porting exhaust manifold
03 February 2003, 08:49 AM
#1
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Ive heard people mention porting the standard manifold rather than buying an after market hks etc for similar results. Any companies that do this and what sort of gains have people seen from it.
Also are there any inlet manifold mods appart from front entry conversions.
Also are there any inlet manifold mods appart from front entry conversions.
03 February 2003, 04:23 PM
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Its bolt on.. replace all gaskets.. Not a hard job..
Spool Up should be improved..
Inlet manifold?? Not really..
Spool Up should be improved..
Inlet manifold?? Not really..
03 February 2003, 04:36 PM
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dunno... havent tested it..
prove the tubular ones give you a worthwhile gain
prove the tubular ones give you a worthwhile gain
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03 February 2003, 04:54 PM
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lol @ telboy...
Porting basically means grinding away restricions, be they in the cyl head, inlet or exhaust manifolds,
when u remove the standard manifold u will see 'soot' marks where the exhaust is 'hitting' the manifold on its way out... by grinding the metal back a little and smoothing the exit u can improve flow... and hopefully improve spool up
Cheers
Porting basically means grinding away restricions, be they in the cyl head, inlet or exhaust manifolds,
when u remove the standard manifold u will see 'soot' marks where the exhaust is 'hitting' the manifold on its way out... by grinding the metal back a little and smoothing the exit u can improve flow... and hopefully improve spool up
Cheers
04 February 2003, 12:21 PM
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and look at my torque..
Richard Im serious..
Can someone prove that threre are a set of headers that are good with every turbo...
Im seriously considering putting the turbo above the gearbox then having two up-pipes joining under the turbo..
David
Richard Im serious..
Can someone prove that threre are a set of headers that are good with every turbo...
Im seriously considering putting the turbo above the gearbox then having two up-pipes joining under the turbo..
David
04 February 2003, 01:08 PM
#16
I'm not convinced that the manifold is smaller than the head ports. The soot that people see is where the gasket space is. The gasket is bigger than the head and manifold and will leave a gap where the soot gathers thus giving an impression that the manifold is smaller.
IMHO the gain from porting is not in less restriction in the manifold but in stopping reverse back-flow into the head and therefore not diluting the next intake charge.
There is little to be gained in doing the joints either, measure the diameters and you'll see what I mean. The up pipe is not as bad as some make out, it's basically a tube within the bellows and the only problem is the small lip - but this matches to the collector anyway.
It has improved some cars in torque - where you want it really.
F
IMHO the gain from porting is not in less restriction in the manifold but in stopping reverse back-flow into the head and therefore not diluting the next intake charge.
There is little to be gained in doing the joints either, measure the diameters and you'll see what I mean. The up pipe is not as bad as some make out, it's basically a tube within the bellows and the only problem is the small lip - but this matches to the collector anyway.
It has improved some cars in torque - where you want it really.
F
04 February 2003, 02:12 PM
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I haven't found a design of aftermarket header yet which didn't improve some area's while screwing other area's up. Just depends where the screwed up area is - for me, 200rpm higher spool point is well worth the gains above 4k 
For sure, without a remap forget it - especially when porting the stock headers gives good results anyway. I just felt your statement was a little, uh, 'sweeping'
Richard
For sure, without a remap forget it - especially when porting the stock headers gives good results anyway. I just felt your statement was a little, uh, 'sweeping'
Richard
04 February 2003, 02:30 PM
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I ported mine by holding a gasket against the flange and then spray painted the gasket so I had something other than a soot line to aim for then smooth out all restrictions with a tct cutter in a die grinder. a few hours work..
04 February 2003, 09:57 PM
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If you could Bob that would be great. Sounds more fun than buying a set
Would try and get them done and fitted for the 1st, if it's safe to fit them before the remap?
Cheers
Nathan..
Would try and get them done and fitted for the 1st, if it's safe to fit them before the remap?
Cheers
Nathan..
05 February 2003, 05:34 PM
#28
Bob, BTW I cannot get through to your website, email + phone
Can you mail me a different email address I can send BRD questions too as the one in your profile bounces back.
Nezz.
Can you mail me a different email address I can send BRD questions too as the one in your profile bounces back.
Nezz.