Quote:
Originally Posted by scdyne
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.
I'll jump in since I am doing the fabrication on the headers.
Having a merge collector would be ideal, even doing as you suggested trying to incorporated it into the bent parts during fabrication, but with the limited amount of room and not having a tighter bend to facilitate the procedure it's just not going to happen, at least not with these short headers.
When we bend parts for headers there is a certain amount of space between bends that we can do nothing about, (just the capabilities of the machine )
Our goal is to have a quality built header that will bolt up to the stock converter and that is not outrageous in price.
I know Burns has a short merge collector, but that would still be next to impossible to fit into the design that I have come up with, with the limits that I had to work with and stay within our target price. I could build one, but the price that we would be asking would not go over well for the majority, especially for what the limit that a short header is going to be capable of.
Best possible gains are always best when you have the space to do it in.
Like my partner had said you brought up some good points, no disagreement there.
Thank you for your input.