pkincy

iTrader: (1)

What is the pressure at which the SVO injectors are rated?? Ford is funky that way. They do rate some of the injectors (the V6 SC) at 3 bar but most of their injectors are rated from 33 to 40 psi. Can't find info on SVO however.

I do recall several threads from years ago that claimed a 39 psi rating for them which made them flow 32 #/hr (my 30's) at the LT1 fuel pressure. In fact that is how I have them entered in both my 383 LT1s 'puters.

But before I use them in my rebuild I want to know. If they are rated at 3 bar than they flow 40 #/hr at our fuel pressure. If they are rated at 39 psi than they will flow 44 #/hr, which is my goal.

Perry

DrkPhx

iTrader: (15)

I believe they are rated by the 3-bar system (industry standard) which is 43.51 psi.

DrkPhx

iTrader: (15)

A 30-lb injector rated on the 3-bar system (43.51 psi) is rated at 37-lbs on the 4-bar (58.02 psi) LS1 system. I dug up some formulas to calculate injector sizing based on hp which helped alot.

ibjamin

iTrader: (6)

Hi Perry,

I'd be careful about what you hear on this or any other forum. According to this thread:

https://ls1tech.com/forums/pcm-diagnostics-tuning/248272-what-do-i-need-change-put-30lb-injectors.html

and also the conversion program in HP Tuners a 30lb SVO injector is equal to a 34.64# injector at our fuel pressure (4 bar vs. 3 bar). I still don't know how that calculation was made.

George E.

DrkPhx

iTrader: (15)

I pulled those numbers from the book "Chevy LS1/LS6 High Performance" written by Chris Endres. I find it hard to believe he would publish erroneous information.

ibjamin

iTrader: (6)

"I pulled those numbers from the book "Chevy LS1/LS6 High Performance" written by Chris Endres. I find it hard to believe he would publish erroneous information."

I agree. But when I first installed 30# ones in my car I set it for 36.12# which was the number I got from a post on LS1.com quite a while ago. With that # my car was way lean during the tune. Had to bring it down to get the AFR correct.

That's why I asked in that previous thread to see how that calculation is made. It's the one that is used in the conversion formula in HPTuners. I wouldn't think they would have the wrong answer in their tuning software either, but the results do not agree with each other.

George E.

DrkPhx

iTrader: (15)

Thanks for clarifying that.

pkincy

iTrader: (1)

What Endres says is the 30 lb/hr Lucas Green stripe injectors are 34.4 at 4 bar. He also says the Bosch brown tops are 32 at 3 bar and 37 at 4 bar. Both of those are simple algebraic calculations.

What I am asking is what the SVO 30#ers are rated at. And I do not believe the answer is 3 bar. I think it is about 2.7 bar. Ford very seldom rates their injectors at 3 bar. Heck a lot of their injectors (2.3Lturbo) are low impedance. Several of their 30 lb/hr injectors are run and rated at 37 and 39 psi. We can't do the arithmetic until we know the pressure that the 30 #s is run at.

I find http://users.erols.com/srweiss/tableifc.htm very useful. But that may list 100s of injectors but I can't find the SVO part no in it at all.

I do remember clearly that we have a detailed thread on this subject some years ago and it was decided that the test pressure for the flow rate for the SVO series of injectors was at 39 psi. That made them 32 #/hr at 3 bar and that would be 37 #/hr at 4 bar. That is why you will see the LT1Edit initial settings for the SVO 30s is always 32 #/hr cause that is what they flow at 3 bar.

That would give them a 100% duty cycle rating of approx 570 crank hp and 470 crank hp or so at 80% duty cycle in a N/A motor. I got a new set so they are going in my 402 initially, but I expect I will find that I need a bit more injector after the motor is tuned initially and is broken in and I begin to let it out.

Perry