Old article by David Vizard on Do-It-Youself porting - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Old article by David Vizard on Do-It-Youself porting by saurkraut on 19 Aug, 2008 14:59
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• #1 by Possum79 on 23 Aug, 2008 21:28
• http://www.poscarclub.com/vw_stuff/Port_Polish_Article.pdf
  
  I turned it into a pdf because I didn't want to keep multiple picture around and end up loosing them.
• #2 by rallydiesel on 05 May, 2011 18:46
• This should be stickied.
• #3 by Pat Dolan on 06 May, 2011 23:16
• That is a REALLY good article - and pretty much bang on with "standard practice" for many years since on pre-TDI 8 valve engines.  BTW: if you haven't ported an IDI - you haven't lived!  Freeing up the airflow (including exhaust) makes some fantastic power AND economy.
• #4 by RabbitJockey on 07 May, 2011 14:45
• Quote from: Pat Dolan on 06 May, 2011 23:16

  BTW: if you haven't ported an IDI - you haven't lived!
  

  
  
• #5 by Vangruver on 07 May, 2011 14:55
• Quote from: Pat Dolan on 06 May, 2011 23:16

  That is a REALLY good article - and pretty much bang on with "standard practice" for many years since on pre-TDI 8 valve engines.  BTW: if you haven't ported an IDI - you haven't lived!  Freeing up the airflow (including exhaust) makes some fantastic power AND economy.
  

  
  I'd love to spend more time on something like this.
  
  I've learned for years and years how to blueprint and port 2 stroke engines [motorcycles/jetskis/even garden trimmers ]to increase efficiency and double the power output, but when it comes to 4 stroke engines, I'm clueless.
  
  I'd love to have a benchmark freshly rebuilt properly broken in engine to compare towards a ported diesel engine.
  
  
• #6 by FJ40Jim on 22 Jul, 2011 09:45
• Thanks for posting this article.  I was looking for it to reference for our LeMons rebuild, but couldn't remember where I'd seen it.  Googling for "Vizard article VW engine" brought it right up. 
• #7 by hillfolk'r on 24 Feb, 2013 23:02
• I know my dad saved an article he did on how to make your own flow bench. Yea all ya need is about 16 vacuum motors if i remember right haha. No seriously that was a good article. Im sure that one is probably online too it had to be late 80s for sure though
• #8 by Blocksmith on 05 Jul, 2013 19:29
• Here's an archive of old VW Motorsports articles I found when trying to find where to stitch weld the chassis, thought others might be interested as well:    http://www.vwmotorsport.info/vwmedia/vwmedia.asp
• #9 by GEE-BEE on 13 Jul, 2014 12:41
• http://extrudehoneafm.com/automotive.html
  
  I just got back my PD150, perfect like a mirror
  
  I sent them a new ahu head assy and a AAZ  intake for a driver build
  
  GB
• #10 by scubagli on 14 Jul, 2014 22:22
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  Quote from: GEE-BEE on 13 Jul, 2014 12:41

  http://extrudehoneafm.com/automotive.html
  
  I just got back my PD150, perfect like a mirror
  
  I sent them a new ahu head assy and a AAZ  intake for a driver build
  
  GB
  

  Mind sharing the cost of doing a cylinder head?
  
  
  
• #11 by jlpst94 on 22 Jan, 2015 08:59
• I got a quote of 300 to refresh the head and 400 for a port and polish.  A shop near me has the flow bench and setup to do 8Valve VW engines.   I can't wait, I've heard good things about doing this! 
• #12 by rallye_golf on 08 Apr, 2018 18:54
• It appears that the link to the article no longer works?
  Shame as it was a good read! Did a bit of googling, but can't find it anywhere on the net.
• #13 by RustyCaddy on 08 Apr, 2018 22:24
• This looks to be the article, about 1/2 way down the page:
  
  http://forums.vwvortex.com/showthread.php?4628897-Porting-the-8v-head