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Registered User
Join Date: Oct 2016
Posts: 2
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Replace 911s cam with 964 cam
Hello
I have a Porsche 911s of 1974. I have read that you can benefit from taking camshaft with 964 profile. But searched for documentation on how to doe, what it takes around timming and must i reinforced valve spring, but can not find anything. Does anyone here have experience with this conversion? |
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10-21-2016, 07:52 AM
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Member 911 Anonymous
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Go to the Engine Rebuild forum.
Can not confirm if you can drop 964 cams into the 74. As far as springs, I recently swapped and used original springs. Now CAM Timing, that is always fun thing to do. Break a Leg!
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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10-21-2016, 09:20 AM
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RETIRED
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Requires removal of the power steering lobe. Best to regrind an early cam to 964 specs.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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10-21-2016, 10:46 AM
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Registered User
Join Date: Oct 2016
Posts: 2
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That was what i ment with 964 profile, that was old cams grained to 964 spec.
But will it work with benifit and should timing setting be with this new cams. |
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10-21-2016, 12:02 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Here is what is available. Contact John Dougherty for details on your specific needs.
Dougherty Racing Cams Porsche 911, 930 and 964 camshaft profiles http://www.elgincams.com/c-por2.html http://www.webcamshafts.com/mobile/automobile/porsche/porsche_911_sohc_12v.html
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage Last edited by Trackrash; 10-21-2016 at 12:45 PM.. |
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10-21-2016, 12:41 PM
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Registered
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Aren't the cam towers different, 3 journal versus 4 journal from the 74 S versus the 964?
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-Jayson 1976 911S Signature Edition - 3.2SSt (JE 98mm 9.5:1 pistons, 964 Cams, Carrillo Rods, ARP Head Studs, AASCO Valvetrain, 3.2 Carrera Manifold, ID725's, B&B Headers, TS HyperGate45 Gen V, TS RacePort, BW S360, AEM Infinity 506, E85) IG: Signature_911 |
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10-21-2016, 01:12 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Quote:
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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10-21-2016, 01:39 PM
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Registered
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Does your car still have the original 2.7L CIS engine in it? A cam switch can certainly be an improvement, but there are other things that need to be done to make it worthwhile.
If your '74 still has it's original CIS injection you will not be happy with the change - the original cams were designed to work with that induction system. To make it all worthwhile you'll also need to change the injection to carburetors or one of the aftermarket electronic systems and also change pistons. Even after those changes your heads will only be able to flow as much as their ports and valves allow. There isn't much more horsepower available to the 2.7 unless you start spending a great deal of money, and then it makes more sense to change to a later model larger engine such as a 3.2.
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Bone stock 1974 911S Targa. 1972 914/4 Race Car |
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10-21-2016, 02:09 PM
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Marble Grey
Da cab
My Garage
1971 Porsche 911
Baja Bug
1976 Porsche 911S 1979 3.0
1974 Porsche 911S Targa
