![]() When we dyno'd the rallycar BDG (2000, big cams, 55's) last year the differences between emulsion tubes used was very big. ![]() I found that with a relatively mild engine the choice of emulsion tube is not that critical when we dyno'd my first BD (1700, BD3 cams, 40's) the differences in torquecurve with the F9, F11 and F16 tubes was minimal. Unless the mixture accross the rev range is completely wrong do not change to a tube from another family, at least not at first.Īn F7 for example is a completely different tube compared to the F11. If you start with a F11 and need a bit more fuel overall (especially on acceleration), try the F3 as it's a thinner tube. Say if you start of with a F11 and you need a richer mixture on high rpm, try the F15 it has less holes at the high rpm side. If you acnnot find them I will scan these and post them here.Įmulsion tubes (Weber) come in families: for example F1, F2, F3, F5, F9, F11, F15 is a family. Google for pics of all the emulsion tubes from Weber, I have them somewhere but also have the Weber book with all the data for the emulsion tubes. Only thing I would never do is drilling emulsion tubes and also blocking some of the holes in them. New crappy image uploader is actiing up again. I will be tuning with a wideband AFR but just want to know what effect the different emulsion tubes will have, where hey will add or remove fuel in the rpm range as compared to another tube, initially I am using F7's as they were recommended to me, I usually use F11's but the chokes with this setup may require different E tubes than usual The larger the emulsion tube diameter the less fuel can flow to the auxiliary venturi so that would mean the larger the E tube diameter the leaner the mixture at high rpm, is that how it works? I know the fuel is sucked in the main jet at the bottom and up through the holes at the bottom of the tube then fuel flows along the outside of the tube upwards, the holes in the middle and top of the E tubes are where air mixes with the fuel at low-mid to high revs, low rpm being the top of the emulsion tube and the holes in the middle would be for higher rpm, is that correct? When comparing emulsion tube hole placement and diameter of the tubes how does this effect the fuel delivery? The random numbering of weber emulsion tubes is a little confusing to say the least This product was added to our catalog on Tuesday 23 February, 2010.I will be tuning a 2 litre pinto tarmac rally engine soon with twin 50 webers which have a unique set of high velocity chokes, I have a number of different emulsion tubes, F7, F11, F16 and one or two more, can someone tell me what the differences will be on the fuel map vs rpm?Īs I understand it F16 will be rich in the low rpm range, F7 also rich at low rpm but a little less than F16 and the F11's have a more even spread, is this correct? Give your weber carburettors the genuine parts they deserve. Make a habit of asking if they are genuine and where they are from. When purchasing Weber jets and venturi, you are purchasing precision calibrated parts. This is a genuine Weber (European) emulsion tube - NOT a Chinese copy. The Weber tuning manual has may pages dedicated to emulsion tubes with detailed drawings and measurements of the varying emulsion tubes. The thickness of the emulsion tube also has an impact on the amount of fuel sitting in the well surrounding the emulsion tubes. More high holes typically means a leaner mixture under slight accelerations, more low holes is richer. Weber Performance TV - Videos, Reviews & TutorialsĮmulsion Tube - DCOE, 48 IDA, IDF Weber ġ x genuine weber emulsion tube to suit Weber Carburettors ĭCO, DCOE, IDF, 48 IDA & PMO triple barrel carburettors
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