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Registered
Join Date: Aug 2007
Location: Austin, TX
Posts: 328
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Weber manifolds:: Port match or not?
OK All,
I thought I'd post a poll to get some feedback on whether or not I should try to port match my manifolds to my heads. I have stock early Weber manifolds that are 32mm at the head (IIRC). My heads have 35mm ports, and will have phenolic resin spacers (35mm) between the manifolds and heads. Webers will have 34mm venturis. Build is as follows: 2.7RS-ish build, Euro pistons, 8.8:1 compression, "E" cams, stock heads and valvetrain, 40mm webers for induction. Here is my dilemma: Jamie Novak has loaned me the tools to port match my manifolds to my heads. I have been told by one reliable source not to mess with port matching. My biggest concern is that I will jack up the flow between the runners resulting in uneven airflow to the cylinders. I've entertained the idea of trying to find a flow bench here in Austin so I can ensure that they all flow evenly. All comments are welcome, and please vote in the poll!! 
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08-13-2009, 08:58 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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I am a believer; did this on my MFI, but never Webers.
__________________
- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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08-13-2009, 09:06 AM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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My best and only advice is to get the correct manifold for your engine and that means the PMO ones.
__________________
Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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08-13-2009, 01:56 PM
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Registered
Join Date: Nov 2008
Location: Michigan
Posts: 642
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I had my entire intakes flow matched. You would atleast want to port match the intakes.
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08-13-2009, 02:52 PM
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