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Basically when you have a turbo spinning at very high revolutions the bearings need lubricating.
Turbo's can take a while to spin-down.
When the engine is running, its flowing oil round the turbo, so its being constantly lubricated.
When the engines turned off, the oil stops flowing through the turbo.
If you have just been on boost before the engine is turned off, then the turbo will still be spinning but no fresh oil getting to it, thus oil becoming too hot and looses its properties.
This causes more friction, can wreck turbo bearings and oil seals.
Therefore its always a good idea to keep the engine running just after you've had a spirited drive to allow the turbo to be properly lubricated whilst it spins down.
Turbo's can take a while to spin-down.
When the engine is running, its flowing oil round the turbo, so its being constantly lubricated.
When the engines turned off, the oil stops flowing through the turbo.
If you have just been on boost before the engine is turned off, then the turbo will still be spinning but no fresh oil getting to it, thus oil becoming too hot and looses its properties.
This causes more friction, can wreck turbo bearings and oil seals.
Therefore its always a good idea to keep the engine running just after you've had a spirited drive to allow the turbo to be properly lubricated whilst it spins down.
AlexGSi2000 wrote
Basically when you have a turbo spinning at very high revolutions the bearings need lubricating.
Turbo's can take a while to spin-down.
When the engines turned off, the oil stops flowing through the turbo.
If you have just been on boost before the engine is turned off, then the turbo will still be spinning but no fresh oil getting to it, thus oil becoming too hot and looses its properties.
This causes more friction, can wreck turbo bearings and oil seals.
Codswallop.
The turbo stops spinning right away, there is no gas flow to drive it. However, if you've been driving hard right up to switch-off, the turbo will be very hot, and once the oil stops flowing, the film of oil in the plain bearing will cook and carbonise. Next start-up will be rough on the bearing and the seals (which could be dry, or nearly so) and the carbon deposit doesn't come off easily.
Therefore its always a good idea to keep the engine running just after you've had a spirited drive to allow the turbo to be properly lubricated whilst it spins down.
That's good advice (apart from the spin down nonsense, while the engine's running the turbo will always be spinning, driven by the exhaust gas), better to take the last few miles gently though and allow the whole engine time to cool down.
Basically when you have a turbo spinning at very high revolutions the bearings need lubricating.
Turbo's can take a while to spin-down.
When the engines turned off, the oil stops flowing through the turbo.
If you have just been on boost before the engine is turned off, then the turbo will still be spinning but no fresh oil getting to it, thus oil becoming too hot and looses its properties.
This causes more friction, can wreck turbo bearings and oil seals.
Codswallop.
The turbo stops spinning right away, there is no gas flow to drive it. However, if you've been driving hard right up to switch-off, the turbo will be very hot, and once the oil stops flowing, the film of oil in the plain bearing will cook and carbonise. Next start-up will be rough on the bearing and the seals (which could be dry, or nearly so) and the carbon deposit doesn't come off easily.
Therefore its always a good idea to keep the engine running just after you've had a spirited drive to allow the turbo to be properly lubricated whilst it spins down.
That's good advice (apart from the spin down nonsense, while the engine's running the turbo will always be spinning, driven by the exhaust gas), better to take the last few miles gently though and allow the whole engine time to cool down.
The other day after driving very spiritedly i decided to look at my turbo and it was white hot, i let it cool down loads, but is there anything i should consider after this event ?
Leave off the sauce, it's making you see things.
Red hot, between 500 and 800 °C
White hot, above 1200 °C
http://www.tempil.com/PDF/Basic_Guide.pdf
http://911research.wtc7.net/cache/wtc/analysis/fires/metcolor.htm
Typical exhaust gas temperature in most turbo petrol cars is 850 - 950 °C. Diesels are much cooler, 700 °C and below.
http://www.tricktuners.com/egt_explained.htm
The EGT Sensor in the LCR cuts in at 950 °C
Red hot, between 500 and 800 °C
White hot, above 1200 °C
http://www.tempil.com/PDF/Basic_Guide.pdf
http://911research.wtc7.net/cache/wtc/analysis/fires/metcolor.htm
Typical exhaust gas temperature in most turbo petrol cars is 850 - 950 °C. Diesels are much cooler, 700 °C and below.
http://www.tricktuners.com/egt_explained.htm
The EGT Sensor in the LCR cuts in at 950 °C
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