Cold air intake? - Page 3 - PeachParts Mercedes-Benz Forum

Old300D · #31 10-18-2007, 01:59 AM

Quote:

Originally Posted by Mister Byrnzoil

Ignorance truely is bliss.

I don't know where to begin to deal w/ that mess I just had the displeasure of reading, but perhaps you'd like to take a lesson from the silver portion of my stock hood pad??

Congrats... you just made the ignore list, along w/ ineon and that guy who never changed his oil... you're in good company.

Wow. Hard to face the possibility your "cold air" intake may not be delivering what you'd hoped...

#32 10-18-2007, 05:42 AM

Don't forget that most of the energy consumed during compression stroke is released on the rebound stroke.

That's pretty sad if you add somebody to the ignore list simply because they pointed out a flaw in your logic.

rwthomas1 · #33 10-18-2007, 06:54 PM

The interesting thing about these little discourses is that some posts walk right up to the line of calling someones car or opinion crap, just shy of the moderators rules. The result is someone getting offended and the ignore list is the only recourse available. Unfortunately, this doesn't really add to the discussion either. I submit that before posting something you consider the appropriateness of the statement if it was given face-to-face. Things said in text often lack the nuance of the same phrase given with a smile. I have had several postings directed at me that would have resulted in new and interesting bruises for the author were they in range. Unfortunately the ignore list works, but again, doesn't fix the issue or add to the discussion.

I own an intake like this that was homebrewed. The K&N I used is much larger. The oil separator is much larger and better designed. The reason for doing this? I couldn't stand replacing another set of rubber air filter mounts and the racket that big filter makes when they are shot. I think I have 30K on the homemade intake and I am very happy with it. I don't give a damn if it adds or detracts from performance. The difference will be negligible either way. I wouldn't call it "rice" as it isn't on an Asian vehicle, it has a purpose other than looks, and its not claimed to increase performance.

RT

ConnClark · #34 10-18-2007, 07:40 PM

There are a few cases where heating the air actually helps after you compress it, such as a Brayton cycle with thermal regeneration .

A diesel is different however cycle however. Diesels get more efficient with the more excess air they have inducted into the cylinder as more energy goes into heating the working fluid instead of the cooling system. This results in a higher BMEP or in other words more power to the wheels.

For the same reason, a cooler intake charge of the same mass will also result less loss of energy to the cooling system and result in a higher power output.

#35 10-18-2007, 07:54 PM

Quote:

Originally Posted by ConnClark

There are a few cases where heating the air actually helps after you compress it, such as a Brayton cycle with thermal regeneration.

Agreed, but the key is that all the energy addition happens after compression (at the "top" of the cycle). I can't think of any case (in a cycle using compressible fluid) where heating the low pressure process fluid would be an advantage.

babymog · #36 10-18-2007, 09:47 PM

Quote:

Originally Posted by Mister Byrnzoil

Ignorance truely is bliss.

I didnt nead tu reed frthr then thss.

Cervan · #37 10-19-2007, 02:24 AM

doesnt something cold heat faster than something hot too?

heelerguy · #38 10-19-2007, 07:23 AM

Maybe I'm smoking dope but cooler denser air is denser because it has a higher concentration of oxygen....and oxygen is an oxidizer. To me it stands to reason that just like oxygen invigorates combustion in an oxy-acetylene torch and when mixed appropriately produces and very effecient flame it would do the same in an internal combustion engine. Just a thought but this is what makes sense to me....having said that the tractors on the ranch pulled quite a bit better and used less fuel per hour in the dead of winter feeding cattle than in the middle of summer haying.

Jim

Just an afterhought but isn't denser more oxygenated air the premise behind water injection?

superbeast1098 · #39 10-19-2007, 11:02 AM

If you put the "cold" and "hot" aspects of the situation aside for a moment, here is my opinion....

Most factory airboxes are designed to slow down the aitflow to help make the rather quiet. a Cold Air Intake is supposed to hels improve airflow into the engine. Meaning the engine doesnt have to work as hard to draw in the air needed for combustion.

I will agree that Mercedes diesels have an excellent air intake system whick doesnt need anything other than fresh filters...... As long as you change your filters on a regular basis, you are good to go..... There isnt enough of a performance increase to warrant the purchase of a CAI...

ConnClark · #40 10-19-2007, 12:39 PM

I personally would like to place another paper filter element in parallel to my stock one to reduce pressure drop across the filter. But my main motivation is the fact I have an 85 Cali car and the filters for that cost $$$ . Another filter in parallel would extend the life of the stock one and reduce over all operating costs for me.

As for power gains produced by using a K&N filter I'm not very optimistic.

A simple test to see what the maximum possible difference would be for people is to time a few 0 to 60 runs with a clean stock filter and then remove the filter and do some more timing runs.

#41 10-19-2007, 01:13 PM

Quote:

Originally Posted by ConnClark

A simple test to see what the maximum possible difference would be for people is to time a few 0 to 60 runs with a clean stock filter and then remove the filter and do some more timing runs.

I'll pass.

Hatterasguy · #42 10-19-2007, 01:58 PM

Quote:

Originally Posted by superbeast1098

If you put the "cold" and "hot" aspects of the situation aside for a moment, here is my opinion....

Most factory airboxes are designed to slow down the aitflow to help make the rather quiet. a Cold Air Intake is supposed to hels improve airflow into the engine. Meaning the engine doesnt have to work as hard to draw in the air needed for combustion.

I will agree that Mercedes diesels have an excellent air intake system whick doesnt need anything other than fresh filters...... As long as you change your filters on a regular basis, you are good to go..... There isnt enough of a performance increase to warrant the purchase of a CAI...

Thats where Mercedes differ from other cars, well like GM's and Fords. The factory stuff on MB's is so good that you will not gain much if any power by changing say the air box's and exhuast like you will on a Chevy.

This is a different ball game, the same rules that you would use to tune a Mustang do not apply.

patbob · #43 10-19-2007, 07:08 PM

Quote:

Originally Posted by sccasper

These look cool, but are they not advised. Has anybody seen or used anything like these on their diesel mercedes? Not refering to the propane injection just the airintakes with oil separator...

http://www.wade************************/diesel.html

Had one. Replaced with stock setup. Couldn't tell the difference.. except no more clouds of oil mist from under the hood and no more oil-soaking of the rubber suspension parts under the car. Suggest you put the money toward beverage of your choice.

Cervan · #44 10-19-2007, 10:43 PM

Quote:

Originally Posted by patbob

Had one. Replaced with stock setup. Couldn't tell the difference.. except no more clouds of oil mist from under the hood and no more oil-soaking of the rubber suspension parts under the car. Suggest you put the money toward beverage of your choice.

yeah, then you can show off your beer gut to your friends, instead of the same horsepower on your mercedes.

deerefanatic · #45 10-20-2007, 09:39 PM

Come-on people!! If you want higher flow than a paper filter provides, why don't you all just pony up and get the K&N element for the stock airbox? It's like $60 last time I checked, and you STILL have the TRUE factory cold intake... And NO, the box and plumbing isn't restrictive.... Someone here had one flow-benched and it was waaayyyy more than a 617 could suck down even at redline.......