Originally Posted by
onehundred80
I have read about this new pulley with great interest and there are a few questions that I have that I cannot see the answers to.
From what I have read the OEM pulley required different size shims to suit the particular pulley supplied due to manufacturing tolerances of the SC shaft, the clutch and the pulley. So wouldn't the initial pulley fit be better using the shim(s) that the were used with the OEM set up?
Anything made of metal that has a temper has a yielding point that has be be met. When you over stress something past it's yield point, you permanently deform it. Some metals like aluminum will not rebound at all after this point, other metals like spring steel do and it's this process that is what makes everything work with this pulley. If we didn't, it would never meet this yield point and would continue to deform until it met this point. That being said, if you pull this thing an inch apart, you're well past the initial deforming and it will not spring back.
Originally Posted by
onehundred80
If the gap could be greater than 1mm on the initial install and the attraction of the magnet cannot overcome the spring tension and there is slip or no contact what would the effect be on the SC performance for the initial 50 miles?
The pulley is going to slip during the first few miles. The exact number will be different for every car as no one will drive the car exactly the same during the first 50 miles but it was before this point that every pulley tested was where it needed to be and usually with only the 0.33 shim and 50 miles is a good solid number that people will remember.
Originally Posted by
onehundred80
If one can expect that the gap will decrease from greater than 1mm to 0,3mm then the so called springs are not really springs at all as they will have been stressed beyond their elastic limit and will not return to the original position on the plastic stops. That they are not on the stops is no great loss but how many cycles can they be expected to flex after that without getting closer and closer to the clutch? Steel that flexes constantly without the proper heat treatment to give it the properties of a spring will fail sooner than a true spring that is not stretched beyond its limits.
Refer to the first reply above.
Originally Posted by
onehundred80
The use of the spacer indicates that a different bearing to the OEM bearing is being used, if so what are its properties with regard to load and RPM, smaller bearings tend to have higher RPM limits but take less loads. I imagine that a PSK will put more load on a bearing and would reduce the life of the OEM bearing let alone a smaller one. How long can this bearing be expected to last and are they readily available off the shelf.
You are correct in that the bearing is smaller but it's loading characteristics will be the same or better than the original larger one as we are moving it's center of mass farther onto the shaft and as a result, putting the load closer to the point of off-axis loading (where the clutch and clutch plate meet) and that will actually minimize what very little wear the pulley saver kit would add.
Originally Posted by
onehundred80
With what you have said previously the riveting of the springs is being done as it should be, as the riveting process, the tightness of the rivets in their holes and the accuracy of the rivet hole positions is vital to the success of the pulley. The quality of the product is obvious to the eye.
Thank you for your observation. Aside from aesthetics and people's piece of mind, the recess of the rivets pose no increase or benefit over those that were flush like the prototypes but everyone has pointed it out with worry so that part of the design was revised.
Originally Posted by
onehundred80
When you mention the tune is it the Speed Driven tune that is required to get the most from this mod or can those with other tunes just get an update?
My personal preferences are Speedriven and InMotion as I have directly had great success tuning with them both but that is not to say there aren't other competent tuners out there.