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Car Forum / MINI / September 2003Since setting the carb she's become a fuel guzzler!
since I found the apparently best needle for my stage 1'd mini and set the carburation, the car just guzzles down fuel as it never had. Any clues on what the problem could be? The carburation is about right, did the job with a colortune plug. when I set the carb to what it is now I also used 10W40 oil in the dashpot damper. I'm pretty sure that the previous oil that was used was much thinner, I can really feel the difference when lifting the piston by hand. could this affect the fuel consuption? I've also been using high (99) octane petrol since. cheers dantiri > since I found the apparently best needle for my stage 1'd mini and set the > carburation, the car just guzzles down fuel as it never had. Any clues on [quoted text clipped - 7 lines] > > dantiri Did you get the new needle based on the 99 octane fuel? > since I found the apparently best needle for my stage 1'd mini and set the > carburation, the car just guzzles down fuel as it never had. Any clues on [quoted text clipped - 7 lines] > > dantiri I would have thought that the original needle would have been close for a stage one. When you bought the needle did you get the spring to compensate for the needle. Try putting the original needle back and tell us what happens then. What carb are you using and what needle? Cheers, Kelley >since I found the apparently best needle for my stage 1'd mini and set the >carburation, the car just guzzles down fuel as it never had. Any clues on [quoted text clipped - 7 lines] > >dantiri > What carb are you using and what needle? HS4 carb with AAA needle Dantiri > Cheers, > > Kelley And Dantiri was sitting next to Elvis in the spaceship, which I thought was kinda strange, but then they turned to me and said: > > What carb are you using and what needle? > > HS4 carb with AAA needle AAU is usually taken as the baseline for Stage1 998s.  Signature(-AD-) <uniqueid 'at' lineone.net> http://website.lineone.net/~uniqueid/ 'A not-annoying version of Steve Jobs' - Captain Busternaut. Just as a point of comparison, 1275 GT engines with an HS4 used an AAR needle. The AAA needle is much, much richer than an AAR. In fact the AAA would only be good for a highly tuned 1275 not full race but getting close. My guess is that your running really rich at part throttle. Cheers, Kelley >> What carb are you using and what needle? > [quoted text clipped - 5 lines] >> >> Kelley > Just as a point of comparison, 1275 GT engines with an HS4 used an AAR > needle. The AAA needle is much, much richer than an AAR. In fact the > AAA would only be good for a highly tuned 1275 not full race but > getting close. They did?!? Both of mine had/have ABB's! AAR looks to build to be noticably richer at half way and about the same at the tip. I just drove home in rush hour traffic 'the back way', lots of tight corners and all uphill! It was fabulous!!! - man I love my car :) >>Just as a point of comparison, 1275 GT engines with an HS4 used an AAR >>needle. The AAA needle is much, much richer than an AAR. In fact the [quoted text clipped - 8 lines] > I just drove home in rush hour traffic 'the back way', lots of tight > corners and all uphill! It was fabulous!!! - man I love my car :) Don't forget to look at WinSU for needles http://homepage.ntlworld.com/sbeavis/winsu/winsu.html AAR is what SU list for '71 1275GT and part of '72. 1972 and later (unsure how much later) used the ABB. Just in case anyone is interested the Haynes SU manual is well worth the money. It's pretty easy to compare needles and in addition there is an applications list that allows you to look up a larger engine size and get a feel for a good starting point in needle selection for your modified engine. There is also a list of Works specs for various cars. Cheers, Kelley >> Just as a point of comparison, 1275 GT engines with an HS4 used an AAR >> needle. The AAA needle is much, much richer than an AAR. In fact the [quoted text clipped - 8 lines] >I just drove home in rush hour traffic 'the back way', lots of tight >corners and all uphill! It was fabulous!!! - man I love my car :) > since I found the apparently best needle for my stage 1'd mini and > set the carburation, the car just guzzles down fuel as it never had. There are a few ways to make a car use lots of fuel, but most of the really effective ones involve poorly adjusted carburetion - and you say you've just been working on the carby..... > Any clues on what the problem could be? The carburation is about > right, I bet it's not.... 8-) > did the job with a colortune plug. A few minutes with a gas analyser will soon tell you if it's anywhere near right. > when I set the carb to what it is now I also used 10W40 oil in the > dashpot damper. I'm pretty sure that the previous oil that was > used was much thinner, I can really feel the difference when lifting > the piston by hand. could this affect the fuel consuption? The dashpot damper oil only affects transient response. > I've also been using high (99) octane petrol since. This should not matter. |
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