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Registered:
December 2003
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Compression Ratio . 20v head on a 4agze ??
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Tue, 20 April 2004 10:52
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Just wanting to Know the Compression Ratio when you fit a 20 valve head to std 4agze bottom end ..( 8:1 or 8.9:1 4agze ) or can someone tell me the difference in Combustion chamber volume CC between a 20v head and a 16v head ? cheers Cam
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Compression Ratio . 20v head on a 4agze ??
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Tue, 20 April 2004 11:40
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hmm thats a good one..... anyone got specs on a 20V compression?? from there we could deduce the approximate of the two, it will mainly be the extra squish area of the 20V haed that will cause the most change, Johnny should have volume specs on a 20V head?
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Location:
NSW
Registered:
January 2003
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Re: Compression Ratio . 20v head on a 4agze ??
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Thu, 22 April 2004 15:56
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Must be because Rigoli did it that's why i assume most people consider doing this. 
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Compression Ratio . 20v head on a 4agze ??
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Thu, 22 April 2004 16:08
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and what about the valve cutouts?
if someone brings me a 16V and a 20V head, i'll measure the volumes.
Cya, Stewart
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Location:
Carlingford, Sydney
Registered:
May 2002
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Re: Compression Ratio . 20v head on a 4agze ??
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Fri, 23 April 2004 00:28
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who gives a sfa about riggoli's there just another name in a growing list of hipo 20v turbo's
the speedtech 1 always comes to my mind 
and hey who the hell wouldnt want to copy that 
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Compression Ratio . 20v head on a 4agze ??
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Fri, 23 April 2004 01:02
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i like the smallport head
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Location:
NSW
Registered:
January 2003
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Re: Compression Ratio . 20v head on a 4agze ??
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Fri, 23 April 2004 07:14
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Who gives a stuff about them?
How many 4age20v turbos do you know running in a FWD car that can do a high 11-12second pass without NOS. Only one i have heard of.
If you know any others i would truly like to know and links or pictures or workshops that have done this. No bull crap stories either.
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