75 Benz 450 Exhaust manfold Air Pump Swap Out - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 09-29-2014, 11:04 PM Thread Starter
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75 Benz 450 Exhaust manfold Air Pump Swap Out

1975 Mercedes 450 SEL Sedan : Would like to remove the Air Pump I see it has a Pipe connecting to the Motor on the Passenger side . anybody know if you can remove them and block off the Inlet Pipe ? or is their some internal Passages that will cause problems , Just how does that system work exactly .
Can it be done without removing the Heads
***
The 1975 Yr Model 450 SEL has Catalytic Converter's under the manifolds. My Catalytic Converters where removed from that location and remounted under the floor it looks like about where your feet rest at the front seat area .
What Manifolds will bolt right on and work best without alterations , something less restrictive if anyone Knows ( Year make Model )
some Photos of the Car as it stands
I will remove the Cats unless That's a Bad Idea performance wise .
Any Input appreciated thanks in advance
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post #2 of 9 (permalink) Old 09-30-2014, 04:16 AM
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You might run afoul of your state air quality laws but everything I read about this same issue says the cats aren't necessary to proper running. I understand they throw off a ton of heat too?
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post #3 of 9 (permalink) Old 09-30-2014, 05:09 AM
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1975 Mercedes 450 SEL Sedan : Would like to remove the Air Pump I see it has a Pipe connecting to the Motor on the Passenger side . anybody know if you can remove them and block off the Inlet Pipe ? or is their some internal Passages that will cause problems , Just how does that system work exactly .
Can it be done without removing the Heads
Yes, you can remove the pump and block off the pipe without removing the heads, you may see a slightly worse idle quality, but not real perceptible. I understood you to be a mechanic, thus your question on how the air pump works leaves me somewhat puzzled, but I digress...

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The 1975 Yr Model 450 SEL has Catalytic Converter's under the manifolds. My Catalytic Converters where removed from that location and remounted under the floor it looks like about where your feet rest at the front seat area .
What Manifolds will bolt right on and work best without alterations , something less restrictive if anyone Knows ( Year make Model )
some Photos of the Car as it stands
I will remove the Cats unless That's a Bad Idea performance wise .
Any Input appreciated thanks in advance
It looks like your car already has a set of later-style manifolds and cats (those look an awful lot like the ones on my now-long-gone 1977 450SEL). You can absolutely remove the cats and improve performance noticeably (again, a mechanic is asking this?), however, as others have stated, that may not be legal. You can have a competent muffler shop fabricate you a set of straight pipes, which you can then install yourself.

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post #4 of 9 (permalink) Old 09-30-2014, 09:24 AM
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looking at the pictures , the cats are off the manifold [ replaced by test pipes ] , if no issue there , i would leave it that way .
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post #5 of 9 (permalink) Old 09-30-2014, 11:31 AM Thread Starter
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looking at the pictures , the cats are off the manifold [ replaced by test pipes ] , if no issue there , i would leave it that way .
Some Photos of the "Air Pump " Yes the Cat's Have been Removed from their Original Position under the Manifolds . Note the Really Poor Quality of Air Flow Design of these Manifolds all flat with extreme 90 Degree Bends right out of the Port . looks like poor performance , Heat and Bad Fuel millage perhaps .
Manifold Design looks to be made to cram a Cat underneath it .
Some have insinuated as A " Mechanic I should Know Everything " well I have Learned from Years of Experience that a Lot of Time and Money can be saved by these Great Forums and other places by asking Questions and Getting answers from other's that have already gone " Down that particular road of repair or Up Date " and a lot can be learned . That's part of being a good informed mechanic , not to just forge ahead and buy a bunch of unneeded parts . Are Hundreds of parts on a car and lot's of different Car's and models . To Just dive right in and block something off might be a really unfortunate thing to do and cause damage .
The Manifold's Look Easy to Change but that may be deceiving related to Clearance . I have heard that the 73 and 74 Year models might work but am not sure what models they are talking like a SL Model or SEL Model and such . New Head pipes would have to be made of course .
****
About the Air Pump : My Experience is that Cylinder Heads have different passages inside them to accommodate these Air Pumps . Some suck out unburned Partials and pump them back into the System Yuck .
Not sure just how the 1975 benz 450 SEL Air Pump system works and was hoping perhaps someone might have learned about that already .
About Smog and the Law :
Well a 1975 Year model is" Exempt from Smog Testing " in California now and requires no testing if that answers any interested area's of questions for anyone .
I Know I can Block off the Line going in to the Cylinder head from the Smog Pump . But I don't know what that well perhaps Cause to happen because I have not done or studied such . A forum is a great place to study and you might just learn the answer you need .
Question
Anybody actually done this ? and does the Car run poorly after doing such afterward perhaps ? .
I have read and experienced that this year model has a know rich Idle condition and certainly do not want to exacerbate and such condition perhaps .
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post #6 of 9 (permalink) Old 10-03-2014, 01:49 PM Thread Starter
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Getting back to the Post
What manifolds will fit ? like curvy sexy hi flow Exhaust ports and no frame / steering box interference and the like ?
How about 1973 and 1974 perhaps 450 SEL or 450 SL ?
surely someone knows this ?
the one's on the are are original 1975 MB 450 SEL and very bad .
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post #7 of 9 (permalink) Old 10-03-2014, 02:44 PM
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Getting back to the Post
What manifolds will fit ? like curvy sexy hi flow Exhaust ports and no frame / steering box interference and the like ?
How about 1973 and 1974 perhaps 450 SEL or 450 SL ?
surely someone knows this ?
the one's on the are are original 1975 MB 450 SEL and very bad .
You could try to find some Euro manifolds, but they will be both hard to find and probably fairly spendy. If you don't care about legality, why not have some headers made? Will probably be easier AND cheaper.

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post #8 of 9 (permalink) Old 10-05-2014, 08:28 AM Thread Starter
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You could try to find some Euro manifolds, but they will be both hard to find and probably fairly spendy. If you don't care about legality, why not have some headers made? Will probably be easier AND cheaper.
lol no thanks I will just buy some salvage Units from a non smog / pre smog car for $10 each for the 39 year old car
some hi retail C*** not for me . Related to Headers will I can see them for a race car but most often the warp and begin leaking just not my cuppa Tea but thanks for your useful reply as per the norm
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post #9 of 9 (permalink) Old 10-05-2014, 08:58 AM
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That's not a bad plan. Keep in mind, though, that the very newest W116 of any kind is nowadays 35 years old, so how good those $10 junkyard manifolds will be is somewhat less than certain. By the same token, at $10 a pop you're not risking much either.
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