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ball bearing turbos


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I have just IHI BB turbo but I know that also Garrets are used without water cooling. Yes, there is some risk for bearing failure as most of the BB turbos use plastic ball holders on bearings. But if you have the turbo on front of the engine or some other place with good air flow and take care of proper oil supply it should be fine.

When I was building my current turbo setup I had some plans to route oil cooler flow through water passages of the chra. But plumbing started to look too tricky so I gave up the idea.   

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