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timing

 
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orangatangus
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PostPosted: Sat Mar 21, 2015 5:48 pm    Post subject: timing Reply with quote

Is this right...1776, ae block, petronics in a 009 dizzy, degree wheel and twin 36 dells just rebuilt. compression 135 all around and 38 lbs oil pressure @ 1100

Runs smooth at 1100 rpm at 30 atdc try to advance it and rpms climb up to 3000 rpm,no visible fuel inside carbs

So thats where I'm at,haven't adjusted carbs yet but there at the starting specs.
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leducland
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PostPosted: Thu Apr 02, 2015 12:50 pm    Post subject: Reply with quote

30 seems high to me. I have a similar setup but with 40mm Kadrons. Open throttle brings it up to around 30, idle is around 10. After adjusting the carbs I was able to get the timing advance down at idle.
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berliner
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PostPosted: Fri Apr 03, 2015 3:06 pm    Post subject: timing Reply with quote

Atdc is After top dead center...it should be around 7 BEFORE TDC static timed to get started,then time with a light to 30 (double check this number,I might be out,due to old age memory loss) total advance
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leducland
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PostPosted: Sun Apr 05, 2015 4:06 pm    Post subject: Reply with quote

I believe that's 30 ATDC at 3500 rpm or after the 009 stops advancing. From what I've researched between 28 and 32 ATDC is what you want at open throttle. Obviously it will be much less than that at idle.
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berliner
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PostPosted: Sun Apr 05, 2015 6:04 pm    Post subject: timing Reply with quote

After???
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leducland
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PostPosted: Sun Apr 05, 2015 9:35 pm    Post subject: Reply with quote

below (after) based on this thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=499289

and this: http://www.type2.com/library/electrip/bosch009.htm

you are right Berliner, 30 total advance but 30 at 1100 rpm is too high I believe.
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berliner
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PostPosted: Mon Apr 06, 2015 7:49 pm    Post subject: timing Reply with quote

Too much at 1100,surely,but my argument was that timing is measured in degrees BEFORE TDC,not ATDC.At 30 degrees after,it would run like a bag of squirrels and get really hot!
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silas
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PostPosted: Thu Apr 09, 2015 11:27 pm    Post subject: Reply with quote

BTDC = before top dead center = advanced timing

ATDC = after top dead center = retarded timing

not sure about the original posters application, but the 009 distributor on my 1600 dual port likes 30 degrees BTDC/advanced timing (max advance) at 3000-3500rpm. and then the timing at idle falls where it may (usually between 7-10 degrees BTDC/advanced timing). also be aware of pinging, overheating and fuel used and make slight adjustments accordingly.

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