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Originally Posted by Mean Green

Here is some knowledge to settle the hot air intake discussion.

The main disadvantage to all of these is the fact that they are drawing in hot air from inside the engine compartment. Intake air temperature is very important whenever performance is a concern. It is a general rule of thumb that a engine will loose one horsepower for every additional ten degrees that the intake air temperature is increased.

Here's the whole article

ISUPAGE; Performance Intake System Basics

I rest my case.

And I thank you for proving my point. I completely agree, and could have TOLD YOU that for every 10* there is a 1horse drop. The discussion wasn't about power, but in fact economy. Which this article backed.

Originally Posted by quicksilverdon

The argument was not over horsepower, but over gas mileage.
I'm not trying to re-institute the debate, just sayin'....

Yep, thats correct.

Originally Posted by ChefTank

Your right! All the big turbo guys run a closed system... *stirs coals to stoke the fire*

Not true at all. I mean, maybe in PT-Land.. but I've had several turbo cars.. one of them ran 12's/hi 11's depending on the day/tune. The turbo produces so much underhood heat that putting in a cold air intake is worthless since the second the air touches the hot side of the compressor it's instantly like 500*. Plus, an open filter sounds way better.

Originally Posted by edsidders

When my old company skunkworks modified cars for the Mobilgas Economy Run We found out that higher engine temperatures slightly increased the MPG but that was from lower friction/viscosity from the lubricants and a slightly warmer combustion chamber. The air was brought in from a outside pick up located in the grill area as to get the coolest,most dense air charge,,a rainy day helped even more..This was in the days before fuel injection and electronic ignition..There were no computer systems to adjust the timing and fuel mixture.The same principles still work today and even better results are expected..The higher engine temperatures also help with the emissions... No I don't want to work anymore,,I'm RETIRED

I think somebody got engine temp and intake temp confused in the earlier thread....

Good post.

Originally Posted by Mean Green

Actually, if you lose hp because of intake temps you also lose torque which means your car has to work a little harder and therefore use more gas. On a dyno I saw a PT GT lose 19 lbs/ft of torque with an open heat sucking intake.

Sorry CREWZIN, but that tips for better mpg just lost all credibility with me when they said a cold air intake will give you an easy 5-10 more mpg. If that was really the case then all manufacturers would be using them to dramtically raise mpg on their whole fleet. Funny though, how they all use a closed system to keep hot engine air out of the intake.

Well I mean.. I dont know how much more to put it other than I personally gained 4mpg city driving putting an open filter on.. and when I drove it hard and had fun with it (always gotta break in that new toy/part!), it got the same gas mileage as before I put the intake on. Facts are facts buddy. And manufacturers develop cars to be quiet and practical.. most people dont want noisy intakes or noisy turbos etc like we do.