Forged LQ9 pistons, stock compression ratio
06-12-2005, 08:06 PM
#6
Originally Posted by j4nash
if you are going to be running boost i would, but if you are planning on all motor then by all means go for it. 
would you do me a favor and read this and then tell me what you think?
starting at post 84
https://ls1tech.com/forums/showthrea...0&page=5&pp=20
thanks mate!
06-12-2005, 10:43 PM
#7
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ok from what I could gather you have a radix on your truck and you want to build your motor up to hold more power, but you are on a budget.
This is what I would do if I were in your shoes. Right now I would say save your money and not spend it on new heads; our heads actually flow pretty well. The week point on the lq9 for running high boost is, week crank and rods and our pistons are too high of a compression. If you are going to be building a motor I would get yourself a good set of rods and a dished piston to lower your compression. I think that our crank is good to around 600hp, so you should be fine to reuse the lq9 crank, but the rods are week.
But on the other hand if I was building a motor for myself and I had about $1200-2000 to spend I would get a stronger crank a set of really good rods and a set of dished piston that would put my compression down to around 9:1, then I could run about 15 psi of boost on my truck.
This is what I would do if I were in your shoes. Right now I would say save your money and not spend it on new heads; our heads actually flow pretty well. The week point on the lq9 for running high boost is, week crank and rods and our pistons are too high of a compression. If you are going to be building a motor I would get yourself a good set of rods and a dished piston to lower your compression. I think that our crank is good to around 600hp, so you should be fine to reuse the lq9 crank, but the rods are week.
But on the other hand if I was building a motor for myself and I had about $1200-2000 to spend I would get a stronger crank a set of really good rods and a set of dished piston that would put my compression down to around 9:1, then I could run about 15 psi of boost on my truck.
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06-12-2005, 11:18 PM
#8
TECH Junkie
A radix setup can't make 15lbs of boost with a 6.0 motor,you might get 9-10lbs max,so decreasing the compression is not nearly as important as providing adaquate fueling.With a desent cam,heads and exhaust you'll probably only have 8lbs of boost so your effective compression won't be that high.
06-12-2005, 11:20 PM
#9
Originally Posted by whitt1
A radix setup can't make 15lbs of boost with a 6.0 motor,you might get 9-10lbs max,so decreasing the compression is not nearly as important as providing adaquate fueling.With a desent cam,heads and exhaust you'll probably only have 8lbs of boost so your effective compression won't be that high.