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Andrew280SEL 16th January 2015 09:54 PM

Re: Ineffective Air Cleaners
Interesting about the K&N filters vs stock. Probably not a bad thing, as an aftermarket unit might look a bit odd on a Benz :cool:

Oversize 17th January 2015 11:08 PM

Re: Ineffective Air Cleaners
I think you guys have missed the point! My observation was that the hump in the middle of the housing to clear the divider is effectively blocking 1/3 of the element surface area!!

The design does not draw air from the top of the engine but along side it, above the exhaust manifold (which is probably worse)! Cold air is definitely worth the effort and on a 6.9 there are several options. Something interesting which I forgot about (until I saw one today) is the RH guard intake duct on a W124 diesel....

I've heard the same about K&N filters and the quality isn't as good as a MB or OEM one.

Oversize 17th January 2015 11:13 PM

Re: Ineffective Air Cleaners
1 Attachment(s)
Here's a pic:

CraigS 18th January 2015 06:14 AM

Re: Ineffective Air Cleaners
The best conversion I have seen was to go the other way and draw the air from the ducting/grill below the windshield. The air cleaner was ducted into the firewall, allowing it to draw down cold air from the grill.

Oversize 19th January 2015 09:24 PM

Re: Ineffective Air Cleaners
Ahhh yes but that involves a structural mod which would require approval from an Engineer

Oversize 7th August 2019 04:12 PM

Re: Ineffective Air Cleaners
4 years 7 months since I felt this was an issue and it's finally be proven true on the dyno by Carobu!!! And rather than make a lot of changes to the standard assemblies, I intend to use one from a W140. But even that may need some (more minor) custom mods....

Oh and apparently the air valve baffle (stopper bridge) also restricts air flow.

Oversize 7th August 2019 04:16 PM

Re: Ineffective Air Cleaners

sean sherry 9th August 2019 06:43 PM

Re: Ineffective Air Cleaners
Been chasing knowledge about Mercedes C Class W204 Air Filters which are as good as they come. No advantage fitting K & N washable Filter
Biggest improvement has been resetting The ECU and the TCU back to how they left the Factory. I now have a part throttle downshift, crisper upshifts and responsive Throttle. I guess Mercedes know that they :Dare doing !!!!

Oversize 10th August 2019 09:22 AM

Re: Ineffective Air Cleaners
They do NOW, but premerger with AMG I think they were somewhat confused. Seems like divisions of marketing, bean counters & engineering weren’t getting along.

I think in some ways they down-specced the 6.9 so it wouldn’t take sales from the 600 which was already selling at a loss apparently.

How else can you explain the std airfilter without cold air, a tiny throttle, tiny exhaust outlets, manual seats & vinyl without timber on the door cards??

Oh and the title of this thread could be better... The airfilter was great; what it was mounted in was not.

Oversize 13th November 2019 10:46 AM

Re: Ineffective Air Cleaners
I just bought 2 so letís see how they go on a 560 & 6.9!

sean sherry 14th November 2019 06:50 AM

Re: Ineffective Air Cleaners
Interesting comment Mark about what Air Filters are mounted too Reminds me of the Mercedes Add that said Air Bags are great but it depends what they are mounted on..... a picture of a shopping trolly.:eek:

sean sherry 14th November 2019 06:01 PM

Re: Ineffective Air Cleaners
The factory knows best....advertised aftermarket Air Filters in Turbo charged Cars may pass more Air... but is it clean ?... such Filters cause premature wear on the tips of the Turbo Blades... very common.. ask the repairers. The factory Filters in both our C Class W204 Turbos give maximum protection coupled with efficiency.
I don't profess:) know more than forty thousand Mercedes Engineers !!!

Patrick_R 16th November 2019 11:41 AM

Re: Ineffective Air Cleaners
Our Australian spec trucks run dual elements in a single housing like this.

Sometimes in remote areas where it is extremely dusty, (especially our super fine red bull dust) they will run 2 of these in series.
Modern truck turbos are under so much pressure the slightest trace of dust can be catastrophic.

The below story does not fully relate to the topic, but it sort of does :eek:
If a turbo fails, and starts passing oil, a large Diesel engine can “run away” being fuelled by the engine oil, now passing into the combustion chamber, even if someone turns the ignition off.

I’ve only ever seen it once on a 17.2L IVECO V8, with a massive central single turbo in the valley.
It was brought in for engine oil consumption issues. Right at the moment the mechanic was checking it, the turbo bushes failed.

It started to run away, and the smart leading hand stripped off his overalls, and threw them into the open air cleaner inlet.

This was a big man, and his overalls were huge, but they disappeared in a blink of an eye!

Luckily, it starved the big V8 of air, and she shut down.

Could have been very horrible, as the max engine speed of the V8 was 2200RPM.
The truck telemetry told us the engine achieved a max rev of 3200RPM.

Oversize 13th December 2019 12:08 PM

Re: Ineffective Air Cleaners
The W129 airfilters wonít fit a M117 or M100 without substantial mods which defeats the purpose. Back to the drawing board...

Oversize 14th April 2020 04:01 PM

Re: Ineffective Air Cleaners
Hereís some ideas tried by some...

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