invest in a K&N air filter

[RedDevil]

If you mount a K&N filter in such a way that it draws warm air from the engine bay while the original filter draws cold air, then the K&N filter works as a proper WAI.

The way K&N filters are constructed makes it higly likely that this happens.
We know the positive effect a WAI can have, especially in winter.
8% mpg gain does not sound unreasonable.
This is no miracle feat of K&N, just the effect of a WAI.

(wish this had jumped to mind earlier, things might have turned out differently.)

EDIT What the... I thought this was another thread! Sorry for breaking word. I'll dive under again.
The post fits the topic, I'll leave it as is.

[Cobb]

Tee Hee, no mwebb I read your graphs from the geo forum and I did read the report. I was waiting for a few trolls to post before I came clean.

Notice in some cases there was actually a slight improvement in fuel economy from the dirty vs the clean air filter? I know my insight was plugged up and attempts to free it resulted in less mpg, but more umph from the butt dyno and less mpg.

Red, right. Many cars have a cai built into the air intake system, then the so called CAI kits just have an elbow that plugs into the throttle body and a large cone shape filter that sits right in the engine bay and in many cases in the radiator exhaust stream sucking in HOT HOT HOT air.

Of course many of us who undo some of the plumbing so the engine sucks in warm air from under the hood have seen some gains on short trips under 10 miles, while longer trips you see a drop depending on the engine.

I know my geo didnt mine under hood heat and removal of all the plumbing. Ive seen quite a few sidekick/samurai that have the intake plumbing cut short and a cone shape filter attached to the end undoing the plumbing from sucking cool air from the drivers wheel well.

[mcrews]

Originally Posted by RedDevil

If you mount a K&N filter in such a way that it draws warm air from the engine bay while the original filter draws cold air, then the K&N filter works as a proper WAI.

The way K&N filters are constructed WHAT?????? makes it higly likely that this happens.
We know the positive effect a WAI can have, especially in winter.
8% mpg gain does not sound unreasonable.
This is no miracle feat of K&N, just the effect of a WAI.

(wish this had jumped to mind earlier, things might have turned out differently.)

EDIT What the... I thought this was another thread! Sorry for breaking word. I'll dive under again.
The post fits the topic, I'll leave it as is.

"The way K&N filters are constructed....."
really......?????
the K&N filters mimic the stock design of the original filter, it's a drop in substitution.

maybe......what you are talking about is something different, like a CAI/WAI bolt-on product with a cone designed filter?


so yeah....off topic again.

[Cobb]

You mean like testing mpg from a dirty filter, no and a KN?

Originally Posted by mcrews

so yeah....off topic again.

[maxc]

I put K&N air filter on 1997 f150 back in 2001. Every 3 months or so when the engine starts to stumble clean MAF sensor. Took K&N air filter off. nuff said!

[mcrews]

Words have meaning.......
when you say "K&N FILTER" it means a factory compatible drop in oiled filter.
It DOES NOT mean a CAI/WAI bolt-on w a cone K&N filter on the end.

so yes, testing a "K&N filter" is on topic

why is this so hard to understand??????

[Cobb]

Easy, cause on the end of the pipe is a kn filter element. Arent all filter elements from kn the same? Same oil? Same warranty? Ive purchased both drop ins and cai kits and both I notice an improvement in drivability from the butt dyno.I never noticed any increase in mpg. Thats ok, Ill take that. If I see nothing Ill be the first one to return it.

I return several items a month I purchase because it didnt perform as expected, failed or I didnt like it.

Originally Posted by mcrews

why is this so hard to understand??????

What we really need is a prius or some car that has independent control of the engine, a set route about 20 miles to set cruse control and just steer the car on to really give an updated test. Then test a stock, drop in, dirty and a cai. Interesting the "performance" filter caused a drop in mercury and most hybrids have a delayed closing of the intake valve to lessen pumping losses to increase efficiency, ie lower vacuum psi.

[MetroMPG]

Originally Posted by Frank Lee

Should be "fullofsheet".

Originally Posted by mcrews

the-bull-sheet

These replies were uncalled for.

Yes, the first post raised all kinds of big red flags. And it's easier to throw out insulting one-liners than to try to gauge what's actually going on and try to steer the conversation somewhere constructive. I get that. (Especially if you've been here forever and heard it all before.)

But I'm sorry I missed this thread until now, because I think RedDevil's right:

Originally Posted by RedDevil

If (s?)he is an aspiring ecomodder we put her off big time. ... I don't like the idea of scaring away new members just because they make some incrediulous claim in their first post.

The pile-on from a few members makes this forum look really bad.

[Insight for life]

Thank you Darin for chiming in.

[Honda]

Originally Posted by ChazInMT

Lets look at the 2 extremes for an air filter. If a filter is highly restrictive, then the throttle will open more for a given power setting than it normally would to draw more air through the filter, same amount of air enters the engine, same amount of fuel since the fuel injection operates somewhat independently of the throttle position. Thus fuel economy is the same.

What is the purpose of TP sensor on manual transmission vehicle? I thought the wider the plate opens the wider the pulse width of the injectors based on the voltage received from the TP sensor.