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eth727
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Joined: February 21, 2007
Posts: 513
Location: san diego
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 Posted: Thu Jun 28, 2012 6:28 pm Post subject: computronix timing question |
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| I have a 1600DP 34pict card with 009 dist and computronix. I've never timed a motor before and my pulley wheel isn't marked for TDC but has 2 notches. I believe the 1st is 7.5 and 10 degrees. Which one should I set my timing to? |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 55685
Location: Long Island, New York, USA
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| Posted: Thu Jun 28, 2012 6:29 pm Post subject: |
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Get a timing light that you can "dial" in the advance and then use the TDC mark. A 009 needs to be timed at full advance, not at idle.
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74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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modok
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Location: Colorado Springs
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| Posted: Thu Jun 28, 2012 6:37 pm Post subject: |
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find TDC, mark it, measure about 2 inches to the right, file a line there. Time it to that line at 3000 rpm
Last edited by modok on Fri Jun 29, 2012 12:16 am; edited 1 time in total |
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Glenn
Mr. 010
Joined: December 25, 2001
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Location: Long Island, New York, USA
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| Posted: Thu Jun 28, 2012 6:43 pm Post subject: |
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| modok wrote: | | find TDC, mark it, measure about 2 1/4 inches to the right, file a line there. Time it to that line at 3000 rpm |
A little too long and it's at 34* and will run hot.
Print a degree wheel.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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www.DasVolks.com
Long Island's Aircooled Club |
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modok
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Joined: October 30, 2009
Posts: 8647
Location: Colorado Springs
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| Posted: Thu Jun 28, 2012 6:58 pm Post subject: |
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Ah, yes, that is a very nice degree wheel thingy Glenn! I have used that a few times  Not sure if I'd use that "in the field" tho, tape don't stick to oil very well
If you want to be more picky you don't have to take my word for it
There are 360 degrees in a circle, so you just take the circumphrence of the pulley(diameter x3.14 or measure around it with your tape measure)....divide by 360, then multiply by the number of degrees you want, and there is your measurement
It works on all circles, all engines
2" was for a stock size pulley, if you have aftermarket pulley then maybe you better check that 
Last edited by modok on Fri Jun 29, 2012 12:16 am; edited 1 time in total |
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OLD VW NUT
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Joined: February 23, 2011
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Location: Sunny Eastern Washington
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| Posted: Thu Jun 28, 2012 10:00 pm Post subject: |
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I just measured the 6 3/4" pulley on my 2110. Since its on the bench its easy to do. At 1.65" it measures to 28 degrees - 2 1/4" measures almost 38 degrees advance. Too much advance for my motor! Better recheck the math modoc.
Here's how its figured: Diameter of the pulley times pie (3.14) divided by 360 which is the number of degrees in a circle = the distance of one degree.
So:
6.75x3.14 = 21.195 / 360 = 0.058875 = the length of 1 degree on my pulley
28(desired target timing mark)x0.058875=1.65" - which is where you'll find the 28 degree timing mark.
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modok
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Location: Colorado Springs
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| Posted: Fri Jun 29, 2012 12:15 am Post subject: |
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Your right!
I get 1.950" for 32deg
I guess I should follow my own advice eh?  |
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