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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Advance Curves Required
Can anyone please post, or tell me where I can find, advance curve plots for the following distributors:
74-77 2.7L 911S 0 231 184 001 78-79 3.0L 911SC and, if different from 78-79 80 3.0L 911SC
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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10-28-2008, 12:54 PM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Anyone have these or a source for them?
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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10-29-2008, 05:30 AM
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Registered
Join Date: Jan 2006
Location: Santa Barbara, CA
Posts: 2,307
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My 74 Tech Spec book says the 74 911, 911S, and Carrera (US) are all the same. With the vac hose disconnected, you want 3.5°-6.5 at 1k, 4.5-14 at 1.5k, 16-24 at 2k, 24-31 at 4k, and 31-38 at 6k. So far as I know, there are no differences between the 74-77 motors which would call for different specs for the later years. The 2.7RS is of course a different story.
Search this site for more; there have been a lot of advance curves shown over the many months I've been here.
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) |
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10-29-2008, 08:41 AM
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Somatic Negative Optimist
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Paul:
I suggest you do it the other way round. List details of your engine like size, fuel system carbs or CIS, compression ratio, octane used and see what the experts recommend re: curve. According to Steve Weiner, cams make no difference for timing; CR, octane and air temps are critical factors. The Bentley lists some numbers for stock SC's on page 280-2. However, if any changes are made to OEM, other curves may be recommended depending on what mods were done. So, what do you have? Engine? Distributor? BTW: You can check the curve yourself by marking the pulley in increments and let someone rev it to specific RPM's while you see the marks with the Stroboscope light. Do it once with vac connected and once with it disconnected. It should show a nice, steady curve if the mech and vac advance are working correctly. IMHO, max advance should not be before 3000 RPM, or even 4k.
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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 ". 
Last edited by Gunter; 10-29-2008 at 10:02 AM.. |
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10-29-2008, 10:00 AM
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