Re: Turbo cool down

Posted by NC Wayne on March 23, 2006 at 19:20:38 from (152.163.100.74):

In Reply to: Re: Turbo cool down posted by RodInNS on March 23, 2006 at 15:04:37:

Hey Rod, your right, we could probably go back and forth all day. Everyone has their own experiences and that's what they base their beliefs on. That's what I like about these forums, their so full of different experiences their a great learning tool if we all keep an open mind. As for the turbo spinning after shutdown, pull an intake and watch one sometime. The one I was watching I wasn't but a foot or so from it with the intake pipe completely off and I could see it spinning but there wasn't any "noise" associated with it. I had often heard how long they'd spin but always took it for granted til I actually saw it for myself. The guy was wasting so many turbos I was working on a design for a post flow device. As such I needed to know how long the turbo stayed in motion after shutdown so I could properly time the length of flow. It was about that time I finally convinced him to start buying all his grease and oil from LE and so far just changing to the better quality oil has solved the problem so the post flow device went on the back burner.--It sounds like the machines you were dealing with operated similar to what these do. What brand of turbos were they using? The ones I deal with so on these air compressor units much are Switzer and Garrett. For whateve reason the Garrets seem to have a greater life expectancy that the others. ---Let me ask you this regarding what you just posted so I can understand what your saying. You said there is more of a cooling effect at 1250 with no load than 650 with no load due to the increase in flow through the turbo. I can understand this to a degree because most engines with turbos or super chargers have a overlap time to allow the intake air to blow through and fully charge the chamber -vs- having a charge still containing residual gases. This being the case though if you "cooled" the turbo at 1250 and then brought it back to an idle at 650 to spool down for another 2 minutes before shutdown, would this in effect not heat the turbo back up? Not trying to be a smart a--, just trying to understand what your saying.
If you need the best oils and greases on the market try getting them from Lubrication Engineers. Like I said their oil has worked wonders on the life of my customers turbos. We had another who's 3306 CAT we rebuilt last year due to electrolosis eating a hole a liner. The engine had been in service 12 years, in an excavator that was used, on average, 8-10 hours a day digging pit gravel since being rebuilt. When we miked the crank it measured out standard. Dad built engines for CAT in the 70's and early 80's and said he'd never seen one come back standard, at a "normal overhaul intervall" much less after a 12 year run. So, if you need a good extreeme service grease or oil give LE a call, the've probably got what you need.

• Lubrication Engineers

Replies:

• Re: Turbo cool down RodInNS 20:04:54 03/23/06 (0)

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