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Re: Procedure for adjusting valves on M?


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Posted by captaink on July 22, 2005 at 05:56:58 from (66.115.214.56):

In Reply to: Re: Procedure for adjusting valves on M? posted by Bobg on July 21, 2005 at 20:07:12:

Compression in the way you are referencing it is the amount of pressure that it created by the piston in the combustion chamber when it comes up on the compression stroke. The higher the pressure, the tighter the valves in the head and compression rings on the piston are sealing, which relates to more of the explosion of the fuel being contained and turned into power output.

Another reference to compression is the compression ratio. This is the difference between the volume of the cylinder when the piston is at the bottom of its travel and the volume of the chamber when the piston is at the top of its travel. For a close example in a 282 Diesel engine each cylinder has approximately 70.5 cubic inches of volume with the piston at the bottom of the stroke. If memory serves me correctly, the compression ratio on the engine is 16:1 which would mean that at the top of pistons travel there is only about 4.4 cubic inches of volume. Of course it takes a lot of energy to squeeze air because the pressure inside the cylinder increases dramatically which is necessary in a Diesel engine as this heat is the ignition source for the fuel.

This might be more than you wanted to know, or might raise other questions. Holler on the board if it did and someone here will answer.



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