Help About W115 Fuel Consumption - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 02-11-2010, 05:13 AM Thread Starter
BenzWorld Junior Member
Azkoul's Avatar
Date registered: Jan 2010
Vehicle: '76 W116 280SE '75 w115 230.4
Location: Alexandria
Posts: 5
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
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 05:16 AM.
Azkoul is offline  
Sponsored Links
post #2 of 5 (permalink) Old 02-11-2010, 07:53 AM
Lifetime Premium Member
Scoot's Avatar
Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Posts: 2,683
Mentioned: 3 Post(s)
Quoted: 134 Post(s)
Lifetime Premium Member
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, ...
Scoot is offline  
post #3 of 5 (permalink) Old 02-12-2010, 06:01 AM Thread Starter
BenzWorld Junior Member
Azkoul's Avatar
Date registered: Jan 2010
Vehicle: '76 W116 280SE '75 w115 230.4
Location: Alexandria
Posts: 5
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)

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
Azkoul is offline  
post #4 of 5 (permalink) Old 02-13-2010, 06:30 AM
BenzWorld Veteran
Date registered: Aug 2009
Vehicle: '72 250C, '74 280C, '85 500SEL, '81 300CD.
Location: Tucson, Az.
Posts: 725
Mentioned: 3 Post(s)
Quoted: 72 Post(s)
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


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 06:42 AM. Reason: add photos
Mike D is offline  
post #5 of 5 (permalink) Old 02-15-2010, 02:37 AM
BenzWorld Extremist
Eirik 400 SE's Avatar
Date registered: Jan 2008
Vehicle: 1973 W115 200 /8
Location: Norway
Posts: 895
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Original brochure says the 200/8 consume 10.9 litre/100km (combined)

1991 W140 400 SE - SOLD !!
1973 W115 200 -For sale as project.
Eirik 400 SE is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Topic Author Forum Replies Last Post
How is better for fuel consumption: isarescu R170 SLK-Class 3 02-01-2008 01:21 AM
fuel pump affecting fuel consumption? rich369 W140 S-Class 0 11-22-2006 08:32 PM
Fuel issue in 75 250D w115 Dr Evil Vintage Mercedes-Benz 1 10-22-2006 07:08 AM
Fuel consumption Guest (MBNZ) W203 C-Class 8 08-06-2001 06:05 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Title goes here

video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome