Another IMS bearing thread

[moresquirt]

James,i think your on to something and obviously Pedro agrees,but how do u make drill those holes without splitting the motor and if it is possible what about the 06 thru 08 models with there bearing installed from inside the case on assembly.Again great info and well documented

[Jamesp]

Originally Posted by moresquirt

James,i think your on to something and obviously Pedro agrees,but how do u make drill those holes without splitting the motor and if it is possible what about the 06 thru 08 models with there bearing installed from inside the case on assembly.Again great info and well documented

I have not looked at the larger bearing, but from what I've seen in passing there is little problem with them in the base, thought some say their reliability can be improved by removing the grease seal and relying on splash or DOF. If I had one of them I'd be tempted to leave it alone. When replacing my IMS I searched a long time to replace it with a shaft using the 6204 bearing so it could be serviced. I'm not sure that was the best choice. As far as drilling the hole with the shaft in the engine, for the removable (6204) bearing, with the bearing removed a very small 90 degree drill bit drive with a predetermined set back would need to be built. Not impossible, but not easy either. Milwaukee makes one commercially that is close, but I think it would be custom tooling to drill from the inside of the shaft.

[pjq]

James P, your theory seems to be based on the pressure difference that can occur within the tube, why does the simple solution of removing the IMS bearing grease seals non't address this issue?

[Jamesp]

Originally Posted by pjq

James P, your theory seems to be based on the pressure difference that can occur within the tube, why does the simple solution of removing the IMS bearing grease seals non't address this issue?

The lubrication properties of oil and grease are completely different. Splash oil on an open 6204 steel bearing would be dicey at best. The same bearing with grease is fine. The trick is keeping the grease in the bearing.

[southernstar]

Tony, I remember the cars. The Boxster is, of course, much more refined, has much better handling, creates a much better exhaust note, has a much better top, is better assembled and does not have the inevitable rattles of fiberglass on a steel chassis. Cool car though.

Brad

[tonysilver986]

All the above reasons is why I changed to a boxster, apart from one important one, the exhaust noise.
Nothing can compare to the noise of an almost straight through exhaust connected to a thundering V8 lump. The pops and bangs on the overrun is awesome. That's the only thing I miss about the TVR.

So far I have fitted a double din touchscreen cd/rad/satnav/dvd player, sports back box with sports headers ready to go on soon. New discs/pads and clear rear lights which I really like

[recycledsixtie]

Originally Posted by tonysilver986

All the above reasons is why I changed to a boxster, apart from one important one, the exhaust noise.
Nothing can compare to the noise of an almost straight through exhaust connected to a thundering V8 lump. The pops and bangs on the overrun is awesome. That's the only thing I miss about the TVR.

So far I have fitted a double din touchscreen cd/rad/satnav/dvd player, sports back box with sports headers ready to go on soon. New discs/pads and clear rear lights which I really like

I have sent you a pm.

[Walter White]

I am liking this setup.




I may have shown too many holes, but it illustrates various routes that may be possible to collect drain-off.

[Jake Raby]

It would be nice if you could miracle those passageways into place.

I don't concur with this logic about removing oil from the area any more than delivering oil to the area and keeping a ball bearing in place.

How do you foresee testing this theory? Do you realize how long it will take to gather trend data that supports if it works or if it doesn't?

Ever taken apart an M96?

[Walter White]

I was just figuring out the minimum and maximum pressure the IM shaft would see if it were sealed with a freeze plug. Using P1/T1 = P2/T2, volume is not a variable. So that would mean that if the bearing is sealed with its own seals, it would see the same changes in pressure over temperature? Venting the shaft would not help? The grease in the sealed bearing will still see the same pressure changes I think.

[Nine8Six]

That is one of many other calculators that we often use for some applications we engineer.

http://www.skf.com/group/knowledge-centre/engineering-tools/skfbearingcalculator.html

Of course Porsche's R&D have designed better formulas, but it could give you a head start selecting a, perhaps?, better bearing than what Porsche initially came us with.

Bearing life, frictional moment, frequencies, viscosity, dynamic bearing load, etc etc...

[Walter White]

Originally Posted by Walter White

I was just figuring out the minimum and maximum pressure the IM shaft would see if it were sealed with a freeze plug. Using P1/T1 = P2/T2, volume is not a variable. So that would mean that if the bearing is sealed with its own seals, it would see the same changes in pressure over temperature? Venting the shaft would not help? The grease in the sealed bearing will still see the same pressure changes I think.

I have been spin-testing my bearing with the supplemental seal and it spits out a little grease each time I start spinning it after a cool down period. I have a feeling my prediction may be correct. It may be that using grease will require some type of ventilation.