#7 Piston Failure FIX !!!
04-06-2006, 07:18 AM
#1
#7 Piston Failure FIX !!! I found this tip reading Will Handzel's book How to Build High-Performance Chevy LS1/LS6 V-8's.
When GM started using the LS6 Intake manifold they omitted the rear steam vent tubes on rear of heads and used only a front vent tube version because of clearence issues with the lower floor of the LS6 manifold. Some road racers say blocking off the rear steam ports will cause detonation and damage the #7 piston. Here is the cure and I quote from book:
"TIP: Some road racers have been using the pre-LS6 steam tubes underneath the LS6 intake to improve cooling in cylinder number 7 (they previously had detonation problems in that hole). While the pre LS6 rear steam version was not used on factory LS6's, they will fit under the intake by slightly grinding down some of the stiffening ribs on the bottom side of the intake. Some racers just install the steam tube component and, during rebuilds, find some small indentions where the ribs come in contact with it and grind away for clearence."
Can we use the pre LS6 vent tube with the FAST intake?
.
When GM started using the LS6 Intake manifold they omitted the rear steam vent tubes on rear of heads and used only a front vent tube version because of clearence issues with the lower floor of the LS6 manifold. Some road racers say blocking off the rear steam ports will cause detonation and damage the #7 piston. Here is the cure and I quote from book:
"TIP: Some road racers have been using the pre-LS6 steam tubes underneath the LS6 intake to improve cooling in cylinder number 7 (they previously had detonation problems in that hole). While the pre LS6 rear steam version was not used on factory LS6's, they will fit under the intake by slightly grinding down some of the stiffening ribs on the bottom side of the intake. Some racers just install the steam tube component and, during rebuilds, find some small indentions where the ribs come in contact with it and grind away for clearence."
Can we use the pre LS6 vent tube with the FAST intake?
.
Last edited by gollum; 04-16-2006 at 06:07 PM.
IM interested in this, especially once I start spraying. 
04-06-2006, 09:28 PM
#6
Originally Posted by gollum
I found this tip reading Will Handzel's book How to Build High-Performance Chevy LS1/LS6 V-8's.
When GM started using the LS6 Intake manifold they omitted the rear steam vent tubes on rear of heads and used only a front vent tube version because of clearence issues with the lower floor of the LS6 manifold. Some road racers say blocking off the rear steam ports will cause detonation and damage the #7 piston. Here is the cure and I quote from book:
"TIP: Some road racers have been using the pre-LS6 steam tubes underneath the LS6 intake to improve cooling in cylinder number 7 (they previously had detonation problems in that hole). While the pre LS6 rear steam version was not used on factory LS6's, they will fit under the intake by slightly grinding down some of the stiffening ribs on the bottom side of the intake. Some racers just install the steam tube component and, during rebuilds, find some small indentions where the ribs come in contact with it."
Can we use the pre LS6 vent tube with the FAST intake?
.
When GM started using the LS6 Intake manifold they omitted the rear steam vent tubes on rear of heads and used only a front vent tube version because of clearence issues with the lower floor of the LS6 manifold. Some road racers say blocking off the rear steam ports will cause detonation and damage the #7 piston. Here is the cure and I quote from book:
"TIP: Some road racers have been using the pre-LS6 steam tubes underneath the LS6 intake to improve cooling in cylinder number 7 (they previously had detonation problems in that hole). While the pre LS6 rear steam version was not used on factory LS6's, they will fit under the intake by slightly grinding down some of the stiffening ribs on the bottom side of the intake. Some racers just install the steam tube component and, during rebuilds, find some small indentions where the ribs come in contact with it."
Can we use the pre LS6 vent tube with the FAST intake?
.
Here's a question......out of all of those that had #7 go.....how many had the stock LS1 intake and coolant lines on?
Are most of the trashed #7's running LS6 intakes?
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04-06-2006, 11:05 PM
#10
TECH Addict
I think us truck guys still have that rear crossover tube. Some people have knocked out #7 with the truck intake and the crossover tube.
8ALTNG if I'm not mistaken.
8ALTNG if I'm not mistaken.
04-08-2006, 06:42 AM
#14
I looked into this tube, and I will just about guarintee that putting it on isn't going to fix the problem with #7 failing. The intake, the way it is designed causes the air to be slammed into the back of the intake, and #7 being the last one in the back of the intake is going to always get the most amount of air.. in translation, this tube really willl not make any difference, because the real problem isn't with the cooling system, it is with the intake design.
Like stated above, putting the heaviest injector in #7 is the only thing you can really do that will have any real impact on this matter. If a DP nitrous kit is being run, it's probably an easier thing to deal with (on a race car that sees nothign but WOT) because one smaller nitrous jet, or a size or 2 up on the fuel jet can be done and the problem is pretty much solved.
Like stated above, putting the heaviest injector in #7 is the only thing you can really do that will have any real impact on this matter. If a DP nitrous kit is being run, it's probably an easier thing to deal with (on a race car that sees nothign but WOT) because one smaller nitrous jet, or a size or 2 up on the fuel jet can be done and the problem is pretty much solved.
04-08-2006, 07:52 AM
#15
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Originally Posted by The Alchemist
I have the LS6 intake on my 2000 f-body and when I put it on, I was cheap (actually they didn't have the block off lines) and just grinded down the areas under the ls6 intake so that I could keep the stock vent tubes.
I did the same thing. Works fine with the LS6 intake. (Can't speak for the LSX though.)
04-17-2006, 07:36 PM
#16
Read this:
Originally Posted by FASTFATBOY
Just wanted to throw this out there..I have seen 3 LS1 cars with a random misfire on #7, one with a dead miss, with the fuel system being a "dead head" system(no return to tank)...I tore down the fuel rails on all 3 cars....all cars were FULL of trash in the rear drivers side of the rail(#7)..all 3 cars were fixed with a cleaning and clean injectors. They picked up SERIOUS amounts of power.
Maybe look at this in the future.
David
Maybe look at this in the future.
David
04-17-2006, 07:53 PM
#17
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Originally Posted by gollum
Read this:
04-17-2006, 09:13 PM
#18
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I understood it to mean the fuel rail. On dead head systems, I can see that happening because even a great filter lets somethings pass through and eventually you'd get a build up of junk.
