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A properly configured CFD will in fact calculate scavenging, but only based on the model used. However taking that 3D model of a header and duplicating it in the real world is another level of complexity most manufacturers cant and don’t address. So you are back to design and tooling limitations and confines of the engine compartment for the most part.

I could debate both the actual cost and benefit of a merge vs. formed collector too, but it’s again a factor of the above issues. Maybe you could also build a miter cut merge header and run it on a dyno with your current design and see how much difference it makes. I know that in the 2.0 LSJ it results in a difference of twice the performance gains of similar shorty header designs (10vs20HP gain), but that’s a supercharged engine. It’s possible you can work in the miter to the current design as another bend step. Then it’s a matter of welding from that point on and the difference between a header that makes 8 HP over stock and one that makes 14HP over stock for the same price.
I’m not being presumptuous about anything I’m doing either I’m making suggestions that can potentially help things along. A little extra work now is less expensive than a lot of hassle later.

__________________
-Adam Chant
SCdyne Performance Engineering
"Tune it or lose it!

TEAM SCSKYSC 2008
I don't know..?

	scdyne Member Join Date: Oct 2005 Location: so-cali - Between Willow and LACR	A properly configured CFD will in fact calculate scavenging, but only based on the model used. However taking that 3D model of a header and duplicating it in the real world is another level of complexity most manufacturers cant and don’t address. So you are back to design and tooling limitations and confines of the engine compartment for the most part. I could debate both the actual cost and benefit of a merge vs. formed collector too, but it’s again a factor of the above issues. Maybe you could also build a miter cut merge header and run it on a dyno with your current design and see how much difference it makes. I know that in the 2.0 LSJ it results in a difference of twice the performance gains of similar shorty header designs (10vs20HP gain), but that’s a supercharged engine. It’s possible you can work in the miter to the current design as another bend step. Then it’s a matter of welding from that point on and the difference between a header that makes 8 HP over stock and one that makes 14HP over stock for the same price. I’m not being presumptuous about anything I’m doing either I’m making suggestions that can potentially help things along. A little extra work now is less expensive than a lot of hassle later. __________________ -Adam Chant SCdyne Performance Engineering "Tune it or lose it! TEAM SCSKYSC 2008 I don't know..?