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green car
Fordmods - Getting Side Ways
Age:31
Posts: 463
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Location: perth WA, Australia
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 Posted: Wed Jun 11, 2008 12:07 am Post subject: Extrude hone porting? |
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| Haha i hope i got the name right.I heard of this type of porting in an old mag,performance buildups or something similar.Pretty sure it was called extrude hone porting and they used an abrasive media like grey snot which they forced through the ports in the heads -manifolds and it was like it had been hand ported after the process was done.Anyone ever had this type of porting done or heard of it being used? |
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gogetta
Fordmods - Getting Side Ways
Posts: 2518
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Location: melbourne, sunshine VIC, Australia
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| Posted: Wed Jun 11, 2008 12:10 am Post subject: |
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| i beleive its very expensive and basically limited to big dollar rebuilds |
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BOTTLEDUP
Fordmods - Getting Side Ways
Age:29
Posts: 475
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Location: Perth SoR WA, Australia
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| Posted: Wed Jun 11, 2008 11:38 am Post subject: |
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Its very popular in the US, however I don't believe there is anyone in Australia currently offering it. There was a guy in South Oz who did a similar thing called abrasive porting, I think he used compressed air and a media similar to sand blasting garnet to get a similar result. However his pricing was more than CNC work can be done for now.
The big advantage of extrude honing/abrasive porting is it can do complex curves such as dual plane intakes or Ford 5.0L upper manifolds without having to cut them up. |
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chrisredden
Fordmods Stock as a Rock
Age:34
Posts: 126
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Location: mundulla SA, Australia
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| Posted: Wed Jun 11, 2008 3:04 pm Post subject: |
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| Wimmera machine shop in Horsham Vic know were to get it done. Im getting the lower part of explorer manifold done when getting motor stroked. $400 to do lower manifold, pretty pricey thou. will ask them were they get it done. |
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green car
Fordmods - Getting Side Ways
Age:31
Posts: 463
Joined: 27 Sep 2007
Location: perth WA, Australia
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| Posted: Wed Jun 11, 2008 3:36 pm Post subject: |
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Thanks for the replies.  |
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green car
Fordmods - Getting Side Ways
Age:31
Posts: 463
Joined: 27 Sep 2007
Location: perth WA, Australia
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| Posted: Thu Jun 12, 2008 1:17 pm Post subject: |
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| Well that says it all i think.Certainly an interesting read. |
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chrisredden
Fordmods Stock as a Rock
Age:34
Posts: 126
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| Posted: Thu Jun 12, 2008 4:12 pm Post subject: |
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Very good link on subject ebxr8380. Gunna can the extrude honing job on lower manifold and have a go at a port job myself.  |
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xr8ute
Fordmods - Getting Side Ways
Age:28
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| Posted: Mon Jun 16, 2008 11:24 am Post subject: |
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The downside to extrude hone porting is that you cant really control what the final shape is.
There is a good example of this on Tom Moss' website. The Explorer/Cobra/GT40 style lower intakes need more material taken from the 'roof' of each runner, but the extrude honing biased the flow and therfore the material removal to the bottom of the port.
A combination of hand porting to get the port/runner shape, and then finishing off with extrude honing would probably be good. But maybe overkill.....i dont imagine it would be good bang for buck.
For an all-out stock-appearing type build it would be the s**t |
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chooka
Fordmods - Smokin em up
Age:37
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Location: Northern NSW, Australia
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| Posted: Thu Jun 19, 2008 10:42 pm Post subject: |
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I went with the Tom Moss option with the cobra manifold when fitting the new AFR heads.Cost about $400 with labour and postage.Excellent bloke to get on with.
Runner gain over stock (cfm):
1-64
2-58
3-52
4-55
5-63
6-46
7-50
8-44
Average runner flow of 268 cfm |
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