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Porting Question 

 

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 Post subject: Porting Question
Posted: Sat Nov 17, 2007 12:23 pm 
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I am doing some porting work on my VCT head and need to know how much material can be taken out of the exhaust port. If I look down the port I can see a flat section on the floor where is enters the bowl, the port does not line up with the bowl and turns a sharp corner, can I remove a bit out of here?

 

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Posted: Sat Nov 17, 2007 12:32 pm 
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leave the flat floor there. you'll hurt the port by rounding it out

 

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Posted: Sat Nov 17, 2007 1:45 pm 
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tickford_6 wrote:
leave the flat floor there. you'll hurt the port by rounding it out



Like what he said ^^^^^^, don't touch the floors, can be smoothed, but take none off.

 

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Posted: Sat Nov 17, 2007 2:07 pm 
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Not the floor but the sharp(ish) turn the port takes to line up with the bowl.

 

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Posted: Sat Nov 17, 2007 2:17 pm 
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twason wrote:
Not the floor but the sharp(ish) turn the port takes to line up with the bowl.


Do you mean a casting line/ridge??? Where the sections of the mould join together.

 

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Posted: Sat Nov 17, 2007 2:23 pm 
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No, the 3 o'clock part of the port where it enters the bowl and adjacent the guide is where I am talking about.

 

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Posted: Sat Nov 17, 2007 2:53 pm 
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http://www.autospeed.com/cms/A_109232/article.html

 

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Posted: Sat Nov 17, 2007 2:55 pm 
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twason wrote:
No, the 3 o'clock part of the port where it enters the bowl and adjacent the guide is where I am talking about.


Can you post a photo???

 

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Posted: Sat Nov 17, 2007 4:08 pm 
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TURBO_GHIA wrote:
http://www.autospeed.com/cms/A_109232/article.html
Yes that has been my reference document so far.

 

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Posted: Wed Nov 21, 2007 10:36 pm 
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After an extended search I have found the USB cable.
Here is the area I am taking about circled in red.

 

 

Attachments:
File comment: Area circled in red
Exhaust.JPG
Exhaust.JPG [ 45.54 KiB | Viewed 66 times ]

 

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Posted: Thu Nov 22, 2007 7:24 am 
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Are all the ports like that or just the one?
Use a inside calibre to measure the circumference of the throat entry into the bowl. which ever is the largest you use that as your target for the rest.

personally I'll just give it a clean without going to far. you don't want to hinder gas velocity to much.

 

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Posted: Thu Nov 22, 2007 7:39 am 
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Thanks Slick good point, they are all like that. It was not so much the guide to wall volume that concerned me but the sharp bend. I am probably not going to do anything there now as I am nervous about the water gallery.

Next question, is this area a hangover from the swirl ridge on an EA or is it purposefull on an AU?

 

 

Attachments:
File comment: Chamber
swirl.JPG
swirl.JPG [ 53.51 KiB | Viewed 67 times ]

 

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Posted: Thu Nov 22, 2007 8:30 pm 
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twason wrote:
Thanks Slick good point, they are all like that. It was not so much the guide to wall volume that concerned me but the sharp bend. I am probably not going to do anything there now as I am nervous about the water gallery.

Next question, is this area a hangover from the swirl ridge on an EA or is it purposefull on an AU?


What is that head off???? Is it an AU????
This pic is of an EF head, a 94 AB. The pics are before and after polishing, as you can see, there was no little ridge. I haven't done many AU head gaskets, so I haven't seen this before.

 

 

Attachments:
My 4.0 EF cyl head 009.jpg
My 4.0 EF cyl head 009.jpg [ 301.35 KiB | Viewed 79 times ]
My 4.0 EF cyl head 020.jpg
My 4.0 EF cyl head 020.jpg [ 367.6 KiB | Viewed 62 times ]

 

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Posted: Thu Nov 22, 2007 9:34 pm 
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Its an AU VCT head.

 

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Posted: Thu Nov 22, 2007 9:45 pm 
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twason wrote:
Its an AU VCT head.


There ya go.....I have never done one of those. I have had to replace the VCT units on the front of the heads, because they had porous castings and leaked oil.

 

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