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vwsb74 Samba Member
Joined: July 30, 2009 Posts: 1201 Location: socal
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Posted: Sat May 29, 2010 7:32 pm Post subject: how to time after market pulley now notch |
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hi, how can I check the tdc on the pulley? the pulley has no notch at all?thanks _________________ 74 super beetle
2011 ford explorer traded
2010 mazda 3 hatchback
2014 Honda odyssey
2180cc 48IDA clone
Xr310 cam =171hp@6k rpm sold so as the car😢 |
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Glenn Mr. 010
Joined: December 25, 2001 Posts: 76897 Location: Sneaking up behind you
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Posted: Sat May 29, 2010 7:35 pm Post subject: |
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The woodruff keyway is at 90 degrees ATDC
_________________ 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"
Member #1009
#BlueSquare |
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Bruce Amacker Samba Member
Joined: December 26, 2007 Posts: 1786 Location: Cleveland, Ohio
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Posted: Sun May 30, 2010 8:25 am Post subject: |
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Although Glenn is correct, that is not accurate enough to base your TDC measurement on for timing. There's been a sticky on this for a while- look near the bottom of the first page for an easy accurate method of locating TDC:
http://www.thesamba.com/vw/forum/viewtopic.php?t=233078
From there you can use a timing light with advance built in to find your 30-32°, or use basic mathematics. Measure the circumference of your pulley with a wide flexible cloth tape measure, most are about 21-22". Divide this exact measurement by 12 to get 30°, which is near where you want your total timing at 3000+RPM.
Example:
If it is 21” circumference ÷360= .058333” for one degree, or
21” ÷12=1.75” for 30°. (.058333"x30=1.74999")
30°= 1.75” from TDC.
Helpful hints- put a piece of white masking tape on the pulley where you'll be making your marks and use a very sharp pencil or fine tip pen. Once the marks are found use the corner of a file to make a permanent "nick" in the edge of the pulley for your marks. Use a toothpick dipped in white paint to fill the nick for more visibility with a timing light.
Good Luck! _________________ '66 Deluxe Bus
'65 Standard Bus
Build threads:
'66- http://www.leakoil.net/forum/viewtopic.php?f=23&t=2888&sid=54d8dedfb3822f99c7f2ea430cb4e856
'65- http://leakoil.net/forum/viewtopic.php?f=23&t=4263 |
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