Injector Flow vs Pump Flow
02-09-2015, 03:49 PM
#41
UPDATE 2/9/2015
I got an email from a guy asking about fuel line size effects so I added that part in. If you open the spreadsheet is in the top middle. Basically you look up the max volume of fuel you will flow from the tables below, or type it into one of the quick calculators on the right, to get the flow volume (L/hr). Look on the little AN table size for the different inner diameters of AN hoses. Stock 3/8" fuel line has an ID of 0.310" I believe. Also input the length of the line from the fuel pumps to the rail.
The Fitting section right below that takes into account pressure loss from the fittings you use. A union is any connection point is anywhere there is a fitting. Type in the number of different fitting types you have.
This is based on a standard fluid dynamics type calculation, the only assumption is turbulent flow, but the reynolds number is >30,000 so I think thats a pretty safe one.
To see differences between gas and e85, change cell C8 which is the main one for the spreadsheet. The difference is very small, which is unexpected given how much guys like to say you have to upgrade your fuel lines with e85.
FWIW, -8an hose of 20ft does not have more than a 3psi drop on a typical fuel system until you max out 2000cc/min (192lb/hr) injectors. Stock size 3/8" line only has a 4psi total drop at 1000rwhp.
I got an email from a guy asking about fuel line size effects so I added that part in. If you open the spreadsheet is in the top middle. Basically you look up the max volume of fuel you will flow from the tables below, or type it into one of the quick calculators on the right, to get the flow volume (L/hr). Look on the little AN table size for the different inner diameters of AN hoses. Stock 3/8" fuel line has an ID of 0.310" I believe. Also input the length of the line from the fuel pumps to the rail.
The Fitting section right below that takes into account pressure loss from the fittings you use. A union is any connection point is anywhere there is a fitting. Type in the number of different fitting types you have.
This is based on a standard fluid dynamics type calculation, the only assumption is turbulent flow, but the reynolds number is >30,000 so I think thats a pretty safe one.
To see differences between gas and e85, change cell C8 which is the main one for the spreadsheet. The difference is very small, which is unexpected given how much guys like to say you have to upgrade your fuel lines with e85.
FWIW, -8an hose of 20ft does not have more than a 3psi drop on a typical fuel system until you max out 2000cc/min (192lb/hr) injectors. Stock size 3/8" line only has a 4psi total drop at 1000rwhp.
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