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Old 05-29-2002, 10:58 AM
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79 300cd


I am back in the diesel business again. I have a 79 300CD that I picked up with broken timing chain. It basically needs a rebuild as the valves are bent and I suspect piston damage. It a non-turbo diesel and I was wondering what would have to be changed to put in a turbo diesel.

Is their major top speed difference between turbo and non-turbo?



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Old 05-29-2002, 12:04 PM
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Exclamation to turbo or not to turbo?

Great Idea however, the turbo 617 motor has many differences that are not visually seen. The pistons have oil channels to help cool them better, they are a harder metal piston than the non turbo type. The injectors are set up to deliver more fuel for the turbo, exaust manifold is different. From my research, the best way to change from non turbo to turbo would be to buy,rebuild, a turbo motor to swap out. It would be too difficult to set up the non turbo engine to accept the turbo. I hope I didn't "let the air" out of your plans. CD in SC
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Old 05-29-2002, 12:32 PM
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Engine Swapping


Sorry. What I meant to say is how hard would it be to swap out a non-turbo vs turbo motor. I am not trying to rebuild a non-turbo into turbo as this is not possible.

I am wondering what significant changes are need to put a turbo motor in this non-turbo car.


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Old 05-30-2002, 08:15 AM
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Thumbs up 617 turbo

This should be pretty strait forward. Sorry I don't want to tell you something that I have no experience with, I would think that swapping would not be much of a difference. The exaust in the parts book show all different parts from the manifold back. Let us know what you decide. goodluck CD in SC:p
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Old 05-31-2002, 06:36 AM
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In addition, I believe the final drive ratio is different... but that is not critical. Down the road, if you wish to have lower revs on the highway and better economy, considering swapping the diff.

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Old 05-31-2002, 10:21 AM
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Besides the higher ratio final drive makes a snappier car off the line + the addition of the turbo.

(higher? or is it lower?...:p)
2008 BMW 335i Coupe
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Old 06-03-2002, 01:26 PM
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Join Date: May 2001
Location: Charleston, SC
Posts: 237
If you attempt, keep us informed of whats involved as my eye is always out for a CD and one with a bad motor would be great if priced right and I would likely be attempting the same thing.

IMO, if you can find a wrecked one with the motor you want to tow home, the switch with all necessary components would be a relative piece of cake.

Good luck.
2008 GL320CDI 6K
1970 280SL 112K
1982 240D 210K (Sold)
1973 220D 220K (Sold)
1967 200D 160K (Sold)
1992 400E 139K (Sold)
1988 300E 148K (Sold)
1987 300D 257K (Sold)
1991 300E 108K (Sold)
1987 300E 131K (Sold)
1978 300D TMU (Sold)
1980 300D TMU (Sold)
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Old 06-03-2002, 07:49 PM
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Location: Atlanta, GA
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Exhaust system is different, but the correct system should bolt up.

Different rear-end gear ratio, and I think the gear ratios in the transmission are different too, even though it will bolt up fine. May not be enough of an RPM difference to be a problem, but I'm not sure.

Maybe you should post this in the Tech Help forum, so maybe
Benzmac or one of our other respected gurus might see it and be able to be more specific.


1979 300 SD
350,000 miles
1982 300D-gone---sold to a buddy
1985 300TD
270,000 miles
1994 E320
not my favorite, but the wife wanted it
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