Offset Woodruff Key 649 Cam
| Quote: Posted by Beaker.
Hi,
I will be fitting the good old 649 Camshaft into my Mini, ideally the vernier duplex timing wheel would be the shit.. but very pricey, and also out of stock. So the next option is obviously the offset woodruff key, the big question is how much offset. Can anyone give me an indication as to what sizes to try, I dont mind gettng 2-3 of them to try out.
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Further Thought on this, Is it possible to do the following
Given the crank gear is 20 teeth, on a 2:1 ratio I would assume the crank gear is 40 teeth. meaning each tooth in the cam gear is 9 degrees, that is if you needed to offset 9 degrees, you would simply move down a tooth.
With the assumption the woodruff key is the same on the cam gear as it is on the crankshaft, I could achieve all degrees with just 1x 2 degree, 1x 4 degree
my guess is that the larger the offset in the key, the more weak it is.
To achieve 1-9 degrees
1 degrees = 2 degree woodruff on the crank gear (assuming 2:1 ratio would offset cam gear 1 degree)
2 degrees = 2 degree woodruff on cam gear
3 degrees = 4 degree on cam gear, reversed 2 degree on crank gear (achieveing -1 degree on the 4)
4 degrees = 4 degrees on cam gear
5 degrees = 4 degrees on cam gear, 2 degrees on crank gear (2:1 ratio) or reversed 4 degrees on cam offset 1 chain link
6 degrees = 4 degree reversed woodruff on cam gear, 2 degrees on crank gear (2:1 ratio) 1 offset chain link
7 degrees = 2 degrees reversed woodruff on cam gear 1 offset chain link
8 degrees = 2 degrees reversed woodruff on crank gear, 1 offset chain link
9 degrees = 1 offset chain link.
Posted: May 18, 2010 09:57 PM