| [ Total Views: 550 | Total Replies: 2 | Thread Id: 19678 ] |
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 Quoll
Officially Full-On Dubber
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| posted on March 1st, 2004 at 05:15 PM |
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Head P&P
G'day one and all
Does any one have any good do-it-yourself head P&P guides other then these two
The cal look one
and the
Aircooledtech one
Any hot tips/personal experince with doing this sorta thing?
Thanks Justin
p.s once I am finnished I'll post some pics for those interested....
[Edited on 1-3-2004 by Quoll] |
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Quoll
Officially Full-On Dubber
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| posted on March 3rd, 2004 at 05:40 PM |
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:bounce |
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GL1972
Wolfsburg Wizard
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| posted on March 4th, 2004 at 08:38 PM |
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Justin,
I ported and polished my CB044 heads. The biggest tip I can give is to do the same task on each chamber/port before moving on to the next task. ie:
unshroud ALL intake valves then unshroud ALL exhaust valves then smooth the unshrouding into the rest of the combustion chamber then do the polishing.
Don't go all the way with the polishing until you measure the CC of each combustion chamber. Using the method above you should get each chamber
pretty close to each other with just a little bit of matching to do. Same tip with the ports: do each task on each port before moving on to another
task. If you don't do this you tend to take less metal off or the shape is different from the first to the last one you did.
I'm no expert but this is the logic I have used on 3 x VW, 3 x rotaries, 1 x 6 cylinder and 2 x V8s over the years. Seems to work and reduced
extra matching at the end of the job.
The sites you have mentioned are pretty good guides for porting of VW heads.
One last tip: It's OK to super polish the exhaust port but not the intake. Remember you want the fuel/air mixture to swirl into the chamber if at
all possible. Real shiny intake ports don't help much.
Brendan
:jesus |
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Che Castro
Custom Title Time!
ankle straps
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| posted on March 4th, 2004 at 10:22 PM |
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The old book "how to hotrod VW engines" has a thorough chapter on how to port and do head work. It also shows u how to blueprint an oilpump
and more
its really dated and old but still has some good bits
Jon
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70AutoStik
Insano Dub Head
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| posted on March 5th, 2004 at 08:06 PM |
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This is the surprisingly good one on the actual how:
http://www.sa-motorsports.com/diyport.htm
They talk V8s, but the theory is sound for any head (read their advice on choice of grinder and speed in particular.) And, yes, the kits are
available in Oz - check their contacts.
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