Amazing facts about turbos

The average temperature of the exhaust gas, at the entry point to a diesel turbo, is 800 degrees centigrade. A petrol engine can reach 1,000 degrees, glowing bright yellow. Hot enough to melt window glass.
	New generation turbo's impellers rotate at up to 220,000 revs per minute. The impellers on a Boeing 747 engine rotate at about 7,000 revs in comparison.
The air entering a turbo's compressor impeller can be travelling at a speed close to mach 1.
	At average engine revs, a medium size turbo will swallow 130 cubic feet of air per minute, equivalent to the interior volume of a transit van.
Turbo shaft balance is crucial - imbalance at maximum revs equivalent to a 2 kilogram force is acceptable. Turbo Technics often finds turbos supplied for service with 6 kilos of imbalance. This is equivalent to driving along with a brick attached to your wheel rim.
	The "hot end" turbine blades in a turbo, are made from a high nickel content alloy, as used in jet aircraft engines. A blade will travel in the region of 820 mph at average engine speed, and the exhaust gas entering it will be supersonic.
A turbo will accelerate from 20,000 revs per minute to over 150,000 revs per minute in less that one second.
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