Calculate optimal exhaust header primary and collector tube diameters and lengths for target powerband using acoustic tuning.
Input Parameters
Results
--
Primary Tube Diameter
in
--
Primary Tube Length
in
--
Collector Diameter
in
--
Tuned RPM Range
rpm
Note: Header tuning uses exhaust pulse pressure waves to create scavenging effect. Longer primaries tune for lower RPM, shorter for higher RPM.
Reference
Primary Dia = sqrt(Cyl_disp(ci) x RPM / 88200) x 2
Primary Length = (V_sound x Exhaust_open x 60) / (RPM x 2 x 2) - 3
Collector Dia = Primary Dia x sqrt(N_primaries) x 0.7
Tuned RPM Range = 0.7-1.05 x Peak RPM