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-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   My New Euro Lights Are Causing My 300SD To Be Slow (Time For a K&N Air Intake?) (http://www.peachparts.com/shopforum/diesel-discussion/253722-my-new-euro-lights-causing-my-300sd-slow-time-k-n-air-intake.html)

Hit Man X 06-02-2009 11:57 AM
Quote:
Originally Posted by compu_85 (Post 2213029)
No diesel S-Class in europe till the W140. 1995 I think. Hence why the euro lights don't clear the air flow meter on the diesel :(

-J


I have them on my SDL, have for years.

compu_85 06-02-2009 12:17 PM
I do too, and you have to remove the headlamp assembly to change a bulb :)

Squiggle Dog 06-02-2009 04:07 PM
Today the engine sucked the sock in and it was funny! Just kidding. Actually, it is still on there.

Even if the air filter was not in the air cleaner there is no way the sock could get sucked into the turbo or engine. There is a steel cage that goes all the way around the inside that keeps the air filter in place, so there is no way I can get screwed. :D The worst that could happen if it gets sucked in is clog the opening of the air cleaner. I have the sock on there to keep all the cotton and stuff that's in the air out of the air cleaner housing.

I don't see how any W116 300SD could POSSIBLY run well with Euro lights unless the intake pipe or possibly the headlight door is removed. It may be that some W116 300SDs have different intake setups than I do, but I doubt it. An engine just doesn't run well off of a pinhole for air.

My car is lethargic with the Euro lights and the intake pipe on at the same time. When I remove the intake pipe the car is suddenly fast again (no, the pipe is not clogged). I noticed the slowdown right after I installed the Euro lights.

I know I am right. I'd like it if someone who has a W116 300SD with Euro lights would look to see if their intake port is in the same location (behind the headlight) as mine. Make sure the intake hose is on. Then make sure the headlight door and plugs are in place. If all this checks out, then remove the intake pipe and test drive it. I bet you will find the car is MUCH faster.

pawoSD 06-02-2009 04:13 PM
Remove the sock and run it with the tube routed somewhere in the engine compartment, it will be fine that way. No need for the sock. As long as the filter is in place there is no need to worry about any debris getting in there.

mplafleur 06-02-2009 05:13 PM
You don't need a sock, that's what the air filter is for.

Yup, that light was restricting air flow. Something I was a little in doubt of until I saw the photos.

pawoSD 06-02-2009 06:40 PM
Quote:
Originally Posted by mplafleur (Post 2215125)
You don't need a sock, that's what the air filter is for.

Yup, that light was restricting air flow. Something I was a little in doubt of until I saw the photos.
I liked the intense skepticism until pics were provided. :D Indeed the W116 does have an interesting (and potentially restricted by euro lights) air intake.

brandlj 06-02-2009 07:28 PM
Years ago, the Mercedes Benz Club of America had this issue come up on a W116. In the Bentley book that was published with all of the hints and technical articles from the Star Magazine there was indeed an article about Euro lights on a W116 and how you had to find a way for air to get into the air cleaner. It showed a method for doing this using sheet metal parts and actually had the diagrams and measurements there.

I wish I could remember the specifics.

Hit Man X 06-02-2009 08:02 PM
Quote:
Originally Posted by compu_85 (Post 2214913)
I do too, and you have to remove the headlamp assembly to change a bulb :)


Just loosen the AFM bracket some.

Bio300TDTdriver 06-02-2009 11:10 PM
Quote:
Originally Posted by Squiggle Dog (Post 2215084)
Today the engine sucked the sock in and it was funny! Just kidding. Actually, it is still on there.

Even if the air filter was not in the air cleaner there is no way the sock could get sucked into the turbo or engine. There is a steel cage that goes all the way around the inside that keeps the air filter in place, so there is no way I can get screwed. :D The worst that could happen if it gets sucked in is clog the opening of the air cleaner. I have the sock on there to keep all the cotton and stuff that's in the air out of the air cleaner housing.

I don't see how any W116 300SD could POSSIBLY run well with Euro lights unless the intake pipe or possibly the headlight door is removed. It may be that some W116 300SDs have different intake setups than I do, but I doubt it. An engine just doesn't run well off of a pinhole for air.

My car is lethargic with the Euro lights and the intake pipe on at the same time. When I remove the intake pipe the car is suddenly fast again (no, the pipe is not clogged). I noticed the slowdown right after I installed the Euro lights.

