Saw somebody I knew at a tractor pull. I didn't know he pulled. The next week he came into work and I had to talk about the tractor. He has a Allis Chalmers D21 diesel. Man it was so neat hearing that thing spool up. When they drive it up to the line they keep spraying ether in the turbos to keep it running. He told me at roughly 2,000 rpm it starts making enough boost to keep running on its own fuel. Okay it has 4 turbos and to me that didn't make sense on a 6 cylinder. He explained first 2 paralleled turbo put out 75 pounds of boost into 3rd turbo and jumps the boost to 150 pounds and 4th turbo puts out 300 pounds of boost. That tractor started life at 100HP and now is roughly 3,000HP. I asked how expensive is all that HP. He rattled off all kinds of numbers for the various goodies. The one that got my attention. The head $200,000.00. He said that is what makes it all work.
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2-1811's
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2072
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