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Old 11-13-2008, 10:39 PM
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Todd Miller Todd Miller is online now
1966 250SE Coupe Owner
 
Join Date: Jul 2005
Location: San Luis Obispo, CA
Posts: 581
Got some miles put on it today, and spent some time dialing in the mixture, timing, idle and linkage. My buddy's shop's exhaust gas analyzer is down right now, so I couldn't take the easy route.

What do you 6 cylinder SE guys like to do for ignition timing? The book says 30 degrees BTDC at 3,000rpm+ and if I go by that, I wind up with something in the 3 degrees ATDC at idle and it won't start hot after sitting for 10-15min unless you crack the throttle during cranking. If I give it 5 or so BTDC at idle, I wind up with 36+ degrees at 3 grand, but it starts more normally.

There are a couple steep residential street around, and they make for good ignition timing testing by hitting them at say 20mph, shifting into 2nd or 3rd, flooring it, and listening for the engine to start pinging. So far, I'm not getting any pinging under load, and I'm thinking about giving it more advance, like say 8-10 degrees BTDC (as long as I can keep the idle in the 750-800rpm range using the mixture and idle air settings).

Any tuning advice welcome.
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1966 W111 250SEC:
DB268 Blaugrün/electric sunroof/4 on-the-floor/4.5 V-8 rear axle
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