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Post by Akµmi on Jul 25, 2006 0:21:02 GMT 7
1.Whistling noise on acceleration. Turbo imbalance or air leak.
2.Rubbing noise on acceleration. Turbo bearings badly worn.
3.Poor performance. Low boost caused by defective turbo, wastegate mechanism or air leak.
4.Too much performance. Over boost may be due to an incorrectly adjusted or defective wastegate.
5.Hesitation - violent. This condition can be experienced when accelerating hard. The boost pressure exceeds a nominal value, leading to over boost (a safety cut out switch). The problem may be caused by a defective wastegate.
6.Hesitation - holding back. Engine mixture weak, or air restriction.
7.Pinking or detonation under load. Incorrect ignition setting, poor quality fuel, excessive boost pressure or a poorly maintained engine.
8.Blue smoke under hard acceleration. Engine wear or defective breather system.
9.Blue smoke under deceleration. Engine wear.
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Post by Akµmi on Jul 25, 2006 0:21:36 GMT 7
Do you know???
The average temperature of the exhaust gas, at the entry point to a diesel turbo, is 800 degrees centigrade. A petrol engine can reach 1000 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.
NOW YOU KNOW!!!
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