just wondering, if anyone has tried a step-header design for their turbo manifold. like stepping down from 1 1/2 or whatever to 1 3/8. anyways, i just through those numbers out there, but you get the idea. using a bigger diamter right out of the head for like the first bend, then stepping down to like an 1/8 smaller diameter for the rest of the manifold. dont be harsh, just something i was wondering if people were doing or have tried.

 

I'd like to know, too.

 

In for some answers.... :]

 

the way the b16 head is, its so wide down in the port, compared to the exit of the port. its sort of like a double barrel shotgun appreance in a way if you wanna look at it that way.




Modified by redboost10 at 12:51 PM 12/24/2006

 

With a turbo manifold, I'd almost expect you to want the reverse, larger runners after the first bend. Its one method to curb reversion. The larger->smaller method would mostly increase veolocity & backpressure and decrease flow. On turbo manifolds less runner volume doesn't really affect spool time much, not to the extent people think.

 

i started thinking about this, and i think on the intake you would like tapered towards the head, but on the exhaust, like mentioned above, if anything you wanna step the diameter up. i think the intake is a lot more important than the exhaust. the exhaust, the only goal is to get that **** outta there as quick as possible. of course, equal length will be put into consideration. my intake will be tapered, and have circle to oval runners with v-stacks in the plenum. the plenum will also be tapered.