Join Date: May 2007
Location: Stuart FL
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Minimum amount of compression to fire a diesel
Anyone have a formula for figuring the minimum amount of compression to make a diesel fire? My volvo md7b won't fire up and I have had the injectors tested and they came out ok. After trying for the last few weeks to get it compression tested I have given up and ordered a tester so that should be here next week. I have gotten some vague numbers from other people saying that it should fire with 250psi. The manual does not give a minimum but it does say the starter speed compression should be 284 to 355psi. I am not real optimistic that I will get that given the engines age.
Alternately if someone had a formula for the temperature gained by compressing a given volume of air to a certain psi I could get a semi decent number based on the autoignition temp of diesel of 410 F.
Really all I want is a number so that when I get a reading I know if its reasonable. If its a reasonable number I will look at the fuel pump. If its not reasonable then I will have to pull the head off and look further.
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