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OK, I finally found something similar to what I was trying to describe. This Lamborghini is adapted to fit in a marine application, I also found this concept in a lot of marine engine applications but they were all cast aluminum block manifolds.
But note how all the smaller cylinder port stubs run into the side of a much larger log tube? Also note how these stubs are attached and aimed to create a swirl effect inside the larger tube.
The same concept can be used to fabricate something just like it but with the stubs being directed down and into the backside of the larger tube so that it is lower along side the engine. And your turbo collector flange can be attached anywhere it fits best to the side of the larger tube. And if you need a waste gate bypass it can be added also.
This is very similar to how the first aircraft turbo manifolds were made. Simple yet very efficient because they all come out into a much larger tube rather than all being bottle necked into a small tube going towards the outlet. Basically a "plenum" chamber but for the exhaust.
Here were my thoughts when I first saw this concept and design...
Being a larger Plenum Chamber all the the port outlets are going to encounter the same equal pressure and resistance, ie "tuned". And because it is a pressure equalizing chamber the outlet can be located anywhere to the chamber and make no difference in overall efficiency because of where it is located. And because of how the smaller tubes are aimed it creates an advantageous swirling effect that helps reduce port flow from affecting the flow of any of the other ports.
Anyways just wanted to toss the concept at you in case you might find something useful from it for your design.
The only difference would be rather than all those stubs running into the same diameter tube they would run into a larger diameter collector tube creating a plenum expansion chamber on it's way to the turbo outlet. Like let's say 3 - 3 1/2 inch. The advantage I think with this would be equal back pressure resistance on all the ports and a smoother freer flow.
Just like how an intake plenum chamber creates equal vacuum pull to all the intake ports no matter how far they are away from the source. An equalizing chamber of sorts to help reduce the draw difference between longer tubes and shorter tubes. Does that make sense?
Taking all those stubs and running them into a same sized tube like that one has got to be bottlenecking the system at high RPM flow and reducing the overall potential of the system. Compact and bottlenecked or compact and not bottlenecked would be the only real difference.
And assembly wise, it would eliminate the need for all the T joints and elbows in that. Those stubs could all just be welded into holes in the side of the larger diameter tube.
BugOut4x4. Are u talking about Boostwerks' design?
I could not find an image of the Boostwerks manifold Neal. But I did run across a couple that help to visualize the concept. The turbo flange can be mounted anywhere on the larger tube without any change in efficiency.
If only we had a cross flow head. Packaging is the major issue.
I did a lot of homework on this a couple years back because I was going to do this. I kind of like that they are on the same side and there is lots of room down there. But after doing a lot of measuring the need for a compact log manifold like I am describing became apparent to package it much easier and locate it better. The cool thing is, once you figure out the perfect location for the hot side off the exhaust and aimed best for that, the cold side housing can be re-clocked to wherever you need it to be aimed for the piping on that side.
I can't count how many times I have had to re-clock "direct fit replacement" turbo housings. lol
So hows it going? Been able to work on this? I recapped what you mentioned about "packaging" and realized you may have been indicating you are going to try utilizing an intercooler? You are right... A flow through head would be much easier for this.
I have it clamped and mocked to the bench. Once I get a down pipe made to clear the control arm I'll be ready to put it in. I may end up selling some of the extra ones.
I have it clamped and mocked to the bench. Once I get a down pipe made to clear the control arm I'll be ready to put it in. I may end up selling some of the extra ones.
Right on! Can't wait to see it! Good to hear you are getting it done!
07-04-2018, 11:48 AM
