Journal Bearing vs Ball Bearing
03-28-2008, 10:13 AM
#1
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Journal Bearing vs Ball Bearing
I am a bit confused. So journal bearing turbos have only one bearing in a grove while ball bearing turbos have packed bearings surrounding a shaft?
Why don't turbos just use the same type of bearings that engines use? Which aren't really bearings at all, the crank and rods are separated by a film of oil.
Why don't turbos just use the same type of bearings that engines use? Which aren't really bearings at all, the crank and rods are separated by a film of oil.
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03-28-2008, 10:26 AM
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BB turbos spin for about 37 minutes after you shut the car off, journal bearings...maybe .5sec.
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03-28-2008, 10:27 AM
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I am a bit confused. So journal bearing turbos have only one bearing in a grove while ball bearing turbos have packed bearings surrounding a shaft?
Why don't turbos just use the same type of bearings that engines use? Which aren't really bearings at all, the crank and rods are separated by a film of oil.
Why don't turbos just use the same type of bearings that engines use? Which aren't really bearings at all, the crank and rods are separated by a film of oil.
A bearing is a device to permit constrained relative motion between two parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as well as by the directions of applied loads they can handle.
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03-28-2008, 10:33 AM
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Well that clears everything up.
Thanks Pat, Fluid Bearings explains everything as well.
I was confused this whole time.
This also explains why oil pressure is so important to journal bearing turbos.
You guys are great.
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03-28-2008, 08:58 PM
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Mark
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