Why do tractors have a projecting exhaust pipes?

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Several reasons. One is because diesel engines produce more Poly-Aromatic Hydrocarbons or PAH's. These are large black molecules and make up the black soot you see from a diesel exhaust stack. This is put up into the air to get it away from crops (if in a tractor on a field) or window level (if on a truck) where it will become obnoxious to nearby motorists.

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Another reason is to direct the loud diesel sound upwards where it will be quieter than if it were pointing at the ground and reverberating.

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Lastly, in the case of tractors, the veritical hood exhaust is short, easy to service and inexpensive. These are usually capped with a pressure operated tilting lid to prevent rain from running into the exhaust system when the tractor is stopped.

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In the case of trucks, the veritical exhaust allows the use of larger mufflers which wouldn't fit as well under the truck.

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so that the exhaust will not be sucked in by the cab, the air cleaner, or get all over the trailer.

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