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Old May 22nd, 2020, 04:38   #16
IndigoBlueWagon
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That page shows and describes (I think) a traditional wastegate turbo. Not variable vane, which have a different design and components, I believe.
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Old May 22nd, 2020, 14:39   #17
Beaker80
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Whether it's a waste-gated turbo or a VNT doesn't matter. The shaft runs on axial and radial bearings. Here's a VNT rebuild video from YouTube for a VNT that has one large radial bearing and an axial bearing;

https://www.youtube.com/watch?v=OwpS-0MRltM
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Old May 23rd, 2020, 00:04   #18
fatmobile
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I've been putting VNT-15s in Rabbits for a few years.
I get my turbos balanced by gpop shop.
Sometimes they sell me a compressor wheel too.
Then they send the spinning parts back and I put them back together.
They sell the rebuild kits with the bearings too but
I didn't like the "cylinder" bearings because there wasn't much surface area in contact with the shaft.
So I started making my own.


The one on the left is a factory bearing.
Notice how the area the shaft rides on (inside)
is larger than the area of the one on the right?
They removed a bunch of contact area from the new bearing.

I didn't see any reason to remove metal so I make a bearing that doesn't step down and away from the shaft at all.
Runs the same diameter the whole way.
The shaft steps down and away from the bearing.
It has two 5/16" wide sections that touch the bearing,
or technically the film of oil that runs over the bearing.

The new bearings also felt loose in the housing.
Slide the shaft in and much of the the side-to-side movement was the bearing moving inside the housing.
So I added a couple thous to the outside of the bearing.

The center bearing in the picture is one I practiced on.
Got the outside dimension wrong so I used it to practice hole drilling and stuff.
Notice the holes aren't lined up right?
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