Restrictive Air Filter Assemblies

More threads by Oversize

OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
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.
 
Last edited:
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
1-ACE74-C3-5-CF2-49-AB-A7-EA-EF3-F2-DB4-C9-AC.jpg

C58-BF956-DB1-E-4938-9998-4-FAE0-F19-F442.jpg

FEC51-C31-B21-F-4345-9-D82-1-E5-A3-E144-E1-E.jpg
 

sean sherry

Master
Messages
2,050
Points
189
Location
sydney
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 !!!!
 
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
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.
 
Last edited:
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
I just bought 2 so let’s see how they go on a 560 & 6.9!
 

sean sherry

Master
Messages
2,050
Points
189
Location
sydney
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

Master
Messages
2,050
Points
189
Location
sydney
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

Grand Master
Messages
2,791
Points
445
Location
Claremont Meadows
Our Australian spec trucks run dual elements in a single housing like this.

8-B3-CB593-2-F56-44-FE-9-AC2-6734-F5877-D29.jpg

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.
 
Last edited:
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
The W129 airfilters won’t fit a M117 or M100 without substantial mods which defeats the purpose. Back to the drawing board...
 
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
Here’s some ideas tried by some...
509-BA269-3-F37-4-DEB-ACDD-B6-D90498054-D.jpg

DCDEE937-E5-A4-474-E-9623-BBA9-F7-DD35-E0.jpg
 

sean sherry

Master
Messages
2,050
Points
189
Location
sydney
I could never understand why all the American V8s draw very hot air from the top of their Engines with the Filter in a hot Metal Box As the ambulant Temperature Rises ... H.P. goes down. 2% to1 HP
Then mated with heavy inefficient Cast Iron Exhaust Manifolds.
Their philosophy holds true ..... more H.P. ? build a bigger Engine !
$$$$ I suppose ? Charge more for more metal !!
 
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
Honestly I think on the performance models, Benz would’ve been better to raise the whole air filter assembly above the divider & eliminate the restriction at the centre of the assembly. That could also allow more headroom into the air flap. Obviously a bonnet bulge would be required which would distinguish it as a premium model while allowing easy access to cold air via one or two tasteful scoops
 

Pete49

Aficionado
Messages
66
Points
39
Location
Pt Augusta
Ahhh yes but that involves a structural mod which would require approval from an Engineer
I would think that an Air Cleaner plonked on top of an engine and drawing hot Air from high up in the Engine compartment can't be very efficient irrespective of the type of filter element.
On the 107 SLs fitted with a 110 DOHC Six Mercedes located the Air Cleaner low down to the side of the Radiator to avoid this issue.
My understanding is that for every 2% rise in ambient Temperature , an Engine losses 1 H.P.
Jaguar did the same thing with their E Types with the Air cleaner on the side of the Engine drawing cool Air.
Both our modern cars a C Class and a Mk V11 Golf have cold air intakes , std.
on my Jaguar 420G the air filter is down on the right hand side mudguard in its own little area like the E type. simp[e and effective.
 
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
BTW the title of this thread should be changed to ‘Restrictive Air Filter Assemblies’, since there’s nothing wrong with the actual filtering function
 

Michel

The Prince of Arabia
Moderator
Messages
10,074
Points
775
Location
Sydney, Australia
on my Jaguar 420G the air filter is down on the right hand side mudguard in its own little area like the E type. simp[e and effective.
However, on the W126 560 SEL, the air filter had two conduits that drew cool air from the from top the car, past the radiator and gave a very well deserved breath of fresh air to the engine!
 
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
However, on the W126 560 SEL, the air filter had two conduits that drew cool air from the from top the car, past the radiator and gave a very well deserved breath of fresh air to the engine!
Yes however it’s still internally restrictive
 
OP
Oversize

Oversize

Grand Master
Messages
5,856
Points
596
Location
Melbourne
If K & N Filters are so great how come high end manufacturers don't fit them ?? Is it because that Paper Elements do what they are supposed to do .. Filter efficiently to protect the Engine.
I think it’s all about good marketing without independent testing or real data to support their claims. Similar to Moreys oil additive and pretty much all fuel system ‘cleaners’
 
Similar threads
Thread starter Title Forum Replies Date
Michel Medium size air compressor for sale. Gumtree/eBay/Facebook Listings 1
S Air Bags Articles 5
S Air Con mystery Articles 24
Oversize Cold air intakes & intercoolers Technical Information 0
S Air Bag Replacement Mechanicals 9
A Air conditioning parts Mechanicals 6
S Seat Air Bladders Websites and Links 4
c107 electric air con Interiors 3
A Air con drain Mechanicals 3
S Air Bags work ! Exteriors and Body Repairs 11
S Air compressor Gumtree/eBay/Facebook Listings 0
260ebenz Air con re-gas Talking Torque 34
motec 6.9 Red Dot Lemforder air cells Gumtree/eBay/Facebook Listings 2
motec 6.9 wanted 560 twin air cleaner Mechanicals 23
S fresh air out let Mercedes R/C107 3
S aux air valve Mercedes R/C107 3
S Aux air valve Mercedes R/C107 3
S Air con. problem 280SL 107 '81 Mercedes R/C107 5
A air flow meter Mechanicals 2
S air con pressure switch Mercedes R/C107 0
S air con pressure switch Mercedes R/C107 7
S aux air valve Mercedes R/C107 6
Tony66_au Aux Air Valve refurb ( AAV ) Technical Information 12
T W107 Heater/Air conditioning Mercedes R/C107 19
Oversize 6.9 throttle & air filter conversion Mercedes W116 4
260ebenz Cleaning air vents Interiors 4
M 116 Genuine AMG front air dam questions Exteriors and Body Repairs 3
Styria Replacement of Air Con hose Mercedes W116 0
J 6.9 Air cells check & replacement Mechanicals 8
A 450SEL Air cond Mercedes W116 10
Styria Removal of 6.9 Master Air Cell Mechanicals 1
A 450SEL Air cond Mercedes W116 7
B Air Conditioner Puzzle Mercedes W116 5
Michel Air Bags for 300SEL -Starting @ $50 Gumtree/eBay/Facebook Listings 0
J 6.3 Front Air-Bags Gumtree/eBay/Facebook Listings 3
WGB Cold air intake(s) Mechanicals 25
6.9forever Air conditioning that works too well! Interiors 11
OzBenzHead WTB (or otherwise legally obtain): W112 / W109 air suspension valves Gumtree/eBay/Facebook Listings 3
Styria Air Pressure Cells Mechanicals 35
Des Air cleaners Exteriors and Body Repairs 14
J Aux Air Valve Mechanicals 2
hoddo how colds your air? Mercedes R/C107 4
Oversize New filter won’t fit?? Mechanicals 2
WGB Pictorial - Rear end rebuild Part 9 - Fuel filter and hoses. Interiors 0
Oversize Suspension filter Mechanicals 14
Styria Changing Fuel Filter on 116/107 Mechanicals 15

Similar threads

Top