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Originally Posted by Psycho Also the back pressure theory might hold true for most of the cars but on some engines there is a need for slight back pressure due to the cam profiles. The dia of the pipes can also negate the free flow principle by robbing you completely of lowend torque.
You can however run 2 pipes or 4 if planned right will defn improve performance. The easiest approach is to merge into one pipe and then redistribute it to 2 pipes, here one pipe would work as the collector thus causing the least of the worries. |
So you're saying that if you have a high-overlap cam, there's a need for backpressure?
On a different note, Mr. Baban Khan was running a 4-into-4 pipe on his Formula 1300 at the drag....I dont know about the other mods on his engine, but if he was running a very high-lift, high-overlap cam with carburetion/compression to match (I am guessing he wasn't) that's the right setup given the ultralight weight of his car.