Why is it the 7th cylinder that breaks first most of the time
02-24-2008, 04:57 PM
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Why is it the 7th cylinder that breaks first most of the time I keep hearing that the 7th will go or the the 7th went. what the deal with that?
Is it just LS engine ? Just stock engine? why?
Is it just LS engine ? Just stock engine? why?
02-24-2008, 05:32 PM
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The FAST does it as well. I burnt the #7 piston on my CETA shooting the car. I also mushroomed the #7 intake and exhaust valves in my old Z28
02-24-2008, 05:52 PM
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I think there are possibly issues with coolant circulation in the back of the heads. Since the LS6 intakes eliminate water flow through the rear steam tubes, air pockets and /or hot spots could develop. As performance and hp increases so does heat.
When I installed my Fast, I afro engineered a set up that connected with the front steam tubes so that coolant would circulate. I was amazed how much coolant flowed through those back steam tubes.
When I installed my Fast, I afro engineered a set up that connected with the front steam tubes so that coolant would circulate. I was amazed how much coolant flowed through those back steam tubes.
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02-25-2008, 05:25 AM
#10
My tuner doesn't lean to 13:1, which seems to be the norm here just to help prevent this. He also showed me that going from a 12.5:1 to 13:1 on the dyno only netted a few hp.
I think a higher flow water pump might help, but its not proven either. Best is to make sure you don't lean your tune too much as a starter.
I think a higher flow water pump might help, but its not proven either. Best is to make sure you don't lean your tune too much as a starter.
02-25-2008, 07:56 AM
#11
, and another, 
02-25-2008, 09:15 AM
#13
If you can, keep the coolant tubes for the crossover, heat hurts it. Next is as previously mentioned, the fattest running injector you have when flow tested should be on 7. When tuned, don't go the traditional lean, richen it up a bit more than you would. I have my setup running 12.7 AFR, 13 would net a bit more hp, but I was aiming longevity.
Read the plugs after some driving. Your plugs will tell you the state of the burn going on inside.
Read the plugs after some driving. Your plugs will tell you the state of the burn going on inside.
