![]() ![]() In practice these latter types of entry are never used for engine intakes. The flow coefficient of a perfect entry would be 1.0 while the coefficient for a sharp edged entry would be 0.6 and a re-entrant plain pipe 0.5. The acceleration of air flow into a duct is inherently a highly efficient process and the difference between even the crudest radius inlet, and the most aerodynamic shape possible is slight, amounting to no more than a few percent. A longer inlet pipe will create a later intake pressure wave that will help keep the air in the chamber until the intake valve closes.ĭetailed velocity stack working principle However, it is actually that the intake valve is closing too late and the combustion chamber is simply overfilling and blowing back out the intake port, before the intake valve closes. It is commonly related that "stand off" (air–fuel mix that gets pushed back out of the port, usually at full throttle / low rpm) is somehow captured by installing a longer intake pipe (stack). Most current aftermarket stacks are designed to be run "in" the airbox and a company that does research well will have some applications that have all the same length and some applications that have differing lengths of stacks on different cylinders. The length of the stack is known to have a direct effect on a particular engine's boosted power range. Modified engines often have the original air box and associated ducting removed and velocity stacks are installed as accessories. Modify the dynamic tuning range of the intake tract by functioning as a resonating pipe which can adjust the frequency of pressure pulses based on its length within the tract.Allow smooth and even entry of air at high velocities into the intake tract with the flow stream adhering to the pipe walls known as laminar flow.Wheels Alloy wheels for the BMW 2002, from 13″ to 15 inch and 16″.Illustration of the velocity stack principle.Body & Chassis Body flares, air dams and spoilers for the BMW 2002 including turbo fender flares.Clutch/Driveline/Diff A full line of clutch, transmission, differential and driveline parts for the BMW 2002 including parts for the 5 speed upgrade.Ignition & Electrical Distributors, spark plug wires and ignition parts for the BMW 2002.Cooling & Radiators Aluminum radiators, oil coolers, water pumps and cooling-related parts for the BMW 2002.Exhaust Performance exhaust headers, stainless steel exhaust systems, shorty Tii headers for the BMW 2002.Intake/Carbs/Fuel Weber carbs, manifolds, sidedrafts, linkages, fuel pumps and more for your BMW 2002.Valvetrain Performance cams, rocker shafts, valves and springs for the BMW 2002 plus all the rebuilt parts for your cylinder head.Engine Engine parts for the BMW 2002 including performance piston sets, connecting rods and all M10 engine rebuild parts including bearings, gaskets, seals and more. ![]()
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