![]() The same applies to the flow of the tall CSP Products velocity stacks when combined with the 100 mm CSP Products air filter housings. Of course, the notch – which is not necessary in the tall version – has no measurable influence on the flow. This saves time and trouble when jetting the carbs. ![]() They ensure that you can unscrew the emulsion tubes without any problems even with the stacks installed. These include, for example, off-centre notches in the inlet of the short and medium-tall stacks. In addition, they have unique features, which you will not find elsewhere in this combination. This provides a measurable advantage over universal stacks. The inner geometry of the IDF carburettors was precisely taken into account – of course also in conjunction with our CSP Products air filter housings. In contrast to other velocity stacks, the optimized contour and inlet geometry of the CSP Products models, which consists of various radii and cones, have been specifically developed for use on Weber IDF dual carbs. What makes CSP Products velocity stacks so unique? One thing applies to all three versions: Whatever losses arise at the beginning of the intake plenum cannot be made up for later, even with the best ported and polished heads. In this case, they measurably increase the torque. For example, a Bus engine that is designed for torque with an appropriate camshaft should have tall CSP Products velocity stacks. In principle, a long velocity stack ensures higher torque at a lower nominal speed, while a short stack is ideal for high-revving engines and ensures better performance at higher rpm. In addition, the length must match the timing of the camshaft used. Consequently, shape and length of the CSP Products velocity stacks have a positive effect on the flow rate and the engine characteristics – especially hidden under air filters! It extends not only between the valve seat and the carburettor, but also up to the edge of the velocity stack. No, they mainly are used to influence the length of the intake plenum. Velocity stacks are not just used for looks, as one might assume. How do CSP Products velocity stacks affect performance? also fit various air filter housings available in our shop.perfectly matching CSP Products’ air filter housings.off-centre notch on the inlet for easy dismantling of the emulsion tube (not on the long version). ![]() each diameter is available in three different heights (22, 52 and 84 mm).individual versions for 36, 40 and 44/48 Weber IDF carburettors.CNC turned from high-strength aluminium, which makes it particularly thin, yet sturdy.developed with the support of a CFD software and a flow bench.Specifically designed for Weber IDF dual carbs and developed with the help of the latest software – the CSP Products velocity stacks set new standards thanks to their features!
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