MichaelPGriffith
Automotive
- Oct 11, 2010
- 21
Gents, the plethora of exhaust diameter calculators available online are giving me a wide variety of ideal primary diameter, and that's a problem; there's only one ideal.
I'm working on cam and exhaust manifold designs for a 3.5 V6. In a recent thread there are some equations but they seem to be specifically for 4 pots and 4-2-1's attached to them.
Does anyone have a reference to a good reliable equation that will help me keep my exhaust gasses moving in the 250-280fps range?
Or, if it's simpler; the engine is a 3500cc V6, 4-valve, 30mm exhaust valves, and I would like to keep the primaries in the 21-24" range. I'll buy shelf 304SS bends for the manifold construction, so there is a limit to available variety. I'll either go stepped 1 1/2" to 1 5/8", 1 5/8" to 1 3/4", or 1 3/4" to 1 7/8". I want them to flow respectably up to 8200rpm.
Thanks in advance for any thoughts and input.
I'm working on cam and exhaust manifold designs for a 3.5 V6. In a recent thread there are some equations but they seem to be specifically for 4 pots and 4-2-1's attached to them.
Does anyone have a reference to a good reliable equation that will help me keep my exhaust gasses moving in the 250-280fps range?
Or, if it's simpler; the engine is a 3500cc V6, 4-valve, 30mm exhaust valves, and I would like to keep the primaries in the 21-24" range. I'll buy shelf 304SS bends for the manifold construction, so there is a limit to available variety. I'll either go stepped 1 1/2" to 1 5/8", 1 5/8" to 1 3/4", or 1 3/4" to 1 7/8". I want them to flow respectably up to 8200rpm.
Thanks in advance for any thoughts and input.