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Tractor Talk Discussion Forum

Re: Compression Question

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RJ Miller

02-01-2004 14:23:32




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It makes no sense to judge the power or performance of an engine by how easily it starts. The only real way is to take comprssion readings and compare the difference to each cylinder, also know as a percentage of drop. Rule of thumb is anything over 125psi for gas with a varience of 22psi to the weakest cylinder...Does that help?




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Scottf

02-02-2004 07:06:34




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 Re: Re: Compression Question in reply to RJ Miller, 02-01-2004 14:23:32  
Maybe you were thinking of a gas engine. Judging the compression of a Diesel engine based on how it starts at different temperatures is fairly easy and quit accurate with a little experience. There is a direct relation to how well a diesel engine starts and compression. Obviously, since a diesel engine uses compression to ignite the fuel. And heat. Of course, if it does not start well it there could be something else wrong. But a diesel will not pop off cold with low compression. So you can tell, by the way a Diesel engine starts if the compression is good but necessarily if it is bad.

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