I know I am right. I'd like it if someone who has a W116 300SD with Euro lights would look to see if their intake port is in the same location (behind the headlight) as mine. Make sure the intake hose is on. Then make sure the headlight door and plugs are in place. If all this checks out, then remove the intake pipe a

nd test drive it. I bet you will find the car is MUCH faster.
Leave the sock on! If you can get that many folks with their panties in a bunch over the sock, I'd leave it on, just on principle.

MBeige 06-02-2009 11:58 PM
Quote:
Originally Posted by brandlj (Post 2215204)
Years ago, the Mercedes Benz Club of America had this issue come up on a W116. In the Bentley book that was published with all of the hints and technical articles from the Star Magazine there was indeed an article about Euro lights on a W116 and how you had to find a way for air to get into the air cleaner. It showed a method for doing this using sheet metal parts and actually had the diagrams and measurements there.

I wish I could remember the specifics.
On the metal frame above the headlight, there seems to be a provision on each side for an air intake opening just as it is with the w123. I don't know if any w116's used these provisions but I'm sure it's there for a reason, unless it's not for induction but for something else.

Squiggle Dog 06-03-2009 12:56 AM
Yes, the sock thing is funny. I wanted to further test my theory by removing the intake tube. However, I was worried about all the cotton and other tree debris that is blowing all over getting sucked in to the air cleaner housing. The filter would keep it from entering the engine, but I wouldn't want the debris in there clogging it. The intake port is obscured enough that debris tends to not enter it. I thought of something I could use to keep the debris from entering and a sock seemed the most fitting as a temporary solution. Now, I have the toe end of the sock stretched tightly around them opening of the air cleaner and two clamps holding it in place. The majority of the sock is folded up on itself. I don't believe there is a high chance of it being sucked in because of the tight fit. If it does get sucked in, it cannot get past the filter, so at worst it might block the opening of the housing. I admit it's less than my standards but I am still figuring out exactly what resolution I will come to.

Scott

Squiggle Dog 06-03-2009 12:59 AM
Quote:
Originally Posted by MBeige (Post 2215379)
On the metal frame above the headlight, there seems to be a provision on each side for an air intake opening just as it is with the w123. I don't know if any w116's used these provisions but I'm sure it's there for a reason, unless it's not for induction but for something else.
My roommate thought of that and he picked up an intake tube assembly from a 300D W123 at Pull-A-Part. There is not enough room to mount it as the battery gets in the way as well as the hood latches. It was a good thought, though. Looking at the other W116s (all gasoline models) the air cleaner has a nozzle that goes to the front of the engine bay and seems to draw air from inside the engine compartment rather than using fresh, cold outside air.

MBeige 06-03-2009 01:11 AM
Quote:
Originally Posted by Squiggle Dog (Post 2215419)
My roommate thought of that and he picked up an intake tube assembly from a 300D W123 at Pull-A-Part. There is not enough room to mount it as the battery gets in the way as well as the hood latches. It was a good thought, though. Looking at the other W116s (all gasoline models) the air cleaner has a nozzle that goes to the front of the engine bay and seems to draw air from inside the engine compartment rather than using fresh, cold outside air.
Maybe that's perfectly fine after all...?

In the image I posted earlier, the intake hose was routed downwards. Is there any chance there'd be a hole there where the engine could breathe colder air?

Squiggle Dog 06-03-2009 02:30 AM
In that picture with the hose pointed downward maybe it is drawing in air that comes in from under the car, or maybe it is using the vent below the headlight that is supposed to be used for the battery cooling duct.

pawoSD 06-03-2009 10:35 AM
Quote:
Originally Posted by Squiggle Dog (Post 2215419)
My roommate thought of that and he picked up an intake tube assembly from a 300D W123 at Pull-A-Part. There is not enough room to mount it as the battery gets in the way as well as the hood latches. It was a good thought, though. Looking at the other W116s (all gasoline models) the air cleaner has a nozzle that goes to the front of the engine bay and seems to draw air from inside the engine compartment rather than using fresh, cold outside air.
Yes, many of the older gassers do not draw air with a snorkel and just take it from under the hood, they seem to do this with no issues. Gassers also suck in less air than diesels though. I know the 500/560 V8's do have a snorkel, and the 280s did.....and my 300E does.....MB does seem to prefer the cold air intake, it is ideal.


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