Duramax Diesels Forum Truck of the Week
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Old 09-11-2019, 04:31 AM
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Default Manifold vs headers

https://www.dragzine.com/tech-storie...-race-headers/

I came across this today...anyone think we could gain alot more power if we could do the same? Just thinking out loud.
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Old 09-11-2019, 05:39 AM
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I believe on sustained, high rpm applications that tubular headers will yield power gains. Iíve not seen any documented power gains between manifolds vs headers on DMax engine.
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Old 09-11-2019, 08:49 AM
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Quote:
Originally Posted by jpowel29 View Post
I believe on sustained, high rpm applications that tubular headers will yield power gains. Iíve not seen any documented power gains between manifolds vs headers on DMax engine.
Has anyone tried to make a longer set of equal length headers? Or would we even have room to fit them? All I see is the log type headers manifolds. I read the article and what caught my eye was the drive pressure difference
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09 lmm ccsb ltz, moonshine, mpi s480 over 68mm vgt, sdp y bridge, BigDipper trans, 60 overs, 10mm pump, ppe up pipes and manifold, banks intercooler & exhaust, airdog165 w/sump, isspro guages, traction bars, the list goes on...Big thanks to BigDipper!
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Old 09-11-2019, 09:08 AM
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Moved to Hard Parts.
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Old 09-11-2019, 11:20 AM
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We tried "spaghetti" headers a long time ago. Everyone that tried both them and the log headers gave us mixed feedback.
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Old 09-11-2019, 11:57 AM
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Very enjoyable read thanks for sharing. I’ve always wondered why even “headers” for these trucks were still a manifold style.

Rick, those are sexy and I want them let me go rob a bank.
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Old 09-11-2019, 01:08 PM
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Randy Overton has custom tubular headers. His class allows multiple turbos but I think he runs one large (4.5" to 5") turbo. I am not sure who made them nor if they were dyno tested.
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Old 09-11-2019, 01:52 PM
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Old 09-11-2019, 01:59 PM
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Quote:
Originally Posted by ikeG View Post
Randy Overton has custom tubular headers. His class allows multiple turbos but I think he runs one large (4.5" to 5") turbo. I am not sure who made them nor if they were dyno tested.
https://www.facebook.com/18827924186...9392/?sfnsn=mo

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sounds like he did an 8 into 1 (the right way, not the bs way i see guys call it). now THAT makes a significant difference when you line up the cylinder pulses in order.
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Old 09-11-2019, 02:00 PM
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Quote:
Originally Posted by RickDLance View Post
We tried "spaghetti" headers a long time ago. Everyone that tried both them and the log headers gave us mixed feedback.
I own one of the first sets. They've been in multiple trucks and seen a lot of heat. No warping or cracking, and the coating is still perfect. As far as performance, I never got to try them back to back with a quality set of "log" manifolds, but I'm certainly willing to if I can get a set to test cheap enough.
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Last edited by juddski88; 09-11-2019 at 02:18 PM. Reason: Added photos
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Old 09-11-2019, 02:10 PM
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Quote:
Originally Posted by Chevy1925 View Post
sounds like he did an 8 into 1 (the right way, not the bs way i see guys call it). now THAT makes a significant difference when you line up the cylinder pulses in order.
Here are some pictures of them.
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Old 09-11-2019, 02:18 PM
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Quote:
Originally Posted by juddski88 View Post
Here are some pictures of them.
so not a true 8 into 1 then. shes pushing some rpm then!
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Old 09-11-2019, 02:22 PM
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Quote:
Originally Posted by Chevy1925 View Post
so not a true 8 into 1 then. shes pushing some rpm then!
Over 6000rpm
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Old 09-11-2019, 03:41 PM
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If you could even Dyno against a set of regular manifolds. Just looking to see if there is a drive pressure difference and power difference like on the LS motor.
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Old 09-11-2019, 04:00 PM
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Undoubtedly a drive pressure difference, but because there are so many variations of long tube headers - different tube volumes, shapes of collectors, flow characteristics, etc. It's hard to rule out much of anything. If you had 3 or 4 designs of headers to compare with 3 or 4 designs of log manifolds, then you could form a generalized opinion of either one
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