speedyxjs
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| posted on 14/11/09 at 08:41 PM |
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Head porting and polishing
I know a few people have done this and im thinking about doing it with my spare head to change over post IVA (unless i get time and money to do it
post IVA).
I know the basics but have never done it before and wanted to knwo if there was a good step by step somewhere out there 
How long can i resist the temptation to drop a V8 in?
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rusty nuts
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| posted on 14/11/09 at 08:47 PM |
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Theory and practice of cylinder head modification , practical gas flow?
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02GF74
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| posted on 14/11/09 at 08:48 PM |
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google is your friend, as indeed it came up with this - happens to be posted not too long ago on here.
http://www.torquecars.com/tuning/Porting-polishing.php
frist ste[ is to match inlet/oultet to gasket and smooth but not polish the casting surface.
next step is to open out he ports - thats where as bit of tnought/knowledge is required.
on my crossflow, I used socked to drop through the ports to match them to size and to open out - risky work as you can break into a water way or as in
one case, through to the exhaust bolt hole. 
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snapper
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| posted on 14/11/09 at 08:51 PM |
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what engine?
What head?
Polishing does nothing just makes you feel better, porting does help depends on the engine i.e Pinto head has huge ports so work is needed in the area
behind the valve seat but no need to open the ports unless you have serious flow needs.
You can make a big mess if you port your own head without having some way of measuring the results.
Research, take stock and start easy
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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speedyxjs
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| posted on 14/11/09 at 08:55 PM |
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Jaguar 3.6 AJ6
How long can i resist the temptation to drop a V8 in?
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Rod Ends
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 posted on 14/11/09 at 08:56 PM |
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Read David Vizard
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will121
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| posted on 14/11/09 at 09:33 PM |
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quote:
Originally posted by Rod Ends
Read David Vizard
that link is where i started, made me rethink what i should do DIY porting. it is time consuming enough on a 4 cylinder though!.
Looks like ive made some improvements on mine my ported head link
[Edited on 15/11/09 by will121]
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mark chandler
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| posted on 15/11/09 at 07:49 PM |
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Port matching and smoothing things should deliver good results.
First thing is to get some HSS burrs off Ebay, no point mucking around with grinding stones.
I then got a £5 drill to run them, unless you have a compressor which can sustain a very high CFM rate then electric is the way to go. As you will be
loading the drill the wrong way get something that can break without breaking the bank. The higher the speed it runs the better.
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