Shawn's back to tell you everything you've ever wanted to know about stepped headers. www.rinehartracing.com #americanpipesforamericanbikes #rinehartracing.com
I wish he hadn’t said “everything i ever wanted want to know”. I wanted to know so much about these thingys and yet this video is two minutes long and basically just a definition of this concept generally. smh!!
@@rinehartracing4419how do you determine primary size & what size the step needs to be? Does it depend on engine size? How well the heads flow? What about header length. Starting at the flange, where you need the steps to start in order to make a difference & just overall length in general? Do 8-1 rotary fire on a V8, 6-1 on V6, headers make a difference with or without steps still make a difference? Or would having a normal 4-1 & 3-1 on each bank work just as good or better? I'd really like you guys to get into the technical details of it all.
This isn't everything I ever wanted to know about stepped headers. Its not even everything I already know. But anyways... One of the advantages is having your cake and eating too - you just have to pick a cake. So, for instance, you can build a header w/a smaller primary tube than your existing header allowing you to keep the same horsepower, while picking up some bottom end torque as well! Of course it all depends on your goals(which cake?). Every header makes its peak at a specific r.p.m. point. You'll have chosen ahead of time what that is. That still leaves a LOT unsaid. I'm not trying to write a book here. David Vizard (and he's on RU-vid now) has an excellent book on making h.p. And it covers some stuff on stepped headers.
We really don't recommend any sort of inserts or anything like that. In theory, they might provide some additional backpressure but in practice, they never seem to make any difference and they are prone to breaking or cracking, leading to rattling in the mufflers.
The Y pipe does a good job of exhaust scavenging, but it doesn’t equalize the backpressure as well as the H pipe, which is much more important on M8’s.
