the middle, because thats were the 2 would combine and push back so open it up and put a line in there and have it go into on of the lines or back to the tank or t-bone to both lines so they bothj can use wut ever.

and isnt it kinda funny that, on this site were the only ones thats posting and talking about this. i thought ppl would show more intrest in saving there motor.

 

yeah true, but i would have to get another fuel rail to do so, i dont wanna mess mine up, i rather mess up another and jsut incase still have mine on hand, but i will ask my uncle what i can do, and btw i always thought cylinder 4 was all the way on the left, looking a thte motor its actually on the right haha, so i just fixed myself

 

lol, yea.because if u think about the v-6's and v-8's are straight back and forward. with the pulleys in the front, and our pulleys are to the left so that would swing the rear #4 to the right.

 

Thats because there is already a thread regarding fuel system:
https://www.cobaltss.net/forums/general-cobalt-68/wanted-address-some-things-about-your-fuel-system-fuel-distribution-53780/

 

oh i c well damn it.

 

Hey guys Im trying to figure out what to do also. I got the car back and took it to the tuner. Got the A/F to a perfect flat line between 11.2-11.0:1.. .Anyway only 12 degrees of timing because we couldnt get the water meth to work for some odd ass reason. Well we made about 260whp only going up to 6k rpms. on the 7th or 8th pull we thought the headgasket blew. I was like hell no the head gasket was custom made from Cometic and was supposed to hold up to 800whp. Anyway we took the head off and found out that cylinder #4 was all f*cked up. The sleeve was cracked in half as well as the block around cylinder 4. It really sucks! So were also trying to figure out what to do.

 

that ****** blows man. thats wut i wanna prevent. and it will also help everyone else as well.

 

6 of the members here in Arizona have blown their motors

Blown 4-Banger
SRT-killer
Gilbert
Waylin
BrianCGSS
Dstinsman56

They all had 11.8 AFR, but apparently not in CYL 4, and SRT-killer was only using 42# injectors, the rest were running 60#'s, They all blew Cylinder #4!

 

that ****** sucks. i bet there tho, theres a huge issue with heat as well.

 

Yeah Heat is a major issue. The heat creates a lot of knock and we have LOW 91 octane premium.

The strangest part was that These cars were not knocking when they blew their motor, and I know first hand from scanning it that BrianCGSS still had 0* of knock even AFTER he blew his motor.

They are blowing the 4th Cyl on NON-KNOCK related issues.

The problem with OVER-richening the tunes to compensate for the fuel problem will result in poor HP and sluggish response. We need to fix the actual problem, not just babysit it.

 

right, cuz the to get the fourth cylinder more fuel u have to richen the others as well so it makes it worse. this blows, Im about to go steal a fuel rail off of one of these lil cavi ricers. lol. they dont need it.

well im off to mow some lawns and get a start on gettin some cash for a used fuel rail and seein wut i can do. Cuz, i know if i dont doit myself. everyone will do it there self and have it done then be selfish and not send it in, jsut like ppl did with the dual gauge pod bezels.

 

k so i understand your issue, its really hard to read your posts at the start, but u are worried, heres my solution

im having a piece made to replace whatever the hell is at the end of the fuel rail, to out a 1/4 npt tap into, im gonna split my fuel in 2 and supply fuel at both end, makes life way easier, and means no more worrying about lack of fuel to any cylinder, im also thinking of doing a return line on mine, but im thinking maybe next year, i really really really want to get my car back on the road

to whoever said they dont think its a fueling issue, well last time i checked, when u have detonation it causes heat, what causes detonation a large amount of times, not enough fuel, i knwo for a fact that from cyl 1 to cyl 4 it becomes more and more lean, looks are the bottom of head after one has been blown and look at how much difference in color there is, but ne ways yes lets figure this out.

in 2 weeks im running my solution

 

nice!! finally someone to join the project, i took off the gay plastic cover that covers the fuel rail and now the fuel rail is visibile and i look at it everyday and wonder wat we can do

 

well ill go take pictures of the fuel rail specifically and ill show you what i wanna make, im thinking of running a digital fuel pressure guage as well,

 

which side of the fuel rail will you put the fuel pressure gauge tho?

i mean teh sensor thingy

 

Gentlemen.


If you actually read the other thread concerning this issue, you will learn that fuel starvation is not the issue. It is literally, physically impossible for the fuel pressure at #4 to be any different then the other 3.

We don't know the actual reason for the problem, but we believe it has to do with cooling due to #4 getting the engine coolant last. We have however eliminated fuel as the issue.

 

people should start running that watter wetter than, but wait so the engine coolant comes in through the left side the coolant pipe that travels over the blower right? and then comes back into the radiator, through the bottom near the front tranny mount right?

 

cant we just get our injectors flowmatched? then all the injectors would be pushing the same amount of fuel

 

Again, it has nothing to do with you fuel system, which includes your injectors.

The coolant does enter the left side through the head above #1. It then flows left to right and exits at the thermostat next to #4.

 

well looking at that post halfcent, i still ppl thinking its a pressure drop, and its on the 60lb an hour, i honestly dont think it keeps a steady pressure with 60 lb/hr injectors, but im not gonna get into it, im gonna just T my fuel and tap the other side

 

how exactly did we rule out fueling as the culprit? we know there is a pressure drop across the rail. and the ecotec race teams all run the lsj fuel rail with 2 feeds. how is it physically impossible, esp when running injectors that are 100% bigger than what the rest of the fueling system was designed to supply?

 

Yea I agree there is no fuel starvation issue infact With to rich of a tune you will find the number 4 I think closes to the tranny is will run rich and infact can cuase the plug to got bad from runing to rich if your tune is to rich or your not running irrdum plugs.

 

We ruled it out due to the laws of fluid dynamics. It is, in fact, physically impossible. In a closed fluid pressure system, the pressure within the system is constant throughout due to the incompressibilty of fluids. ASSUMING there is a pressure drop, then that drop would be through the whole system, and ALL of the injectors would suffer, not just #4.

The misconception here is that our fuel system works based on "flow". It works on pressure.

And how exactly do we know there is a pressure drop at the rail as you state? I've seen no such data, and if I did, it wouldn't be accurate.

The race engines don't use 2 feeds. Depending on the design, they might have two separate injectors per cylinder, and probably use a return, but not two feeds. If they need that much fuel, then they start with a larger pump and line.

 

The problem is, you have times when more than one injector is open and times when they're not, which can give consistant lower amounts of fuel to different portions of the rail. Firing order you'll see has a big impact on this.

The SRT guys upgrade to a return style system at anything larger than Stage 3 power for just this reason.

I still do believe that cooling is the issue, but the fluid dynamics theory doesn't take into account changes in flow and restrictions.

 

so how can we really find out about this who pressure thing? set up 2 fuel pressure gauges one at the begining of the line and one at the end? see what the differnece is if any?