Hi Gang.
Need some math help.
I've got a motor with an aftermarket crank button on it and no timing tab....
crank stroke is 48.7mm I need to find out how far down the piston top is at 20deg BTDC and 40 deg btdc I don't know rod length either.
Anyone know the formulas?
thanks 44
Difference in rod journal height would be:
20° = 1.4685mm
40° = 5.6968mm
I'm not sure what impact rod length would have on these measurements, if any.
darn close I found the formula in my 2 stroke notes from days gone by.... T= L+Rx(1-cosA)- square root of L^2-(RxSinA)^2
where A= angle in deg L= con rod length (strokex2 if unknown) R=stroke / 2
i came up with 20 deg = 1.4834 and 40 = 5.7485
Thanks 44
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