Hey guys..


Its easy to find out that the proper chemically correct ratio for gas is about 14.7:1


But I dont see any such numbers for diesels.. I know lean burn can cause this number to change but is there a ballpark range??


Thanks


ram

A diesel does not care about A/F ratio the same way a gasser does. When you are idling, you are probably 100:1, when you are "overfueled" with race boxes it's probably 10:1.


Perfect ratio? There isn't one. It's a balance between economy and performance.

A diesel does not have a throttle plate. So if you don't have a turbo, you are getting roughly the same amount of air in the motor at all times, and the power is a function of how much fuel is sprayed. With a turbo, you get more air in when it's on boost, but the same rule applies.

McRat summed it up perfectly!


Bill

Also note that a diesel only can utilize approximately 80% of the available air. A diesel needs 20 % excess air to burn all of the available fuel depending on how much is sprayed of course. This I believe is the only drawback to a diesels efficiency, if you want to call it that!!http://www.dieselplace.com/forum/smileys/Geek.gif


J

Well said boys. It's really hard to put the fire out with air in a diesel unless you spray a rediculous amout of N2O in to it. How ever you can over fuel to the point of hydro lockhttp://www.dieselplace.com/forum/smileys/Dead.gif. Generaly if you have alot of black smoke, you don't have enough air. If no smoke, you can turn up the fuel. There is limits though.