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  #1  
Old 03-21-2004, 09:36 AM
TonyFromWestOz's Avatar
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Location: Perth, Western Australia
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3 MB 300D sedans, '80, '82 & '84 the '80 is the fastest -

One PO of the '80 said that it was the exception to the rule that the 617 motor was Sssssllloooooowwww.
These 3 cars have 229 000, 370 000 & 280 000 km respectively.
The '80 will eat the other 2 in all conditions.

I am swaping this motor into the '82, and will check & remedy IP timing & timing chain stretch before removal.

What else could contribute to the '80's good performance relative to the '82 & '84? Or conversely, their poor performance Vs the '80?

BTW, all 3 are non-turbo & W123 sedan body.

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Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.
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Old 03-21-2004, 09:50 AM
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gearing? check RPM at steay set speed.


It's been my experience that some diesels just get a certain fuel mileage and have a certain amount of power and you can only do so much to alter it short of motor injector/pump/head work.
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Old 03-21-2004, 10:13 AM
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I feel that my '81 is a lot more "peppy" than the turbo cars. Something about the combination of the torque curve and the tranny shift. Great car around town or on 55 mph two lane blacktop roads. Gets better fuel mileage than the turbo models too - probably because I run them at higher speeds.
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Old 03-21-2004, 10:50 AM
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No Tacho on any of these cars

So I cannot compare RPM @ set speed. I will check out the Diff ratio on each. IIRC from reading on this forum, it is stamped on the front of the diff housing adjacent to the pinion gear.
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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.
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Old 03-21-2004, 01:06 PM
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I don't understand. 82 & 84 300D's are supposed to have a tach and a turbo. You're saying all 3 of them have no tach and no turbo?
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Old 03-21-2004, 01:16 PM
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I might be wrong, but if I recall, only North America received turbo 123 cars in the form of a sedan. Europe only got turbo 123 wagons.

Our friend is in Australia.
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Old 03-21-2004, 08:30 PM
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Oh yeah, I didn't notice that he isn't in the US. It makes sense now.
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Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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Old 03-21-2004, 08:43 PM
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Re: 3 MB 300D sedans, '80, '82 & '84 the '80 is the fastest -

Quote:
Originally posted by TonyFromWestOz
it was the exception to the rule that the 617 motor was Sssssllloooooowwww.
What rule? Granted mine's a turbo, but once I got my throttle linkage properly adjusted, my 617's actually the fastest diesel I've owned. I will admit that every one of my other diesels have been in trucks, but it's probably on par with my old straight-6 Chevy (one of only two g@$$ers I've owned; the other was a VW Bug with 40 whole horsepower) for acceleration, and I get better mileage and don't have to worry about the car breaking down every week.

I agree with the others; chances are the difference is in your differential gear ratio. This also means that you have higher cruising RPM's on highways with that car, unless you've got 5 speeds in the other cars *drooling*
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1991 Ford F-350, work in progress
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  #9  
Old 03-22-2004, 07:00 AM
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I climbed up underneath the '81 yesterday and no wonder - the rear end is a 3.4x rear while the '85 is a 2.88. That is why the '81 feels more "peppy".

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