Why #7?
04-05-2012, 08:21 PM
#61
so does anyone have any instructions or pics of the Kurt Urban system with the ls6 intake. I already sent number 7 on the stock bottom end to the moon. It was def hot in there. I am going to call my builder monday and make sure they address this before it ships to me.
04-05-2012, 08:25 PM
#62
that is with an LS2 intake.....on a gto. Used an 1/4 npt to 4 an fitting and tapped directly into the radiator with it where the stock tube went. Worked out pretty nice and looked good too. Alot of people asked him if he had nitrous because they saw the lines.
04-05-2012, 08:28 PM
#63
It's the intake not the steam vents that causes it.
Air follows the path of least resistance.
Forced induction does exactly as it's name says. It forces air into the motor. It's going to force its way to the back of the intake manifold until it hits the back of the manifold and is forced into the rear most two cylinders. Obviously not all the air does this, but more so than the other 6. Thus why they run leaner.
Steam ports don't help, but I think GM is smarter than us on this one.
Air follows the path of least resistance.
Forced induction does exactly as it's name says. It forces air into the motor. It's going to force its way to the back of the intake manifold until it hits the back of the manifold and is forced into the rear most two cylinders. Obviously not all the air does this, but more so than the other 6. Thus why they run leaner.
Steam ports don't help, but I think GM is smarter than us on this one.
04-06-2012, 07:26 AM
#64
It's the intake not the steam vents that causes it.
Air follows the path of least resistance.
Forced induction does exactly as it's name says. It forces air into the motor. It's going to force its way to the back of the intake manifold until it hits the back of the manifold and is forced into the rear most two cylinders. Obviously not all the air does this, but more so than the other 6. Thus why they run leaner.
Steam ports don't help, but I think GM is smarter than us on this one.
Air follows the path of least resistance.
Forced induction does exactly as it's name says. It forces air into the motor. It's going to force its way to the back of the intake manifold until it hits the back of the manifold and is forced into the rear most two cylinders. Obviously not all the air does this, but more so than the other 6. Thus why they run leaner.
Steam ports don't help, but I think GM is smarter than us on this one.
04-06-2012, 10:07 AM
#66
Who reversed the intake? Let's see these results?
Ask anyone that knows anything about air distribution they will tell you it's the intake.
I'm not arguing this.
I think GM knows something we don't here.
Why would they not even tap or drill these steam vent on the LS3 if that was the problem?
Ask anyone that knows anything about air distribution they will tell you it's the intake.
I'm not arguing this.
I think GM knows something we don't here.
Why would they not even tap or drill these steam vent on the LS3 if that was the problem?
04-06-2012, 10:08 AM
#67
People have done tests where #7 got hot, but the afr was still fine, so it's speculated that it has more to do with how the head and block is cooled than air distribution.
I've been told that by a few different people who've run the tests, but I did not do the tests myself, so it's second hand info. Take it as you may.
I've been told that by a few different people who've run the tests, but I did not do the tests myself, so it's second hand info. Take it as you may.
04-06-2012, 10:12 AM
#68
People have done tests where #7 got hot, but the afr was still fine, so it's speculated that it has more to do with how the head and block is cooled than air distribution.
I've been told that by a few different people who've run the tests, but I did not do the tests myself, so it's second hand info. Take it as you may.
I've been told that by a few different people who've run the tests, but I did not do the tests myself, so it's second hand info. Take it as you may.
This also goes for the LS6 intakes and fast styles and LS1's.
04-06-2012, 10:19 AM
#69
I think that the cooling system is the main problem with loosing #7
04-06-2012, 10:29 AM
#70
Actually I have personally seen some distribution issues left bank to right bank and back to front with the carb style intakes and forced induction as well. I honestly do not know the anwswer to this question either.
One thought I did have that I have not seen anyone mention is parallel vs series fueling. Has anyone tried switching to paarallel fueling to see if there was a change?
One thought I did have that I have not seen anyone mention is parallel vs series fueling. Has anyone tried switching to paarallel fueling to see if there was a change?
04-06-2012, 10:46 AM
#71
Actually I have personally seen some distribution issues left bank to right bank and back to front with the carb style intakes and forced induction as well. I honestly do not know the anwswer to this question either.
One thought I did have that I have not seen anyone mention is parallel vs series fueling. Has anyone tried switching to paarallel fueling to see if there was a change?
One thought I did have that I have not seen anyone mention is parallel vs series fueling. Has anyone tried switching to paarallel fueling to see if there was a change?
it would be interesting to see how many people have had #7 go with a basically stock fuel system and how many have upgraded to a series or parallel setup and still had #7 go.
Last edited by Ryans99ls1; 04-06-2012 at 10:55 AM.
04-06-2012, 10:49 AM
#73
You know ive thought about that too. with stock rails that side of the motor would see the fuel 'last' and any change in fuel pressure(maybe from a random split second voltage drop at high rpm) or anything might affect how well the fuel is delivered, especially to #7. that combined with inadequate cooling to the cylinder might be the deal breaker. just a thought.
thats honestly one of the reasons im doing fast fuel rails and running the return right off #7. Parallel may be better but we'll see.
thats honestly one of the reasons im doing fast fuel rails and running the return right off #7. Parallel may be better but we'll see.
Why does GM not even drill let alone tap a provision for steam ports on the LS3?
How many ODR LSX cars run rear steam vents? Most aftermarket heads don't even have the provisions for them.
04-06-2012, 10:56 AM
#74
I really wish the myth of the factory style intake causing the rear cylinders to run hotter would just go away. This has been disproven so many times I can't believe it's still being repeated. Air distribution is always a problem no matter what the intake especially at higher power levels but that's not the main cause. It's a cooling issue for the most part on the rear most cylinders and something that helps a little is to get rid of the blockoffs in the rear and vent it so if bubbles start to form you can get them out of there and have coolant do it's thing. Nothing is a magic bullet but all the little things can add up to a safer running combo.
04-06-2012, 11:01 AM
#75
Dead on. Combine that with the inherent flaw of a foward facing tb to always run the rear two cylinders leaner than the rest and you have the makings of a problem.
Why does GM not even drill let alone tap a provision for steam ports on the LS3?
How many ODR LSX cars run rear steam vents? Most aftermarket heads don't even have the provisions for them.
Why does GM not even drill let alone tap a provision for steam ports on the LS3?
How many ODR LSX cars run rear steam vents? Most aftermarket heads don't even have the provisions for them.