have any of you heard of a turbo using a "foil bearing"??
10-31-2006, 12:24 PM
#1
have any of you heard of a turbo using a "foil bearing"?? hey,
last night, i was talking with some guys that work with APUs... one of them said something about foil bearings, but i didnt know what the hell he was talking about.
i just remembered it and looked it up... :
http://en.wikipedia.org/wiki/Foil_bearing
seems interesting, and ideally suited for a race turbo setup... id imagine it has alot less drag then a traditional hydraulic bearing or even a ball bearing....
now on a street car, id imagine the start/stop would kill it quickly... but on a application like a industrial diesel that runs constantly, it might last a very very long time.
last night, i was talking with some guys that work with APUs... one of them said something about foil bearings, but i didnt know what the hell he was talking about.
i just remembered it and looked it up... :
http://en.wikipedia.org/wiki/Foil_bearing
seems interesting, and ideally suited for a race turbo setup... id imagine it has alot less drag then a traditional hydraulic bearing or even a ball bearing....
now on a street car, id imagine the start/stop would kill it quickly... but on a application like a industrial diesel that runs constantly, it might last a very very long time.
10-31-2006, 12:52 PM
#2
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IMO its really meant for things that run at elevated rpm levels for long periods. Like you said an autmotive turbo..or even a diesel turbo would have too much mid range and low range rpm operation.
An APU or turbine engine...once started...generally operate at 75% to 98% rpm. APUs are generally at 100% rpm once started.
But for an all out race application with 6 second blasts...it may have small advantages. They have the budget to rebuild them often as well.
An APU or turbine engine...once started...generally operate at 75% to 98% rpm. APUs are generally at 100% rpm once started.
But for an all out race application with 6 second blasts...it may have small advantages. They have the budget to rebuild them often as well.
