Bleh wrote:Well that was a busy few days...
Good to see plenty of posts providing food or thought... Some of the observations I have already witnessed, such as oil pouring from the rear CCT when loosening the bolt off at the back, and others I hadn't considered until just now like Sirch's observation where the two CCT's behave in an opposite manner, i.e. when accelerating, the front slackens off and the rear tightens up - also makes sense when you think about it as the crank rotates the same way always. With this in mind, the rear CCT presses against the rear of the cam chain and the front CCT presses against the front of the cam chain, but under load, it will always be the same side of the cam chain that is under tension due to the direction of crank rotation.
That leads on to a new branch of questions such as 'What's the tolerance for the allowable movement within the tensioner?'.
What else would be interesting to know is if anyone has set up a rig, such as a vice, where a CCT has been placed between the jaws, and then clamped tight with a torque wrench until some movement is witnessed in the CCT for an 'approximate' linear spring rate? I have 2 problems with trying to do this.... No vice and no torque wrench!
Also, I'm having a mare trying to get the actual torsional modulus for the spring used. Without knowing the exact material, it's a real pig trying to work out. And trying to establish all the forces from combustion transferred to relevant components, including frictional forces, bladdah bladdah bladdah, to eventually establish the 'ideal' spring rate is a whole lot of another type of work and not really time worthy for the type of assignment I'm currently doing.
I do have some spring formulas which I wanted to eventually incorporate and will eventually share, but they are more for the ideal linear function rather than it's torsional function - and it's this torsional function that may be a) the necessity and, b) the actual downfall of the CCT.
Does anyone have experience of a linear springed CCT that have either failed or work so much better than these?
Both cylinders have the tensioner to the rear of the cylinder, they both act identically.
