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Timing Question
1980 3.0 SC
Just tinkering here and decided to check timing at 6K rpm. We had initially set timing at 5* BTDC while at idle. Checking it at 6K rpm, we found only 25* BTDC ! Mechanical advance is fully & smoothly functional. Dizzy has dual vac canister with 2 vac hoses. We reset timing to 35* at 6K rpm and it verified with 15* at idle. Had to tweak the mixture slightly and took it out for a spin, it runs smoother and pulls stronger than ever now, even starts quicker. Idle is very stable at 950-1000. Previous exhaust popping on decel now almost non-existant We're wondering if there is any problem with it being at 15* at idle or is everything OK??? Side notes: 02 sensore disconnected, decel valve disconnected. No pinging even on regular fuel. Last edited by paslantnose; 11-23-2006 at 07:24 AM.. |
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11-23-2006, 07:18 AM
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I've search many many threads that talk of how to time the motor but still no answer to my question of "will 15* BTDC at idle be OK or will it cause problems?
Surely someone here knows? |
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11-23-2006, 01:39 PM
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Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
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As long as you are convinced that 6000 RPM setting is indeed correct I wouldn,t worry about the idle setting as much. It does seem unusually adv. at idle though.When I had a 3.0 original 1980 motor it did,t like to idle well with alot of idle advance.
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1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 |
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11-23-2006, 07:30 PM
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I poured back through many threads on this last night and come up with so many different settings that guys are using it's almost null to read it all.
30*, 32*, 35*, etc I need to do a curve of the advance and chart it out then, compare to known chart i guess. Anyone have the advance curve for a 1980 SC ??? |
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11-24-2006, 02:46 AM
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Moderator
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Spec for your car is
5° BTDC @ 900 ± 50 w/ vacuum detached RoW 23° - 29° @6000 w/ vacuum detached US 19° - 25° @6000 w/ vacuum detached
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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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11-24-2006, 04:02 AM
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Much appreciated Bill.
I guess I need to back her off a little then. Dang, it runs so good @ 35* 
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11-24-2006, 12:30 PM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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as long as it does not DETONATE and u like the way it runs, all is fine.
too much advance=detonation. u will need to richen it up as u said u did. detonation is an engine killer
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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11-27-2006, 03:50 AM
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1980 Porsche 911SC SLANT NOSE 3.0
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
