Help About W115 Fuel Consumption - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 02-11-2010, 06:13 AM Thread Starter
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Vehicle: '76 W116 280SE '75 w115 230.4
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Help About W115 Fuel Consumption

hi all
i have 1976 W116 280SE and i just got W115 230.4 my W116 is taking about 11-13 L\100KM Driving at 90-140 Km\h
the Problem is my W115 is Burning about 13-16 L\100 Km hardly get 140km\H
i Don't think this normal at all Cause W116 is 6Cylin 2800CC and W115 is just 4Cyli 2300
So How is this ?? and what the Normal Fuel Consumption for the W115
Help guys

Last edited by Azkoul; 02-11-2010 at 06:16 AM.
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post #2 of 5 (permalink) Old 02-11-2010, 08:53 AM
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Your 116 is fuel injected, your 115 is carburated. Probably your carb needs adjustment. But these cars are gas hogs.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #3 of 5 (permalink) Old 02-12-2010, 07:01 AM Thread Starter
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Thnx Scoot
But the carburetor is suck i must buy another one and the Engine need Cleaning
it's not a matter of Fuel injection and carburetor
but i still wanna know the Normal Fuel Consumption of w115 i think it's not this thirsty
i will consider buying a M110 i think it fits without any problem
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post #4 of 5 (permalink) Old 02-13-2010, 07:30 AM
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One thing to keep in mind is the M115 is trying to push a heavy car. 100 horsepower to a 1400 KG car. How fast can you run with an extra 14 KG strapped to your back?

My M115 (originally in a 1972 220 and now in a 1972 250C) with twin down-draft Solex carburetors would only get 15 mpg on a good day (sorry, I don't feel up to doing the metric conversion) and top out at about 80 MPH. So, that is actually lower than your 140 kmh. Of course, speedometers vary and an error of 10% is not all that uncommon. It usually averaged about 13 mpg on "in-town" driving and about 17 mpg high-way driving.

The use of proper shift points will help your mileage. Run a vacuum line through the firewall, attach a vacuum gauge and try to keep the needle reading as much vacuum as possible. You'll quickly get a feel for when to shift and the optimum engine speed for the best mileage. It's quite common for people to "over-rev" the little 4 cylinders to attempt to get the acceleration they think the car should have.

The M110 will fit and give you more power. The trade off is if you get the Solex 4A1 you will have even more carb problems. If you drop in a M110 I'd suggest getting an injected engine. Not exactly a "drop-in" installation but it is do-able. The M110 will drop the horsepower to weight ratio to about 9 to 1 as compared to the 14-1 ratio you now have, even lower with the injected engine.

There are alternatives to the 4A1 carburetors.

Help About W115 Fuel Consumption-mb-project-009.jpg

2 BBL carb with adapter plate

or

Help About W115 Fuel Consumption-picture-018.jpg

4 BBL Quadrajet carb (Solex'es are an European licensed copy of the Rochester Q'jet).

Last edited by Mike D; 02-13-2010 at 07:42 AM. Reason: add photos
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post #5 of 5 (permalink) Old 02-15-2010, 03:37 AM
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Original brochure says the 200/8 consume 10.9 litre/100km (combined)

1991 W140 400 SE - SOLD !!
1973 W115 200 -For sale as project.
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