Some of these have a throttle plate for air control, and others just control the boost to maintain air fuel ratio. The turbo's use compressed air to spool them up and provide boost until they are working.
We sometimes retard the timing about 10 degrees to get enough heat in the turbo to provide boost so there is enough air. The engines will detonate under these rich conditions of too little boost. Once the engine is working, there is plenty of energy to spin the turbos. It is a balancing act to get the engine to produce enough torque to load up with the timing that slow so it can produce its own boost, then you can advance the timing.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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