Single Turbo RX-7's Questions about all aspects of single turbo setups.

Anyone measure the difference In length within the Primaries... (pics)

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Old Feb 8, 2004 | 12:44 AM
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Anyone measure the difference In length within the Primaries... (pics)

...of sschromes Divided Manifold? I'm curious to know how much bigger the front runner Is as compared to the rear one.

Also, as for the secondary runners. Are they of equal length?


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Old Feb 8, 2004 | 12:49 AM
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From: Toronto, Corporate Canada
Also, If anyone tells me to search - I'm going to have to bring out the shot gun. I have searched. If you can post a link that specifies that this has been posted before and answered, than I'll send you $5 via paypal. Just fill Info here. x__________

Last edited by silverrotor; Feb 8, 2004 at 01:08 AM.
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Old Feb 9, 2004 | 12:11 AM
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Who makes that manifold?

STEPHEN
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Old Feb 9, 2004 | 12:37 AM
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that looks like the OBX manifold... heard BAD things about them...
-Keith
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Old Feb 9, 2004 | 10:25 AM
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Originally posted by Sl0w7
that looks like the OBX manifold... heard BAD things about them...
-Keith
Thats probably why no one Is responding to my question.
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Old Feb 9, 2004 | 10:49 AM
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From: Scott AFB, IL
Originally posted by Sl0w7
that looks like the OBX manifold... heard BAD things about them...
-Keith
It's the same design. NOT the same manufacturer. I have a SSAUTOCHROME manifold and the quality is superior to the OBX (aside for a SLIGHT) fitment issue.. My .96 hotside barely tapped the UIM, so I had the flange cut off, and re-welded at an angle. No problems.. The wastegate flange is for a HKS 50mm wastegate... So if you plan on using a smaller gate, you'll have to weld on top of the other flange (No biggie)

Tha manifold is not equal length.. Close, but not. I can see if I can measure it when I get home as I have another one..
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Old Feb 9, 2004 | 12:06 PM
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I have the OBX one at home -- when I get home (if no-one has responded), I'll get some measurements.
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Old Feb 9, 2004 | 09:10 PM
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Okay, it's practically impossible to measure these runners w/ any kind of accuracy, but here goes...

If I measure one outside wall, they appear to be as much as 2" difference -- like 8.5" vs. 10.5" +/- .5".
I attempted to measure inside the actual runner and ended up being a lot closer -- like 8.5" vs 9.5". Part of that problem is that the shorter runner appears to be slightly larger in the middle, so the volume might be a little bigger. But at the very least, if I just measure the shortest distance from each point, it ends up being 7" vs. 9". I know this is hard to interpret, but I think no matter how you measure it, you're looking at about a 2" difference in runner lengths between the short and long -- the long runner length being somewhere in the 9.5"-10" range.

hope that helps more than it confuses... I didn't measure the runner length to the WG flange, so if you want that, let me know.
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Old Feb 9, 2004 | 09:39 PM
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Thanks for the measurements and the explanation guys.

Trav, can you measure the secondaries for me? That'll be great If you can.
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Old Feb 10, 2004 | 08:34 PM
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Okay on the WG runners, the long one appears to be about 15" - 15.5" and the shorter one is 12" - 12.5".

Just so we're clear, my measurements for primary runners were from outside edge of exhaust port flange to outside edge of turbo flange. The shorter runner is the front, and the longer runner is the rear.
Measurements on the WG runners were from outside edge of WG flange to end of runner where it terminated at the primary runner. The longer WG runner is attached to the front (short) primary, and the shorter WG runner is attached to the rear (long) primary.
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