EXHAUST SIZING CALCULATOR 
Engine Model and RPM
Pipe I.D. (Inches)
# of 90º Elbows
# of 45º Elbows
# of Tees
Straight Pipe (Feet)
Silencer Inlet Dia. (Inches)
Silencer Configuration
Attenuation Level
Piping Pressure Loss
(Inches of Water Column)
Silencer Pressure Loss
Total Pressure Loss

(Cummins' limit is 40.8 in. H2O)

Engine Exhaust Sizing Calculator:
This exhaust sizing tool will calculate the total system
backpressure based on the input values of exhaust flow,
exhaust temperature, pipe size, pipe length, number of
elbows and silencer configuration. Silencer restriction
is based on a Cummins Nelson brand silencer. Refer to the
engine data sheet for allowable back pressure limits.

Disclaimer: This calculator should be used for approximation
purposes only. Please contact a Consulting Engineer for
exact or certified calculations.
English/Metric, Metric/English Converter
Feet meter
Inch millimeter
ºF ºC
  Type value to convert in proper box.