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Post by rrencher on Jul 16, 2013 15:16:31 GMT -5
Ive read that E85 take 1.5 times more volume vs. gas. With that being said should jetting be 50% higher vs gas for the same carb? example- If my carb had 100 jets squared would I need 150 jets squared with E85?
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Post by Mark Sullens on Jul 17, 2013 12:05:17 GMT -5
NO, the jetting depends on flow....in some cases the engines are more efficient than in other cases and may require less jetting.....here is an example...a 60 jet will flow 285# of fuel under a certain pressure "X" , a 90 jet will equal "X flow" of 1014# so as you see the 90 jet numerically 1.5% larger will flow nearly 350% more fuel. now if we go by orfice size... 60 jet = ..060 , a 90 jet = .104....this is roughly 1.57% bigger than the 60 jet.....but not really, a 60 jet has an area of .002827 sq"....while a 90 jet has an area of .008459.... which is only 33% bigger area.
flow has more to do with just jets, its air bleeds emulsions, and other stuff.
typically we will see a 8-10 jet size spread over gasoline....but in some cases we may be as much as 20 jet sizes bigger....in your case we should be 10-12 larger than gasoline.
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