M130 engine - how to get more power? - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 05-23-2012, 09:41 AM Thread Starter
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Vehicle: 1967 250 SL, 1963 220Sb
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M130 engine - how to get more power?

Hi have a 1971 250C with the M130, dual carb (not weber), automatic. Everything is stock. I think it's something like 140 HP. Is there something I can do (or something I can block or disconnect) that will increase the HP and/or economy of this car? I read that the 2.8 engine was used in the 250 coupe because of power sucking smog features in the US...

Not interested in a megasquirt conversion unless I can buy a cut and have it be plug and play.


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post #2 of 2 (permalink) Old 05-25-2012, 12:09 AM
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Hiya there Scoot,

Is everything on the car working? Ignition and carbs perfect? Not sure if you mean you intend to increase power through modification, or if the car is just sluggish for some other reason in general.

Blown secondary diaphragms are common, that will definitely slow things down. The 2.8L should feel somewhat "peppy" off the line and have a strong midrange. '71 still had the higher compression engine.

Fuel economy: I think the best possible is maybe 18 MPG around town, assuming summer weather, perfect tune (synchronization, mixture screws tuned by idle-drop method and CO%), alignment, tires, choice of lubricants, etc. In a warm climate you can get away with adjusting the chokes quite a bit leaner than the book spec.

The emissions equipment on your car is essentially the distributor vacuum box and the dashpot on the rear carburetor, controlled via the SOV's and relay box in the right front inner fender area under the hood. I recommend you leave these intact - they don't affect performance in the slightest. The vacuum retard cuts hydrocarbons (and associated exhaust reek) down at idle, and is instantly dropped upon acceleration. The RPM relay will also crack the throttle plates open a hair on decel via the dashpot, reducing emissions and the amount of fumes you breathe in immediately after coming to a stop. In fact, I would check to make sure this equipment is working correctly, as it makes driving the car a less offensive experience (IMHO, anyway).

ASSuming everything else is working the way it should, valves should be adjusted stone cold on the tight side, and the valve timing should be checked, it's likely a few degrees or more retarded. These two things alone can have quite a dramatic effect on off the line snap and midrange. It also improves fuel economy as your foot isn't into the pedal as much.

Last edited by Leone; 05-25-2012 at 12:44 AM.
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