Lifetime Premium Member
Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 134 Post(s)
The best solution is to remove the unplug the fuel sender in the trunk and remove the rear view mirror. That should solve most of your problems.
You can look into Megasquirt injection, that might improve your mileage a little, but I really doubt it. These are thirsty cars. I would definitely NOT mess with the mechanical fuel injection if it is working properly. You can find out if it is working properly by taking it to a garage that has an exhaust gas analyzer. The gas analyzer will sniff the exhaust and tell if it is running too rich. But I think that the mileage you are experiencing is consistent with the engine in the car. My 1971 250C has the non-fuel injected engine (same engine I think without fuel injection) and gets the same mileage you are reporting in a lighter car.
You can lighten the car if you go to alloy wheels, either Bundt wheels or W123 aluminum wheels that take the same full wheel cover that the standard wheel takes. Steel wheel = 23 pounds. Bundt wheel = 13 pounds. Aluminum = 11 pounds. Big reduction in unsprung weight, will help more with handling but also some benefit to MPG. I read somewhere that reducing the mass of the wheels by this much was about the same as removing 400 pounds of weight from car. Sort of like lightening a flywheel on an engine/transmission.
Oh, by the way... you should have rear lapbelts. If you don't and want originals, contact me. Are your front belts retracting belts or Kangol magnet belts? I have parts for those (Kangol) also if you need them. There is a decent chance you have rear lap belts that have been pushed under the seat. By 1971 you should have those.
Hello ladies and gents, I quite recently became the proud owner of a 1971 280SE something which I've wanted for years and I dearly love in every way (running or not). The one drawback I can see (besides its lack of airbags, abs, rear seatbelts, etc) is the MPG which I've read is around 11 to 12 normally and 15 at best. It's not only expensive to drive but I feel guilty when I see the exhaust rising through the rear view mirror. Any thoughts on how to improve this? I've read all the usual advice (i.e. make the car lighter, don't accelerate quickly, plan your trips in advance, don't drive period...) but are there any other methods available. It seems that the fuel injectors are adjustable? Is this possible? I'm rather afraid to touch them because of their delicate and expensive nature however if someone else has tried this and succeeded I might be able to as well. any other technologies out there? I'd be grateful if nobody tells me it's impossible as most people used the same phrasing when I asked them if I should buy one in the first place. It's been done and I still don't regret it.
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, ...