Ignition advance curve for TS engine - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 5 (permalink) Old 03-08-2006, 07:40 AM Thread Starter
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Ignition advance curve for TS engine

Hello,

i'm currently installing an aftermarket ignition system on a TS engine (from a 75 2.0TS) to have it run on carbs. The cams are stock, the engine has a rebuilt head, runs on 98 unleaded and has Lodge plugs.
I wonder if anybody has info about ignition maps to feed the new ecu?
I can make it work with or without vacuum correction, so a basic ignition advance vs rpm curve would already be enough to start the engine.
any help appreciated.

Best regards,
zp
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post #2 of 5 (permalink) Old 03-08-2006, 04:48 PM
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Jim Steck of autocomponenti would probably be a good person to talk to.

Generally, twin spark needs way less advance, especially at higher rpm than single plug.
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post #3 of 5 (permalink) Old 03-08-2006, 10:25 PM Thread Starter
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Hi,

Thanks for the answer i'll email him soon!

Best regards,
zp
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post #4 of 5 (permalink) Old 03-09-2006, 08:00 AM
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I have one of Jim Steck's mechanical advence distributors on my '65 Sprint GT which is running a 2-L TS with 45DCOE's. I asked Jim about the advance curve and he said he set it up to be the same as a GTA. I set the timing to 28 deg at 4500 rpm and that seems to work fairly well. However, I think it could use a bit more advance at higher rpm, about 1 deg per 1000 rpm would be nice.

Bruce Colby - Street = '69 1750 GTV/TS; Track = '65 SGT/TS, '89 E30, '72 914/6
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post #5 of 5 (permalink) Old 03-09-2006, 08:09 AM
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FWIW, stock GTA was 29 degrees max and Autodelta GTA was commonly 35 degrees max.
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