| Your paragraph states that if the added spring pressure were to be causing more bite in the anti-lash it would result in a progressively increasing amount of torque needed. That would be an incorrect assumption - all it would reflect is that the torque needed will be higher than if it weren't biting as hard (creating more friction), not progressively (exponentially) higher.
Good way to understand my point is that since the setup already has friction caused by the anti-lash system, according to your logic, we should see a progressive rate in your plot to begin with, but we dont - your plot is linear. Do you have a plot for both the required torque for both the OEM VTC and your own? One other question as well: I just tried to measure the amount of torque needed to make the camshaft turn in the VTC sprocket. I am seeing around 25ft/lbs of force to do so, but it is incredibly difficult to get an accurate measurement because of that anti-lash creating so much friction that you have to kindof "pop" the torque arm to get the helix to let loose and allow the cam to turn. I dont see how you can come up with a real accurate measurement because of this. I preloaded the cam with varying amounts of torque and have to hit the cam with a little force to pop the anti-lash loose and get the cam to turn. I put 35lbs of weight on a wrench at a radial disatance of 8" from the cam center. Any less and the cam wouldn't turn to the piston to its stop - it would only travel partially. What this is really telling me is that it takes a considerable amount of additional torque just to "break" the piston anti-lash loose at all so that the cam can rotate. In fact, I just maxed out my 100lbs scale trying to rotate the cam and it wouldn't budge until I impacted the wrench to apply a little shock to the piston helix so that the anti-lash setup would let go just enough for the piston helix to screw to its stop. I will try in the next few days to put together that test rig I emailed you about so that I can actually measure if the cams are overrotating at any point in my engine and get back with my findings. Do you mind elaborating on how you went about collecting the data for that plot you have? Also, can you please provide a plot for both the OEM and your upgraded cams? You dont have to put the units in there, I just want to see what the slope of the two look like in comparison to each other.
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