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carbs for a 2.7
I am thinking of changing to carbs on my 2.7 so I can run a hotter cam. What would be a good baseline start as far as size, jets etc. I would bolt them on to my engine which currently has SC cams in it to make sure everything works, then pull the engine and swap cams. So I would need a setup to work in those parameters. Not sure on final cam choice yet.
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Donnie Currently Porsche-less..... 
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07-19-2007, 06:50 AM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Donnie:
The real limitation in cam choices in a CIS engine are the pistons. Unless you change those to ones with double valve reliefs, you are stuck using the 964 cams.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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07-19-2007, 07:14 AM
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will the 964 cams cause reverb on the airflow sensor plate in the CIS air meter?
I knew I should have changed pistons when I rebuilt it!
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Donnie Currently Porsche-less.....
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07-19-2007, 07:35 AM
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Location: Portland Oregon
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964 cams are the most aggressive ones that are still compatible with CIS,......
 No worries, sir.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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07-19-2007, 08:31 AM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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Steve, I have heard read on the engine board that a 964 cam will not clear the 2.7 CIS piston dome. I presume on the exhaust side. Can you confirm? It would be good information for the board. I am not sure if this is the 2.7 or the 2.7S piston.
Donnie. YOu could have valve pockets machined into your CIS pistons.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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07-19-2007, 08:42 AM
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I am going to have to buy a mill to stay in this game
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Donnie Currently Porsche-less.....
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07-19-2007, 08:43 AM
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'74 Porsche 911 2.7
