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Atomiser set -PINASCO- Dellorto (type: 5353) SI
Part no.:
PN25293100
Description
The mixing tube (sometimes also called a breaker) of the SI carburettor has a great influence on the quality of the premix. The range of available products reaches from BE1-BE6. The designation of the mixing tubes cannot be used to say which type is richer or leaner. The mixing tubes deliver, depending on the speed and load, different amounts of fuel.
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function of the SI
there is always a defined level of fuel in the SI carburettor nozzle area (depending on the volume in the float chamber). I.e. below the atomizer tube (which opens into the intake area of the carburetor) there is a fuel oil level. For this reason we also advise against the so-called float chamber spacers. These increase the level in the carburetor, but also provide a higher level in the nozzle area, which makes the premixing not work properly anymore and under certain circumstances gasoline may run (flood) from the atomizer directly into the engine. The real problem is not a too small volume of the float chamber but a tuning via the air nozzle. From the very bottom of the float chamber the amount of gasoline flowing into the engine is defined by the main nozzle. In the middle is half in the gasoline, half in the air, the so-called mixing tube (e.g. BE3). From the top, the air nozzle defines the amount of air flowing downstream.
MIXTING TUBE
The feed process in the mixing tube is very complex and strongly dependent on pressure and speed. The mixing tube has various cross holes. These are partly in the gasoline level, partly outside of it in the air area. Depending on the size, quantity and positioning of the bore, a different advance rate behaviour results. It should be noted that there is generally no per se greasing or emaciating mixing tube.
BE4 - BE6 - BE5 - BE1 - BE3 - BE2
In this list, from left to right, the mixing tube is rather greasing at low rotational speed and emaciating at high rotational speed. The whole tilts accordingly and becomes lean at low speed and greasy at high speed. Attention: The mixing tubes have an effect over a very wide speed range. A BE4 mixing tube, for example, greases strongly just above the idle slide valve position. A BE2 on the other hand is relatively lean in the lower expansion range, but greases strongly from the top.
The most common used mixing tube BE3 covers 90% of all applications of the SI carburettor. In addition, the gas slide used should be checked here (see SI slide).
TIP
The combination of air nozzle 160 with mixing tube BE3 is sufficient in almost all cases. If the filter bottom is drilled and/or a resonance exhaust is installed, the mixing tube can be adjusted to BE2 and the air nozzle to 140.
(US)
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€42.99 *
incl. VAT plus shipping costs
Available immediately (delivery time 1-3 working days*)
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