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Registered
Join Date: Dec 2000
Location: Norway / Merritt Island FL
Posts: 220
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Max RPM
I'm currently building a 2.7 with JE pistons, CIS, and 964 profile cams. What maximum rpm should I plan for on this motor? Maximum meaning occasional, not constant.
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Sigurd 73.5T 3.2SS EFI X87 944S 3.0 Last edited by Sigurd; 02-19-2008 at 06:56 AM.. |
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02-19-2008, 06:38 AM
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Join Date: May 2003
Posts: 3,346
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The first limitation is the valve springs. With stock valve springs and retainers you should not exceed the stock 964 rev limit. I don't know what that is, but probably around 6500. The bottom end is good for 7000 with occational trips to 7500. With stiffer valve springs and/or titanium retainers the valve train will be good for 7500 or so.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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02-19-2008, 09:36 PM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Sigurd,
964 cams have peaked by 6500 RPM so running the engine beyond that simply constitutes abuse,....  Re-gear the car to always keep the RPM between 4500 & 6300 at each shift and you'll be just fine.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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02-19-2008, 11:55 PM
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