Leon Posted January 18, 2013 Share Posted January 18, 2013 One data point... The intake manifold built for my old race car was designed for torque. Plenum was exactly 1/2 of total displacement (1.5L plenum for a 3L engine), runners were 7.5" long and tapered from a 1.75" air horn inside the plenum to the port size. The tape started 2" from the plenum so the actual length of the taper was 5.5". TB was 65mm. The engine made at least 200 ft. lbs. of torque from about 4,000 to 7,500 rpm. Torque peak was about 275 but I forget where - its posted somewhere here on HybridZ. Nice! That long taper is what gives you the nice, flat torque curve. Quote Link to comment Share on other sites More sharing options...
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