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Somatic Negative Optimist
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Is an SC-cam exactly the same as a Carrera-cam?
Is it possible to use a Carrera cam in an SC and Visa versa?
Like same lift, lobe-position, bearing size, etc.?????? Thank you. 
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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08-20-2005, 06:23 AM
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Moderator
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Yes
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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08-20-2005, 06:32 AM
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RETIRED
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Yeah...but why would you?
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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08-20-2005, 06:39 AM
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Somatic Negative Optimist
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I could shop for either cam, have a set reground to 964-specs and keep my SC cams just in case.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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08-20-2005, 06:45 AM
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RETIRED
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964 cams really woke up my SC motor....
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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08-20-2005, 06:47 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Gunter, I have a set of regrind Carrera to 964 cams if you are interested. Fresh, never installed.
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08-20-2005, 07:21 AM
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Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 12,025
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I have SC cores and 964 regrinds with 15000km on them.......
Jeff
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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08-20-2005, 07:34 AM
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Registered
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Quote:
Cheers |
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08-20-2005, 07:51 AM
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Somatic Negative Optimist
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Thanks guys, here are my options:
I have an offer of a pair of 964-cams but they didn't look clean in the pictures; the seller is getting an opinion from a camgrinder on their actual condition. I would prefer 964 cams. Next option is to regrind my SC cams to a 964 profile. Camgrinder John sees nothing wrong with that and informs me that only about .015" would come off the base-circle. But I don't know how deep the hardening is on these cams? How does regrinding affect the hardening? This is a long-term, slow project on a seperate engine which gives me time but I need to make a decision at some point.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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08-20-2005, 07:51 AM
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Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 12,025
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The hardening, according to John, will still be there on the regrinds.
Jeff
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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08-20-2005, 09:06 AM
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Registered
Join Date: Aug 2001
Location: SoBay, SoCal
Posts: 1,369
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HIJACK--sort of.
1) What's advantage of 964 cams on 3.2 Carrera? 2) Would this be smog legal in Cali? thanks Mike '86 coupe
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Mike '86 911 coupe '85 BMW 535i '11 Cayenne |
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08-20-2005, 09:19 AM
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Somatic Negative Optimist
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The 964-cam just gives you more lift; meaning: The intake valves stay open longer to suck in more mixture. That will only work if you also get larger intake runners with ~38.5mm I.D. and bore out the heads to 38.5mm.
The early SC's '78-'79 had larger runners but in '80, the I.D. changed to 34mm. Does a Carrera have the same smaller intake runners as the '80-'83 SC's? A change of cams will not affect smog checks but changing the cams alone makes no sense; other stuff will also have to be done to give you more HP.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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08-21-2005, 06:50 AM
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Registered
Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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IIRC, the 964 lobes are shaped a bit differently - better technology after 15 years... This is imp. b/c it modifies the accelerative forces that the valve sees.
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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08-21-2005, 12:49 PM
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Location: Langley,B.C.
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I think Randy is right, the lobe "ramp" I believe is a little steeper as well. The cam is a good upgrade if you taking apart the motor anyway, not sure I would do it just for the sake of it. The 3.0 I just rebuilt seemed well suited for the 964 grind we put in it, made a nice strong smooth motor. Car should still pass Cali emissions easily. It has the same lobe center as the SC cam which limits overlap and helps it run fairly clean.
Jeff
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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08-21-2005, 04:18 PM
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Join Date: Feb 2004
Location: California
Posts: 926
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The 964 cam works well in both the 3.0 and 3.2 engines. I think most people would agree the upgrade is a good "while your in there upgrade" and not worth the effort of an engine drop just to change cams.
MY new "DC-13" profile is in between the SC and 964 cam. No feedback on the cam yet, but I predict it will work best in the low compression ratio 3.0 litres. I have never heard of a 964 cam not passing an emmisions test.
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John Dougherty Dougherty Racing Cams |
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08-21-2005, 04:29 PM
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Location: Chalfont Pa
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I have 964 cams in a 78 motor. I hope you are uping the compression on that motor along with the regrind. Also ssi's and two in one out or two in two out exhaust. If you do just the cams I think you will be alittle bit dissapointed in the out come. engine will pull hard but you will lose low end grunt. Atleast this is what happened with my car.
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08-21-2005, 05:25 PM
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Somatic Negative Optimist
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Nothing like stealing someone's thread; along with other stuff, this post has made me decide on how to proceed with my rebuild.
Odd how it works out sometimes; get more 911-time before winter comes.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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08-23-2005, 07:25 AM
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Join Date: Aug 2005
Location: redwood shores Ca.
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I have a 78 3.0 in my 75 carrera,
jerry woods did the complete rebulid, 964 cams late sc P/C's 9.3/1 ssi dansk 2/2 dyno CBHP 210.2 @6250 rpm PHI 1.163 (209.1 @6500 RPM) CBT 191.5 @5000 rpm |
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08-23-2005, 12:22 PM
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Registered
Join Date: Jan 2003
Location: Langley,B.C.
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?
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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08-23-2005, 01:38 PM
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Somatic Negative Optimist
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'75 Carrera with a 3.0 liter sounds like fun.
That's similar to my set-up except I went for 98mm Mahle cylinders with JE pistons. These 98mm JE's are a work of art; custom-made 9.8 CR and matched to the barrels by EBS. I am doing a SS 3.2 just for the hell of it, my real aim is to find a clean 964 and do some mods to it. Did you stay with 6's or were you able to fit a 7 in the rear?
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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08-24-2005, 07:21 AM
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ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
Da cab
1981 Porsche 911 SC 3.0 L
