| The calculations used here generate figures for an ideal exhaust system. You would not use these exact measurements unless you were going to design an engine to operate at only one speed. This exercise is good for showing the amount of compromises you have to make when designing an exhaust system. Change each figure seperatly to see what change is made in the other figures. You can also change the primary pipe length to see the changes in the ideal PRM range. There are many factors in designing an engine for any application. The Exhaust system is only one and probably not the most important one, although many people may disagree. Generally a reduction in primary pipe diameter of 0.125 will move the torque peak down by 650 - 800 rpm in under 2 litre engines.Changing the length of the pipe tends to move the power curve of the engine, around the torque peak. The collector length is for an 8 degree taper collector. The length of the tailpipe is where the pipe ends in the atmosphere or where it meets the muffler. |
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