Classic cars forum & vehicle restoration.
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Rdover
Joined: 26 Nov 2007 Posts: 413
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Posted: Thu May 10, 2012 3:16 pm Post subject: creating timing marks |
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Having converted my car to coil/dizzy from magneto, it would be nice to now try to get it timed up a little more scientifically than "mmmm .... errrr ... aye, that'll do".
I know where TDC Cyl 1 is and the circumference of the flywheel is 1080mm. Do I simply divide 1080mm by 360 to give the distance between degree marks (3mm)? Or am I missing something obvious?
If I'm right, then static timing should be ~35deg btdc or 105mm before the tdc mark. It then becomes easy to mark up 30deg to 40deg range so I can see what I'm doing when I adjust the dizzy.
Any stating of the bleeding obvious greatly appreciated _________________ Richard |
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Penman
Joined: 23 Nov 2007 Posts: 4756 Location: Swindon, Wilts.
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Posted: Thu May 10, 2012 3:59 pm Post subject: |
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Hi
Yes that is the correct way to find the length of 1 degree etc
Out of interest, how did you measure the circumference and have you done a ΠD (2ΠR) calculation to check it? _________________ Bristols should always come in pairs.
Any 2 from:-
Straight 6
V8 V10 |
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Rdover
Joined: 26 Nov 2007 Posts: 413
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Posted: Thu May 10, 2012 4:12 pm Post subject: |
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I used a bit of string!
I did use piD to check it as well but It was last year so I'll re-measure and re-calculate a few times before marking anything up. _________________ Richard |
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Uncle Alec
Joined: 14 Jan 2008 Posts: 734 Location: Manchester
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Posted: Thu May 10, 2012 4:45 pm Post subject: |
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Exactly what are you timing here Rdover? Not ignition presumably; at least, 35 degrees sounds way over advanced to me if it is. |
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Rdover
Joined: 26 Nov 2007 Posts: 413
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Posted: Thu May 10, 2012 6:49 pm Post subject: |
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Yes. I have the car very close to ideal so by marking up the flywheel I can see what the current advance is and work from there.
Remember it is a 1912 side valve engine. _________________ Richard |
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