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  #1  
Old 05-22-2015, 11:50 PM
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factory supercharged 220D?

Has anyone ever saw or heard about the car mentioned in this document?

Document Display | NSCEP | US EPA

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  #2  
Old 05-23-2015, 04:08 AM
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Well I've not come across that before - I get the impression this was an aftermarket addition - I've downloaded the PDF to read all about it though!
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Old 05-24-2015, 06:53 PM
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I went ahead and read the whole thing. Factory prototype. It had some good things about it but as we know Mercedes went with a regular turbocharger a few years down the road.
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  #4  
Old 05-25-2015, 06:12 AM
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Nice one

Wow yeah - just read it too (!) - it was built by Mercedes using a bit of an odd ball supercharger =>

Pressure wave supercharger - Wikipedia, the free encyclopedia

It is more of a turbo charger supercharger thing than a pure supercharger as exhaust gas is used to compress the air going into the engine (and yes it can mix a bit)...

...the drive from the engine seems to be used for timing more than it is used for pushing air into an engine.

Mercedes lent it to the people who wrote the report so they could compare it with a 240D. All of their tests were done on a rolling road - so they complained about the whine of the supercharger with the hood open, which probably is not a problem in normal use!

What I found interesting was the modifications Mercedes made to the 220D to allow for supercharging =>



This is the same work they did to the OM617 to make the OM617a so they must have been playing around with these ideas for some time.

The story of the OM617a development is given in an SAE paper (which I can reference if anyone wants to find that at their local library)
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factory supercharged 220D?-modifications-made-220d-engine.jpg  
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #5  
Old 05-25-2015, 08:43 AM
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I worked at the EPA lab during the time this testing was performed though I didn't work on this particular project. Later on I had significant dyno seat time in the 240D shown in the pics (it was chocolate brown) as it was used to run aftertreatment (often called "catalyst") testing.

Anyhow, the Comprex was an experimental system provided by (IIRC) Mercedes though they didn't make the device. As I recall the Agency was OK with this device though Mercedes decided not to produce it.

Bottom line - don't go looking for one of these. Only a few were built and fewer made it to the US. To the best of my knowledge none were US-spec and therefore were either sent back to Germany or destroyed at Mercedes' discretion.

It was an interesting job.

Dan
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Old 05-25-2015, 12:56 PM
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Quote:
Originally Posted by Dan Stokes View Post
I worked at the EPA lab during the time this testing was performed though I didn't work on this particular project. Later on I had significant dyno seat time in the 240D shown in the pics (it was chocolate brown) as it was used to run aftertreatment (often called "catalyst") testing.

Anyhow, the Comprex was an experimental system provided by (IIRC) Mercedes though they didn't make the device. As I recall the Agency was OK with this device though Mercedes decided not to produce it.

Bottom line - don't go looking for one of these. Only a few were built and fewer made it to the US. To the best of my knowledge none were US-spec and therefore were either sent back to Germany or destroyed at Mercedes' discretion.

It was an interesting job.

Dan

That's so cool.

"Oh yeah i was there, no big deal."

I find all this early turbo stuff fascinating. What led to the 617 turbo. And would love to get my hands on any of it. There was an aftermarket turbo kit also but not sure if it hit production.
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  #7  
Old 05-25-2015, 01:02 PM
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Quote:
Originally Posted by Lucas View Post
...There was an aftermarket turbo kit also but not sure if it hit production.
A few companies such as AMG did it

Once and for all the answer to the did AMG do diesels for the w123 - Mercedes-Benz Forum

before they got swallowed up by Mercedes.
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #8  
Old 05-25-2015, 01:28 PM
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Yeah I've read about that one. I want one. You loose the governor though.
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  #9  
Old 05-25-2015, 03:22 PM
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That is one cool document! What a complex design of supercharger, I doubt the longevity of it suited Mercedes diesels in the end (meaning it would be frequently replaced). Interestingly the supercharged one got better fuel economy and better acceleration. except at idle it consumed more fuel. It would have been even more interesting if they were able to compare a 220D for each test rather then a 240D.

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