An Answer a common mechanic can understand is how violent the exhaust gas is exiting the combustion chamber. If you have the wind pickup on a grass fire look how much harder and violent it will burn. When you push more air and fuel into the intake the harder it will exit into the turbine. If it was heat, then explain how you can have lets say 30 pounds of boost and 1100 degrees on the pie gauge. Pull back on the fuel and the boost will drop to 0 while the pie will slowly drop from 1100. Throw on a jake brake and the pie gauge will drop to 0 almost as fast as you look at the gauge. Now smash the pedal and you will see the boost go back to 30 and the pie will start to climb, but not instantaneously. Nothing to do with how much heat, but how "mad" the gasses are leaving the heads. Watch a boost gauge on a day it is 90 degrees verses a day that it is -30. The colder and more dense the air the higher your boost. I have seen head bolts pop the heads off in really cold weather on a juiced up engine if a driver didn't watch his gauges. I have seen many tubos grow cherry red while pulling hard on my dyno. From the time the engine was just warn enough to pull to that point the boost never changed. I have seen guys install a big fancy high dollar turbo on an engine and not get hardly any boost. It takes fuel to make a turbo spin. Example is with a dirty fuel filter. An engine that will build 30 pounds boost any time pulled hard will not make hardly any boost because not enough fuel is being injected. With a dirty air cleaner you will have a very high pie temp. , but hardly any boost. Lots of black smoke and low power. Its not the amount of fuel put in, or the amount of air. Its how much fuel and air together and burning violently that will make a turbo spin. When idling a turbo will have 0 boost. You will here it spinning but it will not make boost. It is just spinning from exhaust being forced threw it. Example, start an engine with the air neck from the tubo taken off. The engine will free rev most times just fine, turbo unable to do anything. Now try to apply a load. You will make lots of smoke, low temps on the pie, but no boost. Takes air/fuel burning to build boost. That why multi turboed pullers take time at the start line to get the engine to come alive. They have to slowly increase the fuel so the turbos can come up to speed to burn the extreme over fuel condition. Fuel and air have to have some balance to make a turbo work. More air, more fuel, more power. Until something finds its weak spot. Not enough air cleaner compassity or maxing out the fuel system delivery. Most times it inability to remove heat from the engine. exhaust ,or liquid coolant.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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