header design question
header design question
(OP)
when calculating the optimal primary and secondary lengths for an exhaust system, what options are there in terms of altering the lengths. i.e. is half length ok? quarter length? what are the options/effects?
what other things can be changed?
I used a tool to calculate the target primary length for an I6 engine, and the recommended length before the 3-1 collectors is 36 inches, which space wise would be very difficult. what would be the effects of using 18 inches instead?
If using half length on the primaries, should anything be changed on the length of the secondaries?
what other things can be changed?
I used a tool to calculate the target primary length for an I6 engine, and the recommended length before the 3-1 collectors is 36 inches, which space wise would be very difficult. what would be the effects of using 18 inches instead?
If using half length on the primaries, should anything be changed on the length of the secondaries?





RE: header design question
Regards
Graeme
RE: header design question
There have probably been over a million headers built. You're not going to re-invent the wheel. You need to start with your engine/vehicle requirements and go toward information in that type of use. See what sucessful others have done.
Unless someone has the exact same engine, setup the same way, used for the same purpose, and driven the same way, they cannot tell you what is best. It's fun to play with but too easy to over-engineer things and end up wasting time and money.
RE: header design question
My main question was, if space/packing does not permit the full length that is desired, is there a "compromise" length that is suggested. Instead of just doing "all the same length, but shorter", is there a next target length. As in, if you cannot make something fit that is L, is L/2 acceptable/desirable? Or is it a case of, if its not exactly the calculated length, and must be shorter, any length will be equally bad.
RE: header design question
You might look into buying a "block hugger" or "shorty" type manufactured headers.