| There is an optimal exhaust gas velocity. The velocity of the gas is a function of the area of the exhaust pipe cross-section, the volume of gas exiting, and any temperature changes that take place after exiting the combustion chamber. The variable we are concerned with is the area of the cross-section. As that area increases, the exhaust velocity decreases propotionately, but allows a greater volume of gas to escape in a certain time period. As the CFMs increase, the exhaust size must be increased to allow the greater volume of gas to move at the optimal exhaust gas velocity, however too great of an increase in cross section area will result in a slower flow. Given his mods, it has been practically demonstrated that 2.5" piping has better power output (and therefore optimal exhaust gas velocity) than 3" piping.
mkay?
Kenny...
PETZ Member #5
 SteamyZ. Never had did me wrong. - SL103 07/06/04 11:58:15 |
