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-   -   Header experts - real quick question (http://forums.pelicanparts.com/porsche-911-technical-forum/101073-header-experts-real-quick-question.html)

pbs911 03-07-2003 08:34 AM
Header experts - real quick question
 
never mind I'm an idiot sometimes. Unless Bill V's page is wrong I know the answer.

Jack Olsen 03-07-2003 09:12 AM
I'm no expert, but I've always heard that 1 3/4 ID is best for a more-or-less stock 3.6, and that 1 7/8 ID provides a greater benefit for modified race motors.

pbs911 03-07-2003 09:27 AM
Jack, that's exactly what I thought. I found conflicting reports. But here is a quote from Bill V's site.

Quote:
Originally I tried to retain the SSI headers from the 3 liter, but I found that the primary tube (1 1/2" 38mm OD 1 3/8" 35mm ID) was far too restrictive for good power at the top of the rev range. Subsequently B&B ss headers(w/heat) were installed(1 3/4" 44.5mm OD, 1 5/8" 41.28mm ID primary tube), the engine is now properly responsive at all rpm.

BTW, any progress reports on BBII?


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