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  #1  
Old 10-03-2004, 10:07 PM
SomaPusher
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more oomph...

I have a '75 300d with 120,00 original miles. The car drives great, no issues with it. I just want to know how I can get more HP.

Change to electric fan?
Bigger exhaust diameter?
Change timing?
Change can timing?
Anything else?

Thanks
-Eddie

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  #2  
Old 10-03-2004, 10:22 PM
sixto's Avatar
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Yellow tape, decals and melon shooter exhaust tips do wonders for Hondas

Seriously, sell and buy a 82-85 300D turbodiesel.

Although converting from AT to MT technically doesn't increase engine performance, it makes a 115 Diesel more pleasant to drive.

Please don't ask about hanging a turbo on your current engine unless it's just for looks.

Sixto
95 S420
87 300SDL
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  #3  
Old 10-03-2004, 10:39 PM
whunter's Avatar
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Hmmm

Quote:
Originally Posted by SomaPusher
I have a '75 300d with 120,00 original miles. The car drives great, no issues with it. I just want to know how I can get more HP.

Change to electric fan?
Bigger exhaust diameter?
Change timing?
Change can timing?
Anything else?

Thanks
-Eddie
Buy a Viper and sell your MB.
The reality is:
I think you can boost it 10 hp for $7,000.00 if it is really worth it to you.
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  #4  
Old 10-03-2004, 11:05 PM
SomaPusher
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....just asking, damn.
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  #5  
Old 10-05-2004, 02:21 PM
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Quote:
Originally Posted by SomaPusher
I have a '75 300d with 120,00 original miles. The car drives great, no issues with it. I just want to know how I can get more HP.


-Eddie
My '76 300D performs pretty good- lot's of that Diesel "ass-haulin'" feel. Did you get this car recently? I've only had mine a month or so and one of the first things I learned was that these cars start off in 2nd gear, unless you manually select "L"- this makes a huge difference in "scoot" especially when starting off on a hill.

Dave
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  #6  
Old 10-05-2004, 03:31 PM
R Leo's Avatar
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Quote:
Originally Posted by SomaPusher
I just want to know how I can get more HP.
By all means, make sure that you are getting every bit of the 90something horsepower you are supposed to have. First, check/replace your fuel filter/strainers (there are three...a dirty or plugged fuel filter will keep a diesel from producing full power). Second, check for timing chain elongation and correct the problem if there is any (plenty written in this forum about chain elongation). Third, confirm that the valves are adjusted and have proper clearance (an oft overlooked thing on MBZ diesels with lots of miles). And, finally (and particularly if the timing chain is changed) confirm that the IP timing is correct.

As for radical power increases, physics and design are working against you. These are short stroke, small displacement diesels. They're made to be efficient, spin lots of revs and, unfortunately, not make a lot of torque....the oomph you feel starting off from a light. Your engine is normally aspirated (no turbo). Air and fuel make diesels go; with the engine doing the sucking instead of a turbine-powered compressor doing the blowing, only so much air is ever going into that engine and only so much power (or, oomph) is going to come out. Thus, a bigger exhaust will have little effect. Finally, these cars were designed to be efficient, utilitarian vehicles, something they excel at. Face it, when was the last time you saw a running, 1975 Buick, Olds, or Cadillac that got 25+mpg and was still as solid as the day it came off the production line??

My advice, look at (or have a knowledgable indy look at) the things I've listed above and get them fixed if necessary.

The OM617.912 engine is a remarkable piece of engineering, capable of running in excess of 250,000 miles with only routine maintenance. Additionally, the W115 chassis was well ahead of it's time with 4-wheel power assisted disk brakes and fully independent suspension. Appreciate your 300D for what it is and adjust your HP expectations accordingly.

FWIW, Converting to a manual tranny improves driveability but it is a project well beyond the bolt on level of performance enhancement.

Take care.
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Last edited by R Leo; 10-05-2004 at 11:16 PM.
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  #7  
Old 10-05-2004, 03:49 PM
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Check to make sure the throttle linkage is allowing the engine to rev completely. My 240D must have gained about 15 hp when I adjusted the linkage to max out. Over time I think they get sloppy.
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  #8  
Old 10-05-2004, 05:19 PM
mb123mercedes
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Pull engine and drop in a 300 Turbodiesel.

Louis.
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  #9  
Old 10-05-2004, 05:24 PM
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Quote:
Originally Posted by mb123mercedes
Pull engine and drop in a 300 Turbodiesel.
Not a bolt-in solution for the W115 chassis.
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  #10  
Old 10-05-2004, 07:53 PM
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This is good advice in this thread. Learn to do your own work and keep the car running the way it is supposed to run. Learn to drive the car the way it is supposed to be driven and enjoy it for what it is.

My better half and I have adjusted to our NA 300D and both love it. Her favorite part of driving is sprinting away from red lights and she still loves it.
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  #11  
Old 10-06-2004, 12:41 AM
SomaPusher
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thank for the info y'all. don't get me wrong i did not expect to make a race car out of it, i just wanted to know if i could get a little more out of it. I'll check the motor out and get it back to spec. is it hard to work on them your self??


-Eddie
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  #12  
Old 10-06-2004, 01:32 AM
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Talking :shock:

Quote:
Originally Posted by SomaPusher
Is it hard to work on them yourself??
-Eddie
No, much easier than gassers.....
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  #13  
Old 10-06-2004, 02:08 AM
Diablo-Diesel
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more el-zip-ola

Hi eddie and welcome!
what I'd do is eirther buy a 80-84 w-126 300sd turbo, and keep your current mb, or use it as a trade-in. you may want to look into something like eirther propane, or water injection. its like the other stated, these are short stroked engine's, and well maintained, they will flat run down the road. if ya want a quicker mb, or just a faster mb, change the coggs for what ya want. enjoy

chip
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  #14  
Old 10-06-2004, 10:33 AM
mb123mercedes
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Quote:
Originally Posted by R Leo
Not a bolt-in solution for the W115 chassis.

Nobody said that getting more Hp's is easy or cheap.

Louis.

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