300 D performance and mpg - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 08-27-2006, 04:40 PM Thread Starter
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Vehicle: 1983 300SD Turbodiesel
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Question 300 D performance and mpg

Hey Dudes,

While prowling my favorite boneyard yesterday I noticed an MB 300 D. Still looked largely intact. I thought I counted 6 cylinders, and it appeared to have fuel injection of some kind(I'm into Merkurs, and don't know much about MBs). Anyhow, with gas prices as high as they are, I've been thinking about converting(to diesel) and was wondering what(if any) kind of performance mods a motor like this would tolerate(turbo). And what kind of MPG could I get with a 3500-4000lb car(the motor would go into one of my Merks or LOL, my 76 Ford Maverick :<0 That would be hoot). Heck what kind of MPG did they get back in the day???
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post #2 of 4 (permalink) Old 08-28-2006, 09:09 PM
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First off, all diesels are fuel injected. I never understood why until I saw a nifty animation of a diesel (sorry, can't remember where). If it was a 300D, then it most likely had 5 cylinders, which are absurdly reliable (see my miles?) if it was turbo then it would say turbodiesel on the back. I get 23mpg with my naturally aspirated 3 liter 77hp engine (I think somethings wrong) because it should get about 30. If it DID have 6 cylinders then it was probably a 350SDL. As for performance, there definately is a lot you [I]could[I] do, but plan on spending money, and lots of it if you want to go really fast. You could offset the expense by running (used) vegatable oil - the original diesel - which is free. IMO, the turbos are fast enough as is, and the first thing you should always do to gain performance is rip out the carpeting, A/C, back seats, convienence motors, ect. anyway. The first time I drove a diesel Benz I knew I had to have one, always. They are crazy reliable, it's like a part of your family. But that's enough of my ramblings, have fun!
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post #3 of 4 (permalink) Old 08-28-2006, 09:18 PM
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LOL . { the first thing you should always do to gain performance is rip out the carpeting, A/C, back seats, convienence motors, ect. anyway }

Yeah , remember the tale of the tortise and the hare?

The MB diesel is definately the tortise .. but we love ours . Wifes car has just gone 380,000 and is still strong. Body will rot away first I think.

The turbo engine is special , just dumping a turbo on a normally aspirated will shorten its life.

I find a different mind set is required to be happy in a diesel .. think ------------------------------------- we will get there eventually -------------------------------- isnt the scenery beautiful --------------------------------------------------- look a broken jappa ------------------------------------- ahhhhhhh .

'76 - 300D
'72 - 240D (noddy)
'40 Chev pickup
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post #4 of 4 (permalink) Old 09-02-2006, 06:46 AM
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I got 29-30 on 84 300D up to 388,000 miles. Very econimical.

Prior cars>1961-220s, 1973-280SL, 1980 240, 1984 300D (388,000)

Present cars> 1983 380SL, 1995 300 (commutor car)
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