Date: Tue, 08 Sep 1998 14:35:46 -0400 From: Otto Smith <ottosnopsamtc.faa.gov> Subject: Re: Saab stereo
1. If you have a 900S, you do not have a Turbo, so don't worry about it. 2. Assuming your 900T is pretty much stock, what is running is the electric fan. This will provide some cooling to the radiator/engine compartment. But as far as this being of any benefit to turbo bearings, forget it! The oil stops moving across the turbo bearings when you shut off the engine, which stops the oil pump. If the turbo is too hot at this point, the oil at the turbo bearings will break down. Thus the bearings are not properly lubricated as they spin down. Also, more damage will be done when you start the motor again, since you've burned off the little bit of oil which would have been on the bearings. 3. To really add insult to injury, rev the engine as you start it! Remember that it takes time for the oil to be pumped through the system. Susen Wang wrote: > >I did read something about idling the car for 30 seconds or so before > > shutting down the engine to cool off the turbo bearings. > > After I turn off my SAAB 900S and take out the key, there is still > something running for about 30 seconds. I guess that is the cooling system > working to cool off the turbo bearings. This means that the car will do the > cooling automatically, even if we turn off the engine too soon.
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