Cold air, hot air.....

[mrvette]

http://speedtalk.com/forum/viewtopic.php?t=2178

INteresting discussion there, and curious about one thing in particular...that is...

Most of us want cold air induction, fine for power, but the comment above was that hot air is better for MPG.....ok....

how hot?? and what can be expected on the temp gradient??

putting the induction behind the radiator any help??

for instance, on my FI, I have a dual snorkel air induction, IF I took that and placed it in the back of the rad, one air cleaner there behind the rad, and a flapper in the Y pipe, with the other air cleaner up front....

what if anything would be the expected results on fuel economy??

:crutches:

 

[bobs77vet]

i dont know about all of that......seems to me FI already has the advantage with metering the fuel and it compensates for just about everything......the more stock engines may get better fuel econmy with warmed up air.....but my cammed engine is thirsty for cold air and runs best on those cool moist days.....so i just recently switched to the stock style dual snorkle set up and i have only one thing left to hook up and thats the flexible tubing.

 

[mrvette]

Strange thing is, even with FI from a '91 Firebird program...the '72 runs better/more powerful in winter than summer.....

not that I"m not long since ready for winter to END....

:smash:

 

[TimAT]

Warm air helps the fuel atomize better, but cold air has a higher density.

 

[69427]

Warm air helps the fuel atomize better, but cold air has a higher density.

Ding, ding, ding, ding! We have a winner! :thumbs:

 

[mrvette]

Warm air helps the fuel atomize better, but cold air has a higher density.

Ding, ding, ding, ding! We have a winner! :thumbs:

All well and good, I KNOW that....but with FI, WHY should it make any difference in just plain running feel??

:hissyfit::quote:

 

[TimAT]

Cold air "usually" has a higher moisture content too. Pack more air in with a little fuel and you get a bigger bang. And the moisture cools the charge even more. End result is same fuel, better efficiency.

 

[mrvette]

Cold air "usually" has a higher moisture content too. Pack more air in with a little fuel and you get a bigger bang. And the moisture cools the charge even more. End result is same fuel, better efficiency.

Which gets down to the old trick of water injection....but I have never played with it....

:shocking::amused:

 

[TimAT]

there were a few of those WW II fighters that had water/methanol injection to get a little more at high power settings. Even the early 747's had water injection. Didn't take too long for everyone to toss it- the added weight of the water took too much of the payload and that means less $$.
Remember the old movies with the jets leaving a heavy trail of black smoke? Combination of poor combustion and water.