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Porsche 944S Club Sport
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Guy's n Gal's:
![]() Each valve provides a 8% flow increase & no special valve springs or retainers needed. Proper Cylinder head Port work would improve flow even more but a flow bench would be required & locally available. Rev up to 8k safely. The older oem Porsche sodium filled exhaust valves were made of a different alloy, hollow and filled with sodium for improved heat transfer such that the valves would not break and keep them cooler above 900'F. Over time they become brittle and fail. The newer Stainless Steel alloy valves provide strength, cool better and longevity to the valve train system Turbo or non turbo. There are Zero "0" issues at all. Cost is typically ~40 to 50% less than OEM and easier to obtain and manufacture. ![]() Why these valves improve performance? These SS valves are undercut at their throat and provide a swirl flow towards the edges of the valve. That promotes improved fuel atomization, Intake stroke cooling and Better air distribution within the cylinder before beginning of ignition/combustion stroke. Weight is ~ the same or lighter. I have been using the same valves for years. Since 2001 NIRA/NDRA/NHRA race season. Go to my site and see the work and parts installed on both my 944S and Conquest TSI. " No Jedi mind trick, remember" ![]() **copied from my original press release post** ![]() ![]() ![]() ![]() ![]()
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Guru944 ![]() 2006 955 Cayenne S Titanium Series - Marine Blue, 1987 Porsche 944S Club Sport. 1987 Buick Turbo-T Lightweight "Great White", +500HP, TA49 Turbo. http://www.blackbirdmotorsports.com, 944/951/968, 911 and 955/957 Performance Solutions. Thank you Lord, for your Loving Kindness, Tender Mercy, and Grace. Only You are Faithful. |
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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I recall a few years ago I think some people were trying used nascar 9mm stem valves and cutting them down for other applications. I don't recall any special positive results.
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