when do you NEED to seperate fuel rail feed / return lines?
08-02-2011, 09:28 PM
#1
when do you NEED to seperate fuel rail feed / return lines? what is the main reason to y into each rail and y out to the return line?
because with crossover system the last injector in line runs lean?
if so - what source of data tells you this is happening?
if air /fuel is good, car runs good and fuel pressure is good - would splitting the fuel rails be a waste of money?
because with crossover system the last injector in line runs lean?
if so - what source of data tells you this is happening?
if air /fuel is good, car runs good and fuel pressure is good - would splitting the fuel rails be a waste of money?
08-03-2011, 12:13 AM
#2
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im interested in knowing this as well. sorry to hijack your thread but im about to lol.
instead of
pump - Y - rails - Y - regulator - return
can you do
pump - regulator - 1 line to each rail - port plug on the end of each rail. this just lessens the amount of fittings and clutter and price of the system, but do the last injectors in each rail go lean?
what if you..
pump - regulator - 1 line to each rail - connect the rear of the rails together..
instead of
pump - Y - rails - Y - regulator - return
can you do
pump - regulator - 1 line to each rail - port plug on the end of each rail. this just lessens the amount of fittings and clutter and price of the system, but do the last injectors in each rail go lean?
what if you..
pump - regulator - 1 line to each rail - connect the rear of the rails together..
08-03-2011, 12:21 AM
#3
im interested in knowing this as well. sorry to hijack your thread but im about to lol.
instead of
pump - Y - rails - Y - regulator - return
can you do
pump - regulator - 1 line to each rail - port plug on the end of each rail. this just lessens the amount of fittings and clutter and price of the system, but do the last injectors in each rail go lean?
what if you..
pump - regulator - 1 line to each rail - connect the rear of the rails together..
instead of
pump - Y - rails - Y - regulator - return
can you do
pump - regulator - 1 line to each rail - port plug on the end of each rail. this just lessens the amount of fittings and clutter and price of the system, but do the last injectors in each rail go lean?
what if you..
pump - regulator - 1 line to each rail - connect the rear of the rails together..
Your design is for a system without a return line, like an old Holley carb.
08-03-2011, 09:14 AM
#4
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no, aeromotive 13113
it has 5 "inlets" , these also feed the rails...
and 1 bottom outlet. it doesnt matter where the pump feed line goes (rails first or regulator first) everything on that side of the system will be at whatever specified psi.
it has 5 "inlets" , these also feed the rails...
and 1 bottom outlet. it doesnt matter where the pump feed line goes (rails first or regulator first) everything on that side of the system will be at whatever specified psi.
08-07-2011, 03:19 PM
#7
I'm going to go with my gut here and say:
If the car does not lean out and the injector duty cycle is within range - the fuel supply is sufficient.
having the supply to injectors 'balanced' certainly seems like a good idea, I think the 'need' for it would be fuel loss at injectors furthest from the inlet line or on the 2nd fed rail.
at the cost it takes to do this nicely, I'll stick with the stock set up until my engine tells me it needs something more.
If the car does not lean out and the injector duty cycle is within range - the fuel supply is sufficient.
having the supply to injectors 'balanced' certainly seems like a good idea, I think the 'need' for it would be fuel loss at injectors furthest from the inlet line or on the 2nd fed rail.
at the cost it takes to do this nicely, I'll stick with the stock set up until my engine tells me it needs something more.
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08-08-2011, 12:33 AM
#8
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Assuming your talking about an LT1 engine here. You are essentially correct as long as you have adequate volume and pressure across the injectors there is no need to change to a parallel rail setup. If you notice the left bank running lean no matter how much fuel the PCM is demanding then you should look into making the change.
As far as cost goes upgrading the rails isn't too bad if you keep the stock fuel lines under the car. It's when you start replacing all of the fuel system that the cost skyrockets. Some of those stupid fittings are $20+ a piece.
As far as cost goes upgrading the rails isn't too bad if you keep the stock fuel lines under the car. It's when you start replacing all of the fuel system that the cost skyrockets. Some of those stupid fittings are $20+ a piece.
