bobc1
Senior Heliman
Location: Southern California
My Posts This: Topic Forum | The cause could certainly be the orings being overcompressed. I agree 100% with Augusto that the hard plastic bearings are a sliding fit both around the T Bushings and into the plastic head dampers bosses. However:
If the T Bushings were too short or if the hard plastic dampers were too long, it would over compress the orings & force the head bosses outward.
If you calculate the forces involved, just 5 ft lbs (60 in lbs) of torque on the 4mm (.7mm thread pitch) through bolts would produce 13,000 to 14,000 lbs of force/thrust on the bushings against the orings (if the dimensions were incorrect). The surface area of the orings is less than .5 square inches. This could produce over 27,000 PSI which is probably more that the plastic head could take.
This seems to have deteriorated into a P***ing match when my intent was to resolve the problem & move on. Obviously, I have been completely satisfied with the CX damper systems in the past to have purchased a third set.
The features that I like about the CX system is their longevity & the through bolt/lock nut system to avoid having to fight with locktite removal to install new dampers.
Jeff G. advises that the newest Hirobo dampers last 20 gallons with no problems. Now that I have drilled out my center hub to accept the CX dampers, I suppose I could use the Hirobo dampers with a through bolt system, in the worst scenario.
On the plus side, Augusto had his factory send me another set of dampers, last night after my post. I will be able to compare these to the ones that cracked the head.
He was also nice enough to provide a phone number to discuss the issue which I plan to utilize.
I assisted with the assembly of an Avant from CX several months ago & was very impressed with the quality and detail of the engineering & machine work. I did not begin this thread as a CX bashing forum. |
