Pedros Techno DOF IMS fix?

[Kirk]

Originally Posted by Jamesp

Kirk,

I'm not trying to design anything to sell. I'm just looking for an IMS redesign that provides adequate bearing life and addresses the root cause of the bearing lubrication failure. Your 20% discussion points to inadequate design by Porsche. Doing the calc on the existing bearing answers the L10 question.

I am with you. Okay, I think I will do some calculations this next week too. We know the load ratings for the NSK stock bearing. I posted on Pelican Parts a link to the SKF bearing calculator that makes it easy to get an L10 calc. This assumes that the inner race is moving though. I suspect you can just multiply the results by 0.8 to get an answer for the outer race rotating.

SKF Bearing Calculator

You can use the numbers from the stock bearing to compare to other options. I believe I have seen LN post their ceramic bearing load figures in a forum post. You will have to "assume" a certain level of radial and axial loads. Thus you won't get a definitive answer, but you will get calculations that you can use to compare the options available.

The one variable I don't know is what TuneRS is using for their ceramic bearing. What is the load capacity of that option? Does it use a nylon cage? I plan to call Mike at TuneRS next week to ask these questions and add it to the mix for comparison. I want to include them because, although I am still investigating, my gut feel right now is that the TuneRS DOF with ceramic bearing is the best "bang for buck" option that I can install myself in my own shop. If the radial load rating of their bearing is good and you've got consistent oil feed, then it seems that this solution would address the major failings of the stock bearing.

Kirk Bristol