't get how an engine is getting less air in summer, and more in winter. How is that?
The heater thing is irrelevant, as stated above, alt runs all the time.
The hotter combustion chamber seems feasible, can anyone confirm that? Don't all engines get up to a hot temperature eventually, though, regardless of outside temp?
2. when the air is denser, there are more molecules of oxygen per 4.6 liters of air, assuming you have a 4.6L engine. When your engine takes in air, it will take in 4.6 liters of air per cycle. During winter, there are more molecules of oxygen in the 4.6 liters, because it's colder and denser. During summer, it is hotter, molecules are spread out more. During summer, when your engine takes 4.6 liters of air, there is less oxygen in those 4.6L of air, and you will burn less fuel. the air/fuel ratio should be the same, so more air requires more fuel. It's the same reason your tires will have a higher pressure when hot vs. when cold. Got it?
-Professor thermodynamics
j/k. Yep that's the answer!
07-27-2005, 08:09 PM
#19
Gentleman's Relish
Join Date: Feb 2005
Location: AZ
Posts: 13,090
RE: Cold air vs warm air
ORIGINAL: redass02gt
shifty was having issues with the science, so I had to take him to school! mwaaahahahaha. there, happy now?
shifty was having issues with the science, so I had to take him to school! mwaaahahahaha. there, happy now?
<Smacks Mr. Wizard Cap off Redass's head> There we go! Much better