4-3-1 Manifold?
#1
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So the miata engine fires 3rd 4th then 2nd then 1st then 3rd then 4th....
Why not combine the 2nd and 3rd cylinder together while making a tube manifold? 1st and 4th are too far apart however the 2nd and 3rd should make the final connection at the collector simpler.
Discuss?
Imagine the 2nd and 3rd cylinder combining into 1 at the top and then going to the collector as one pipe.
Why not combine the 2nd and 3rd cylinder together while making a tube manifold? 1st and 4th are too far apart however the 2nd and 3rd should make the final connection at the collector simpler.
Discuss?
Imagine the 2nd and 3rd cylinder combining into 1 at the top and then going to the collector as one pipe.
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/69654-4-3-1-manifold-evo_turbo_manifold.jpg?dateline=1362904288)
Last edited by triple88a; 03-10-2013 at 04:38 AM.
#5
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The Begi s6 (one in picture) is a most clever manifold imo. It offers similar turbo placement to the s4 manifold which means ac/ps compatibility but it has updated runner size and thickness which means it should be durable.
A bonus is that it is compact and relatively straight forward to make due to the merged 2 and 3 runners.
It would be even better if the head manifold flange were reversible as then it could be used for top mounts also. It imagine a reversed s6 would be a good match for a long body turbo.
A bonus is that it is compact and relatively straight forward to make due to the merged 2 and 3 runners.
It would be even better if the head manifold flange were reversible as then it could be used for top mounts also. It imagine a reversed s6 would be a good match for a long body turbo.
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#16
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Disadvantages I found with low mount
-compressor housing usually clashes with the cooling water hose and hose needs to be rerouted. (Not an issue with coolant reroute.)
-compressor inlet ends up at the back of the power steering pump and the air inlet piping and filter placement is usually a struggle. (Not an issue with no PS.)
-the turbo is buried and difficult to inspect/work on if needed.
Disadvantage of top mount
- a longer and potentially more difficult and restrictive downpipe.
- more visible turbo install
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