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Anarchist Extremist
Join Date: Nov 2005
Location: Vermont
Posts: 419
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Cam timing? 3.0sc cis w/964 cams
What timing should I use for a 964 cam-ed CIS 1980 SC? I am thinking I should follow timing for the 1978-1980 R.o.W. 911SC, but mayne some tuners out there have a better idea?
thanks for any input. Chris
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80 SC Coupe 00 Tundra (Tow Rig) 00 Audi A6 Avant (wifes rig) 03 Wife ('71 typ Spezial) 05 Kid (MENSA prototype) |
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02-22-2008, 04:18 PM
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Join Date: May 2003
Posts: 3,346
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I think you should use the timing from the 964 engines. There is a plus or minus to that spec and you can go to one end or the other depending on what you want. If you still have the small ports (34mm) I would go on the advanced side. If you have larger ports then I would go on the retard side. Sorry I don't know what the 964 spec is.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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02-23-2008, 01:00 PM
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Capitalist and Patriot
Join Date: Sep 2006
Location: Freedomville
Posts: 1,923
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You might check with pelican name "Jeff Alton" he's built a couple of these 3.0 w/964 cams and seems to know his Porsches...
Good Luck, this is my next "major" project, so I'm taking notes!
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Former Test driver & Production Manager Singer Vehicle Design 2009 Cayenne GTS, '81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold)  , '68 912 Targa (sold)  , '69 911E (sold) "Dream it, Believe it, Decide it, DO it " |
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02-23-2008, 02:36 PM
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Join Date: Feb 2005
Location: Jupiter, FL
Posts: 306
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1.26mm.
Same as 3.2 Carrera (1.1mm to 1.4mm) This came from EBS for 964 re-grind cams. CIS car ran great at this setting with lots of torque. Lyn
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Track: 91 C2 SuperCup wannabe, 08 Cayman S Street: 85 RUF BTR Slant-nose, 70 911 T Coupe Pastel Blue Projects: 82 911 SC 3.6, 72 911 T Coupe, 74 914 Signal Orange |
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02-24-2008, 06:16 AM
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Join Date: Jan 2003
Location: Langley,B.C.
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I have set these at 1.26 in the past with both the 3.0 and 3.2 motors and been happy. I have not experimented with advancing or retarding them with in the spec range to see if there was any differnce to be noted.
Cheers
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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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02-24-2008, 09:35 AM
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Join Date: Feb 2001
Location: Dallas
Posts: 187
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Talk to Elgin Cams
I have 964 cams in my 81SC and I think it could use some more low end power. It pulls like mad up to 7,200 rpm. I think I am going to retard the timming 2 degrees.
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Kenneth Silver 81' Targa |
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03-06-2008, 07:12 AM
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Quote:
I ran a set of Elgin SC sports recently. I had to ask him for the specs, and he replied "2mm". I've heard this grind is similar to the 964.
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Jon |
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03-06-2008, 07:10 PM
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Quote:
-Andy
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72 Carrera RS replica, Spec 911 racer |
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03-06-2008, 07:40 PM
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Join Date: Feb 2001
Location: Dallas
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"The 964 and the SC improved stock or the sport SC. The sport sc is timed @2.0 mm with 0-lasssh the 964 is timed by the factory .004 lash @1.26mm lift at lap. I always like to advance the cams a few degrees for more low end responce. I hope that this helps. Dimitri"Dema"Elgin"
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Kenneth Silver 81' Targa |
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03-10-2008, 08:31 AM
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Anarchist Extremist
Join Date: Nov 2005
Location: Vermont
Posts: 419
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Kenneth, So by advanced you mean what. 1.31mm is that OK or more...? I dont know what a sport SC is I dont believe I have one it is a stock 1980 (did come with sport seats) with the small port heads and CIS. I have read about the 964 cam upgrade, so I went ahead and bought a set. could you please expand on this subject? I am thoroughly interested.
thanks Chris
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80 SC Coupe 00 Tundra (Tow Rig) 00 Audi A6 Avant (wifes rig) 03 Wife ('71 typ Spezial) 05 Kid (MENSA prototype) |
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03-10-2008, 09:00 AM
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Join Date: Aug 2007
Location: Auburn Hills, MI
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I did this exact timing 2 months ago: 1.26mm
My engine was a 78 ROW 3.0L with 964 camshafts regrind.
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Red 911 SC euro 78 - 964 cams, Carrera tensionners, new steel head studs, SSI & dansk 2 in 1 |
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03-10-2008, 12:41 PM
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Anarchist Extremist
Join Date: Nov 2005
Location: Vermont
Posts: 419
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so you got it exact? 1.26 or were you .10 either way. I found it almost impossible to get it exact so I settled with 1.3 and 1.31.
Chris
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80 SC Coupe 00 Tundra (Tow Rig) 00 Audi A6 Avant (wifes rig) 03 Wife ('71 typ Spezial) 05 Kid (MENSA prototype) |
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03-10-2008, 02:00 PM
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up-fixing der car(ma)
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That will work fine. Now just check your valve clearance (piston-to-valve) and double check your valve adjustment (elephant foot to valve) and confirm your cams are installed on the proper sides of the engine. These are easy enough mistakes; seems common anyway.
Cheers, Scott
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Scott Kinder kindersport @ gmail.com |
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03-10-2008, 06:59 PM
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Anarchist Extremist
Join Date: Nov 2005
Location: Vermont
Posts: 419
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ytnukler, cams double checked (rabbit right) .004 on foot as per SC gap spec. Piston to valve aint done that, but Jerry Woods taught that we could use solder, I didnt think it was even possible to have valve clearence issues with a US SC with CIS, unless I was a complete idjut, as the CU is so low. thoughts? should I even bother, most say no, you?
Chris
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80 SC Coupe 00 Tundra (Tow Rig) 00 Audi A6 Avant (wifes rig) 03 Wife ('71 typ Spezial) 05 Kid (MENSA prototype) |
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03-11-2008, 11:41 AM
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up-fixing der car(ma)
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I've never seen it that close on SC's, enough that I would have to worry or do something about it.
I always just do it, just in case a customer asks or ...for whatever reason I need that data later.
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Scott Kinder kindersport @ gmail.com |
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03-11-2008, 11:53 AM
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