another potential IMS question...

[cheese]

I have known about micro blue for several years and plan to use their coating. I hear Jake Raby at Flat 6 has some data on micro blue. My question is, where can we find an exact specification for this 6204 bearing. Obviously Porsche is not in the bearing manufacturing business.


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[Jamesp]

Originally Posted by cheese

I have known about micro blue for several years and plan to use their coating. I hear Jake Raby at Flat 6 has some data on micro blue. My question is, where can we find an exact specification for this 6204 bearing. Obviously Porsche is not in the bearing manufacturing business.


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So there really is no exact specification. If you take out the stock bearing and look up the codes on the seals you can determine what Porsche used. Those tend to fail so with a little research you can decide what a more appropriate bearing might be. These cars were built to a price point. The original IMS bearing cost a few bucks. The original purchasers had no idea the bearings even existed. 6204 simply means deep groove ball bearing of a certain size. The rest of the details, such as the quality of the materials, and hoe the bearings are sealed, or not, are left to the user.

[Gelbster]

The full generic part number for the bearing also specifies the seal type.See my previous post.It is a suffix to the 6204 number -like "2RS".
If you are concerned about heat on the seals -per my previous post, specify Viton .
If you use DOF you may consider the whole heat anxiety moot(according to the vendor). Just the one inner Buna seal should be adequate because the oil feed will keep the IMSB cool & lubricated. If the IMSB gets so hot that viton seals are necessary, there are probably other unaddressed issues in the bearing choice?
If you are relying on a grease-filled fully sealed bearing , you certainly need to think about a spec that is 'very high temperature,ventilated seal '.
Otherwise just use the bearing supplied by LN in their kit and skip the bearing-geek discussion?