Re: Turbo Cool-Down time? - Saab 9000 Bulletin Board - Saabnet.com
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Re: Turbo Cool-Down time?
Posted by StevO (more from StevO) on Mon, 15 Mar 2004 17:25:38
In Reply to: Turbo Cool-Down time?, PGAero 
[Profile/Gallery]
, Mon, 15 Mar 2004 16:21:59
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The tradition began in the before time, before there were water cooled turbos. So yes, now we have water AND oil cooled turbos, just like the rest of the engine. I'm not a turbo expert, but when you're not under load (idling and/or coasting) the turbine shouldn't be spinning, or only very slowly, as the compressor isn't exposed to the pumping exh gasses full-time. So the cooling benefits are twofold, at least. Much reduced super hot exh gasses, and oil and water circulating, which are both also going to be getting cooler, because you're not under load. The primary reason is to avoid cooking the oil that stays in the housing after a hot shut down, and ending up with carbon in your housing, which will shorten your bearing life. Yes, oils are a lot better than they were 20 years ago, which is a great thing, but the point is still to avoid running it hard and putting it away hot and wet, so a brief idle time is a good thing.
I always used to coast to my parking space, too! Now I have to ease up the driveway and into the garage, ahh the price of progress.
posted by 69.136.11...
Posts in this Thread:
- Turbo Cool-Down time?, PGAero , Mon, 15 Mar 2004 16:21:59
- Re: Turbo Cool-Down time?, TML
, Tue, 16 Mar 2004 07:42:49 - Yet one more opinion, Ari
, Tue, 16 Mar 2004 05:26:11 - The reason is..., Street, Mon, 15 Mar 2004 23:32:16
- Re: Turbo Cool-Down time?, Willy, Mon, 15 Mar 2004 22:15:17
- Re: Turbo Cool-Down time?, Dick in Falls Church, Mon, 15 Mar 2004 17:58:49
- Re: Turbo Cool-Down time?, StevO, Mon, 15 Mar 2004 17:25:38 <-- Viewing This Message
- Oil does not cool down your turbo but the water coolant, Daren, Mon, 15 Mar 2004 16:59:28
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