porting standard headers
#1
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porting standard headers
has anyone had a go at porting standard headers and up pipe i know harvey does it but was thinking of having a go my self
any advice guys
any advice guys
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Cleaning up the manifold ports will definately help to aid gas flow, start with a grinding stone on a dremel and remove any rough edges and mildy increase the port diameters. But not too much and definately not as far as the gasket inner ring as this will decrease gas velocity and negatively effect turbo spool up. The surface finish can then be finished of with a fine sand paper by hand or a dremel and lastly a rubber wheel attachment. A polished finished isn't essential as the surface will quickly be covered in carbon deposits.
Last edited by bluerigster; 27 August 2009 at 01:51 AM.
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Do you port headers by taking piece of paper an pencil an stenciling the exhaust ports on the engine onto the paper then use the stencil as a guide to how much you should grind off the headers?
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The best way to do them is to take the throats back to the soot ring, thus removing any steps down it the direction of flow.
Look at the image below, on the top set (untouched) you can clearly see the soot ring, which is the same as the gasket size:
Work in progress:
Cross over pipe is a little trickier as it's steel, but you can still improve things, from this:
To this:
Finally finished, wrapped ready for a coat of VHT paint to help seal the wrapping :
Hope this helps..
PS try and cut off the no longer required lugs that the OE heat shields bolted to.
PPS Be prepared for a lot of sooty crap from all the grinding..
Look at the image below, on the top set (untouched) you can clearly see the soot ring, which is the same as the gasket size:
Work in progress:
Cross over pipe is a little trickier as it's steel, but you can still improve things, from this:
To this:
Finally finished, wrapped ready for a coat of VHT paint to help seal the wrapping :
Hope this helps..
PS try and cut off the no longer required lugs that the OE heat shields bolted to.
PPS Be prepared for a lot of sooty crap from all the grinding..
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#10
You can do a bit better than that if you have access to a welder. Cut off the "spare" pipe, fill the gap to the flange with weld, and then grind it back to match the mating port.
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Ideally if I had a welder/welding skills when I did this that would have been the thing to do, but in the end I did make it a little better than the picture suggests, which was a lot better than it was..
Lol, I thought about using some filler, then I had visions of my turbine blades being trashed when I came loose..
The one thing that hasn't been done and I wish it had, is the up-pipe. I recon there's spooling gains to be had here, although this is a s/s decatted up-pipe, so the restriction might not be so bad as oe headers..?
Lol, I thought about using some filler, then I had visions of my turbine blades being trashed when I came loose..
The one thing that hasn't been done and I wish it had, is the up-pipe. I recon there's spooling gains to be had here, although this is a s/s decatted up-pipe, so the restriction might not be so bad as oe headers..?
#12
The one thing that hasn't been done and I wish it had, is the up-pipe. I recon there's spooling gains to be had here,
although this is a s/s decatted up-pipe, so the restriction might not be so bad as oe headers..?
#14
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if i port the standard up pipe what do i do with the standard steel insert that is in the end that the turbo bolts on to ,its about 2inch down the pipe and is smaller bore i take it i just leave this as it is .
any one got pics of a ported up pipe
thanks
any one got pics of a ported up pipe
thanks
#15
Short of doing the weld in/grind back process on the mouth of the standard up-pipe, there isn't much you can really do short of flattening the interior of the tubes where the flange welding has made them bulge.
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