Rear coolant steam vent modified for LS6 with pics
01-23-2012, 07:33 PM
#1
Rear coolant steam vent modified for LS6 with pics We all know the rear cylinders are more prone to go lean or detonate. Much debate has occurred over why this is the case. There are some posts floating around where someone turned the intake manifold around backwards and the rear cylinders were still more prone to go lean. Although the intake manifold design seems to play a role, the root cause seems to be surrounding the coolant passages as 99% of people block off the rear ports.
I am certainly not the inventor, but most everyone I've seen who does run coolant lines to the back of the heads, drills and taps the heads for braided lines, or runs a stock ls1 intake with stock crossover. Here are the steps I took to use an extra ls6 crossover i had with my ls6 intake.
PS.....I know I need to swap to a metal tee fitting, the plastic is the only one i had handy
maybe this will shed some light on how easy this mod is and maybe prevent more from lifting the infamous #7 ringland.
LS6 crossover, removed the factory hose shown in the picture
Small piece of the ls6 intake that needed to be ground down slightly
Required bending to get the crossover around the oil pressure sensor
Simply tee'd the 2 coolant crossovers together and reconnected to port on the radiator
I am certainly not the inventor, but most everyone I've seen who does run coolant lines to the back of the heads, drills and taps the heads for braided lines, or runs a stock ls1 intake with stock crossover. Here are the steps I took to use an extra ls6 crossover i had with my ls6 intake.
PS.....I know I need to swap to a metal tee fitting, the plastic is the only one i had handy
maybe this will shed some light on how easy this mod is and maybe prevent more from lifting the infamous #7 ringland.LS6 crossover, removed the factory hose shown in the picture
Small piece of the ls6 intake that needed to be ground down slightly
Required bending to get the crossover around the oil pressure sensor
Simply tee'd the 2 coolant crossovers together and reconnected to port on the radiator
Last edited by ddnspider; 01-23-2012 at 07:40 PM.
01-24-2012, 03:52 PM
#10
Yes it does, and that's what I had when I ran an LS6 intake, but when I went to a FAST, I couldn't do that so I blocked off the rear tubes. I ran that way for quite some time until this summer when I put on a Procharger. I kne wit then that I should have gone back to the LS6 intake and the vent tubes, but didn't.
Like I said, you live and learn.
01-24-2012, 04:02 PM
#11
There isn't much that is safe with the compression and boost you were running on a stock bottom end with pump gas. Regardless of what timing you had that combination of fuel / compression and boost wasn't safe. For reference a lot of stock bottom end LS2's(11:1) with a D1SC or turbo don't run past 10 degrees of timing with 6-8lbs of boost without knock on pump gas.
01-24-2012, 06:54 PM
#14
9 Second Club
Dont want to sound over critical. But use some proper clips on that hose !! Not shitty worm drive which should never be used on small diameter hose as they close up anything but round.
And I assume that photo is at the trial fitting ? Ensure proper clips on the tee piece too unless there are very good barbs on it and top quality hose is used.
And I rarely trust any of that basic universal silicone hose. It's usually far too soft for anywhere important as it splits very easy.
And I assume that photo is at the trial fitting ? Ensure proper clips on the tee piece too unless there are very good barbs on it and top quality hose is used.
And I rarely trust any of that basic universal silicone hose. It's usually far too soft for anywhere important as it splits very easy.
01-24-2012, 07:09 PM
#15
There isn't much that is safe with the compression and boost you were running on a stock bottom end with pump gas. Regardless of what timing you had that combination of fuel / compression and boost wasn't safe. For reference a lot of stock bottom end LS2's(11:1) with a D1SC or turbo don't run past 10 degrees of timing with 6-8lbs of boost without knock on pump gas.
And you're right, I knew I was pushing it way beyond what's safe, but it was fun while it lasted.
01-24-2012, 07:30 PM
#16
Dont want to sound over critical. But use some proper clips on that hose !! Not shitty worm drive which should never be used on small diameter hose as they close up anything but round.
And I assume that photo is at the trial fitting ? Ensure proper clips on the tee piece too unless there are very good barbs on it and top quality hose is used.
And I rarely trust any of that basic universal silicone hose. It's usually far too soft for anywhere important as it splits very easy.
And I assume that photo is at the trial fitting ? Ensure proper clips on the tee piece too unless there are very good barbs on it and top quality hose is used.
And I rarely trust any of that basic universal silicone hose. It's usually far too soft for anywhere important as it splits very easy.
As for the tee fitting, yes I am aware i need to get clamps on there, I'll be switching to a metal tee fitting, per my initial post, as soon as I get a chance to get to the hardware store. I actually brought the car up to temperature with the plastic fitting and no clamps and I could feel water circulating, so that's a good sign.
01-24-2012, 08:18 PM
#17
ok i have a 5.3 truck motor and gonna replace the intake with an LS1 intake i bought,not sure if i have that crossover on my truck engine,if i dont ,is what i need a crossover from a ls6, and i see the blue hose,where does it go after the crossover,,the radiator?? thanks New to this motor
