Estimate muffler backpressure based on internal design type, flow volume, and exhaust pipe diameter.
Input Parameters
Results
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Pipe Gas Velocity
ft/s
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Muffler Backpressure
psi
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Estimated HP Loss
hp
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Sound Reduction
dB
Note: Straight-through mufflers offer best flow but least sound reduction. A total system backpressure under 2 psi is ideal for performance applications.
Reference
Pipe Area = pi x (Dia/2)^2 / 144
Gas Velocity = Flow / (60 x Area)
Backpressure = Coeff x Velocity x Length / 12
Coeff: Chambered=0.012, Straight=0.006, Turbo=0.009
HP Loss = Backpressure x Flow x 0.004