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21st October 2020, 11:48 | #11 | |
Posted a thing or two
MG ZT Join Date: Dec 2009
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Kev |
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21st October 2020, 14:59 | #12 |
I really should get out more.......
MG ZT-T 260 Join Date: Feb 2016
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A well engineered Turbo engine is not a problem, you only have to see how many Saab's that have done big mileages with little or no trouble and some of those are pushing out big horse power.
The problem is a big turbo on a small engine is putting the cylinder pressures high all the time to give you the performance of a big engine and that with 20k mile oil changes is to much for the poor quality materials that are being used in the construction of these engines. As has been said the cost of the fuel is often peoples biggest concern but in truth unless you are doing 25k or more a year is often less than the depreciation and servicing costs. Driving a V8 car 8 to 10k a year that just about to does 20mpg with little or no depreciation is a cheaper car to run and the engine should last many years due to it being under stressed. |
22nd October 2020, 20:23 | #13 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
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Some folk have the engine revving as they switch off. The turbo could be spinning at around 80,000 rpm.-- As the engine stops the oil flow stops too. The turbo then slows down to a halt with NO OIL PRESSURE. With the engine ticking over for twenty seconds, maybe, the turbo is then spinning very slowly. As the engine stops the turbo is very quick to follow leaving plenty of oil in the bearings for the few seconds it takes for the turbo to stop. In fact the turbo body with no air flow to help cool it will actually get hotter but not hot enough to damage any components. |
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