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Old 12-03-2020, 02:46 PM   #1
dalek
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Default Divided turbo manifold 1-2 vs 1-3

What is the difference when building a divided manifold between tying cylinders 1-2 and 1-3?
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Old 12-03-2020, 02:56 PM   #2
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It's even pulse pairing vs. two in a row and then a long pause.
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Old 12-03-2020, 03:59 PM   #3
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Correct me if I am wrong but 1 and 4 ride together just like 2 and 3. i.e. when 1 is going up to the top, so is 4, but 2 and 3 are racing to the bottom.



So is the choice then determined by the head (valves)?

Last edited by dalek; 12-03-2020 at 04:31 PM..
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Old 12-03-2020, 04:34 PM   #4
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Derp, I didn't look at your question closely enough. If you're not pairing it with #4, then it really doesn't mater if you choose 2 or 3.

Proper pairing (an exhaust pulse every 360 degrees) would tie together 1 and 4, 2 and 3.

Improper pairing 1 and 2 or 3, 4 and 2 or 3 - would result in 2 pulses separated by 180 degrees, then 540 degrees of nothing.

Either one would probably work, it might be hard to casually tell the difference just driving it around. Not sure. Is this for NA or a divided scroll turbo manifold?

Last edited by JohnMc; 12-03-2020 at 04:53 PM..
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Old 12-04-2020, 09:35 PM   #5
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Quote:
Originally Posted by JohnMc View Post
Derp, I didn't look at your question closely enough. If you're not pairing it with #4, then it really doesn't mater if you choose 2 or 3.

Proper pairing (an exhaust pulse every 360 degrees) would tie together 1 and 4, 2 and 3.

Improper pairing 1 and 2 or 3, 4 and 2 or 3 - would result in 2 pulses separated by 180 degrees, then 540 degrees of nothing.

Either one would probably work, it might be hard to casually tell the difference just driving it around. Not sure. Is this for NA or a divided scroll turbo manifold?
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Old 12-03-2020, 05:14 PM   #6
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In my specific case is turbo but it would be nice to know is there is a difference
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Old 12-04-2020, 09:35 PM   #7
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maybe look at the firing order.
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Old 12-04-2020, 09:57 PM   #8
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Either way it will sound like a subaru...and probably work well enough. Not ideal, but definitely not the end of the world. If anything, the shorter the runner the better.
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