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Certified Pre-Owned
Join Date: Aug 2002
Location: Nanny State
Posts: 3,132
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Header sizes for a 3.2 ---> 3.4 conversion, beating it to death...
If you had a preference of a header primary size for 3.2 motor turned into a 3.4, would you run 1 5/8" or 1 3/4"? I don't want to choke off my higher rpm power, but it would be nice to pick up some low and mid range torque. Car is a street car that sees occasional DE use. SSI's are out, I'm convinced their tube dia is too small for the job.
Probably splitting hairs but worried about lack of backpressure, etc. Thoughts? BG
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'84 Carrera Coupe |
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12-15-2009, 09:50 AM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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1 5/8ths unless you are turning 8500 rpm.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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12-15-2009, 02:01 PM
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3.4 Bigger is better
Join Date: Nov 2003
Location: South Dakota
Posts: 1,497
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1 5/8 is what I am going to go with. I am planning on using the 993 heat exchangers as I want/need heat. Just about all the threads I have have looked at say 1 5/8 unless you have a really hot cam, then 1 3/4.
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Michael 88 911 Diamond Blue CE Carrera 3.4 HC3.4 member 2020 Honda Passport |
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12-15-2009, 03:36 PM
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