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myolbug Samba Member
Joined: April 09, 2004 Posts: 776 Location: 3 feet behind my head!
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Posted: Sun Mar 27, 2005 10:34 pm Post subject: DIY head porting |
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I haven't yet read the book about head porting the VW head, but this article makes a lot of sense. I am a complete noob when it comes to head porting, but I think that there is good info in this.
http://www.sa-motorsports.com/diyport.shtm _________________ "To my mind it is wholly irresponsible to go into the world incapable of preventing violence, injury, crime, and death. How feeble is the mindset to accept defenselessness. How unnatural. How cheap. How cowardly. How pathetic." Ted Nugent
candyman wrote: |
i broke my brain over ten years ago and its still dumb |
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Kaferfiend Samba Member
Joined: August 15, 2004 Posts: 439 Location: Selah WA
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Posted: Sun Mar 27, 2005 10:44 pm Post subject: Re: DIY head porting |
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myolbug wrote: |
I haven't yet read the book about head porting the VW head, but this article makes a lot of sense. I am a complete noob when it comes to head porting, but I think that there is good info in this.
http://www.sa-motorsports.com/diyport.shtm |
Great head porting comes from many years of experience. The best guys out there have all the tools, including flow benches.
Many times, guys that port their own heads find that they actually lost performance mainly due to the lack of velocity thru the port. This causes the power to fall off sharp off idle, and depending upon cam, valve config, and carb setup you either get mad top end, or it never quite gets the chance to do it's job.
That being said, there are a LOT of VW heads out there to practice on, and no one ever said you can't learn anything new. The porting I've done is simple but effective. Smooth out the rough areas on both sides, polish the exhaust and leave the intake a satin finish. Match the manifolds, and go driving. This doesn't disrupt the velocity thru the port, and gives you some added juice at the top of the ladder. It's VERY time consuming, but hey... you have lot's of time, right?
-kf |
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15308 Location: Deep in the 405
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Posted: Mon Mar 28, 2005 5:25 am Post subject: |
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You can't read a CHEVY book and build a screaming VW. _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK |
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jackstraw Samba Member
Joined: February 07, 2005 Posts: 206 Location: Port Angeles, Wa
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Posted: Mon Mar 28, 2005 8:36 am Post subject: |
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Can I have my stock 1600DP heads machined to fit 90.5mm p/c or is it wise to buy the new heads? Which heads are best? _________________ If you get confused listen to the music play!
1997 Jetta GT
1984 Diesel Rabbit |
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kevinrocks Samba Member
Joined: September 30, 2004 Posts: 235 Location: Louisville, KY
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Posted: Mon Mar 28, 2005 10:24 am Post subject: |
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I have a slight port job on mine. We got into it, and wasnt exactly sure how much we could port out, so we didn't do a lot, to be on the safe side. I trusted my friend with them, he's ported a few heads, and machine shops have told him they look great. I'm going to port a lot more on the next set of heads I do. _________________ 1969 Beetle - Lowered |
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myolbug Samba Member
Joined: April 09, 2004 Posts: 776 Location: 3 feet behind my head!
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Posted: Mon Mar 28, 2005 5:38 pm Post subject: |
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vwracerdave wrote: |
You can't read a CHEVY book and build a screaming VW. |
I have to disagree with you. The air/fuel mix doesn't know or care what head it's going through. But rather how easy is it for it to do that. The article covered some universal principals. This isn't DRD head porting 101, it is just some tricks that are easy to do to smooth the flow, and speed up the charge. _________________ "To my mind it is wholly irresponsible to go into the world incapable of preventing violence, injury, crime, and death. How feeble is the mindset to accept defenselessness. How unnatural. How cheap. How cowardly. How pathetic." Ted Nugent
candyman wrote: |
i broke my brain over ten years ago and its still dumb |
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Kaferfiend Samba Member
Joined: August 15, 2004 Posts: 439 Location: Selah WA
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Posted: Tue Mar 29, 2005 1:32 pm Post subject: |
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vwracerdave wrote: |
You can't read a CHEVY book and build a screaming VW. |
A Chevy engine is just as much of an air-pump as a VW engine. They benefit from the same adjustments, and/or mods. Porting, compression, duration and lift all have the same effect.
Just cause it's a VW, doesn't mean it works different. It just looks different.
-kf |
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Rocknrod Samba Member
Joined: November 02, 2004 Posts: 2157 Location: North Carolina
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Posted: Tue Mar 29, 2005 6:55 pm Post subject: |
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vwracerdave wrote: |
You can't read a CHEVY book and build a screaming VW. |
Can you read a primer on internal combustion engines and learn something about a VW? |
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