Airfilters mpg

To get power at the flywheel you put in fuel, and add air to burn it. The engine say an engine that puts out 500 hp well it actually makes about 700 it takes 200 to turn over the motor, that is the friction HP. adding extra air above what you need increases the friction HP it does not add anything to the output. The air comes out of the turbo into the CAC, to cool it. A c16 is 964 cu inches at 1500 rpm it uses 10041 cu ft of air every minute, and that is without figuring the increase there would be from the turbo boost. Just a thought!

 

yep now when that air is cooler you pack in more thats why racers put hood scoops on the hoods to ram in moore air but this is getting away from the subject. air filters wont make hp sole reason to clean the air going to engine.

 

JohnP3-Air cleaners do not force air into the engine. The engine sucks air through the air cleaner. You could put a 50 gallon air cleaner on it and it still would not force air into the engine. When one cylinder is on it's intake stroke, another cylinder is on it's power stroke, which pushes the crankshaft, which pulls down the piston that's on it's intake stroke. The less resistance the intake-stroke piston has to pull against from the air cleaner setup, the more usable power goes to the flywheel.

Two hundred horsepower of internal friction? Do you know what a 200hp starter would look like?

 

Josh,c you do not start an engine at 1500 RPM., they turn it at about 220RPM. I have been in the business of fixing engines for the better part of 42 years. What I said was the Air cleaner on a FLD120 Freightliner uses the same cold box technology as Nascar does, there is a preasure built up in front of the windshield, and it does give a boost to the air going into the filter, I have ran trucks on the dyno with and without the air intake on the turbo the difference is minuscule. Saying you get anything from a washable air filter, when there are test results, that prove they allow dirt threw. And talk about better mileage and response, well you would think that without the intake there should be a big difference. What happened was a slight loss. The whole thing about an air filter is to clean the air. If you want the filter housings, hanging off the hood and mufflers by your ears it is for looks not efficient. If you ask at any dealer for the print out of aerodynamics for every option there is a value, % up and down depending on air flow.

 

i agree 100% air filters dont force air into the engine that isnt what i said at all dynoing you will have minuscule effect THE TRUCK ISNT MOVING i have been driving for 40 yrs as a o/o done 99.9% my own mech work. washable air filter i also agree its not worth buying. im saying from having both under hood or outside of hood on many trucks i have owned outside is a lot better. im just saying from experience. thats all i am going to say on the subject.

 

You said it right there.

If you got more power out of an engine with the air cleaner on than off, there is another variable at work. On a dyno, I would believe that the difference is small. Both types of air cleaners would benefit from the moving air at road speed. I don't think anyone would argue that the external air cleaners are less aerodynamic.

If there was 200hp worth of friction at 1500rpm, we would have to take the transmission out of gear to coast.

 

i'm totally with you on this alll my trucks have exposed air cleaners
its this simple cooler air=better performance

 

Not to be a jerk or anything... an air cleaner that doesn't get dirty isn't doing its job.

Everything your old filter caught is going right into your engine.

 

I've never heard of a diesel requiring backpressure. Every time I ever opened one up with cooler free-er flowing air on the intake and free-er flowing exhaust through straight pipes always had better throttle response, more power, and got better fuel mileage. Diesels do not need backpressure.

 

since no one wlsw asked , I will .... what is the cost of the fleet air?