How much fuel/h?

Discussion in 'Engine' started by columb, Dec 3, 2008.

  1. columb

    columb Hardcore MB Enthusiast

    Messages:
    461
    Joined:
    May 11, 2008
    Location:
    Exeter, Devon
    Car:
    W212
    Hi,

    I'm wondering how much fuel (diesel) my car uses when I'm worming it up?
    I mean sometimes I have engine on and not driving. Radio on, maybe lights on but that depends.

    I don't think it is much (and I don't care as I don't want to be in cold) but it is good to know :)

    W203, 200CDI :)

    Many thanks!
    Chris
     
  2. kwakdonut

    kwakdonut Hardcore MB Enthusiast

    Messages:
    2,744
    Joined:
    Jul 22, 2006
    Location:
    Highworth, Wiltshire
    Car:
    Frod Mundano TDCi, Kawasaki z650
    Do you mean warming it up, say, on a cold morning??

    More than you think! It's very wasteful to just leave a cold engine idling and doesn't do it any good - thick oil means minimal lubrication. Diesels fair better as the fuel is also a lubricant unlike petrol which is a hydrocarbon and good at washing lubricant off!!

    Anyway, if you don't actually care how much you're using, why ask?! lol

    The more electrical/ancillary load you turn on, the harder the engine has to work and thus uses more fuel.
     
  3. OP
    OP
    columb

    columb Hardcore MB Enthusiast

    Messages:
    461
    Joined:
    May 11, 2008
    Location:
    Exeter, Devon
    Car:
    W212
    And what if engine is warm? No, I don't warm up car and then drive :) (no time to do this) but sometimes I have to wait for my missus and I keep engine running.

    Thanks!
    Chris
     
  4. kwakdonut

    kwakdonut Hardcore MB Enthusiast

    Messages:
    2,744
    Joined:
    Jul 22, 2006
    Location:
    Highworth, Wiltshire
    Car:
    Frod Mundano TDCi, Kawasaki z650
    Obviously, any time you run the engine and not actually drive the car is wasted fuel.
    A couple of minutes? Probably not a great problem
    Half an hour? Depending on the engine could be as much as 1/2 to 1 gallon?
    Anyone else got any thoughts?
     
  5. OP
    OP
    columb

    columb Hardcore MB Enthusiast

    Messages:
    461
    Joined:
    May 11, 2008
    Location:
    Exeter, Devon
    Car:
    W212
    galon for 30 min? I can't really believe it :)
     
  6. Stratman

    Stratman Hardcore MB Enthusiast

    Messages:
    4,534
    Joined:
    Jun 15, 2003
    Location:
    Sunbury
    Car:
    W203 C200 CDI '04Estate
    I have noticed that London taxi cabs waiting at ranks keep their engines running all the time, and not just in the winter.
     
  7. Uberwagon

    Uberwagon Hardcore MB Enthusiast

    Messages:
    753
    Joined:
    Jul 29, 2006
    Car:
    1991 500E
    A modern engine idling, about 50% of not a loto litre.

    Dave!
     
  8. BTB 500

    BTB 500 MB Club Veteran

    Messages:
    18,435
    Joined:
    Aug 7, 2005
    Location:
    Berkshire
    Car:
    R129 SL500, W639 Vito 120, S203 C230
  9. ukcodger

    ukcodger Hardcore MB Enthusiast

    Messages:
    179
    Joined:
    Feb 7, 2008
    Car:
    CLK W209 320 CDI Sport
    Don't do it. Very bad for the car, bad for the environment and bad for character building as now you don't want to be cold on a cold morning.
    I remember.....in my day....... first we had to take the blankets off and then refill the radiator after draining it the night before! Then we could drive off!!
     
  10. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    What about lighting and stoking the fire...
     
  11. Corrado

    Corrado Hardcore MB Enthusiast

    Messages:
    221
    Joined:
    Nov 28, 2007
    Location:
    Sussex Coast
    Car:
    Civit 1.8VTEC
    The little diesel Fiesta I hired last week had an mpg meter that switched to gallons/hour when the car was stationary. With the engine cold it was reading 0.4g/h. Once warm it was 0.1 g/hr. It'd probably be safe to scale that up by 3 - 5 times for a Merc engine.
     
  12. kjay

    kjay Hardcore MB Enthusiast

    Messages:
    998
    Joined:
    Aug 1, 2007
    Location:
    buxton, derbyshire
    Car:
    C200k Coupe 2003
    Car traveling at 40 mph
    Returning 40 mpg

    = 1 gallon/hour.

    So, I'd guess maybe a cup full of fuel for an hour at tickover ??



    Though if you need to 'worm' your car, fuel is the least of your worries.:D

    .
     
  13. yachtman

    yachtman Hardcore MB Enthusiast

    Messages:
    198
    Joined:
    May 11, 2007
    Car:
    clk 320cdi

    Using trucks as an example we estimate 2 ltr /hr for a 4 cyl 150bhp daf 7.5t when warm. Idle time makes a real difference particularly in a multi drop home delivery situation, where the truck will be idled while the driver plugs the next drop into the sat nav. So I would go for the 3-5 multiple as well. 3 for 4 cyl, 5 for the sixes.
     
Tags:

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.