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displaying posts 1 to 9 of 9
| Author | Subject: Inlet Manifold Design |
 sam1
Junior User  Location: Coventry Registered: 11 Dec 2011 Posts: 51 Status: Offline |
Post #1
Has anyone ever tried cutting down the trumpets inside the inlet manifold so they are flush with the plenum wall?I'm currently doing my first xu10j4rs rebuild and was surprised by the manifold design. I imagine it is designed to improve mid range and bottom end performance??? but it would be interesting to see how much top end power would be gained by making it less restrictive. |
 Posted 3rd Feb 2012 at 18:37
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #2
None, and you'll loose a big chunk of midrange too.________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 3rd Feb 2012 at 18:41
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clen666
Seasoned Pro  Location: Co. Durham Registered: 12 Feb 2009 Posts: 2,401 Status: Offline |
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Posted 3rd Feb 2012 at 18:43
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sam1
Junior User Location: Coventry Registered: 11 Dec 2011 Posts: 51 Status: Offline |
Post #4
ok, thanksclen666 wrote: reading through this now. I did a search but did not come across that thread |
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Posted 3rd Feb 2012 at 18:52
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lewisdmz
Senior User Location: plymouth Registered: 25 Jul 2009 Posts: 504 Status: Offline |
Post #5
I thought trumpets are vital for "getting air through stuff". |
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Posted 3rd Feb 2012 at 19:04
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sam1
Junior User Location: Coventry Registered: 11 Dec 2011 Posts: 51 Status: Offline |
Post #6
They are important, but are they occupying more than 50% of the space (edit: cross section area) in the plenum. From reading the wonderfully detailed thread above it seems that this mod has not so far been proven to work on a standard engine... |
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Posted 3rd Feb 2012 at 19:47
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #7
Because the airflow near the wall of a plenum is dire, and you've also got less area for the edge of the trumpets to draw from, so higher acceleration of the airflow and lower dynamic pressure at the intakes, which interferes with the resonance. Might work if you could lengthen the whole system first but it would still only come into its own at high rpms________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 3rd Feb 2012 at 20:37
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sam1
Junior User Location: Coventry Registered: 11 Dec 2011 Posts: 51 Status: Offline |
Post #8
makes sense. looks like improving the design would require significant R&D input then, trial and error, CAD, flow bench... |
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Posted 3rd Feb 2012 at 21:57
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #9
yup!just fit throttle bodies  (with a decent manifold, not the off the shelf jenvey/maniflow/omex one either)________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 3rd Feb 2012 at 22:01
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