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8.5:1 Pistons!?!?

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Old Apr 1, 2007 | 05:39 AM
  #51  
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No, the stock ss s/c rods are rated to like 450-500 hp. There based off the Pink rods for the small block chevy. The stock rods are forged, and people don't give them enough credit, just because they are stock. Think about this, have you EVER heard of stock LSJ rods failing? I sure haven't, many people have had pistons fail, put forged pistons, and never have any more problems. The rods are good, hell Rice eater's crank failed before the rods did!
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Old Apr 1, 2007 | 11:20 AM
  #52  
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The build book says not to use them in applications over 300hp. My machine shop said it was not a good idea to use them. I told them that they are similar to sb Chevy pink rods, but they said they would be inadequate. I'm not saying they will fail, I just figure while it's apart why not?
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Old Apr 1, 2007 | 11:34 AM
  #53  
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good luck, i expect to hear another "i broke my engine" thread from you in the next month or two
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Old Apr 1, 2007 | 11:37 AM
  #54  
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Originally Posted by cobaltBlackss
The build book says not to use them in applications over 300hp. My machine shop said it was not a good idea to use them. I told them that they are similar to sb Chevy pink rods, but they said they would be inadequate. I'm not saying they will fail, I just figure while it's apart why not?
I think you are confusing the 2.2 build book with the LSJ's build book. The 2.0 are forged and will do just fine for most people's needs.
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Old Apr 1, 2007 | 03:11 PM
  #55  
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Old Apr 1, 2007 | 03:32 PM
  #56  
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^^^ Thank you, that's what I was refering to.
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Old Apr 1, 2007 | 04:22 PM
  #57  
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In the LSJ build book it says the stock rods "...are more than capable of handling 300 hp..."
I can not afford the JBP rip off rods, it would be cheaper to get a set custom CNC machined.
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Old Apr 1, 2007 | 04:23 PM
  #58  
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Then again there is also this from the LSJ 300hp build book.
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Old Apr 1, 2007 | 04:31 PM
  #59  
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Yeah I saw that too... It seems like there is so much conflicting info out there. I didn't want to take the chance so I just got some eagle rods and had the crank machined.
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Old Apr 1, 2007 | 06:12 PM
  #60  
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Had the crank machined? What do you mean? Do you mean you had the crank lightened?
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Old Apr 1, 2007 | 06:27 PM
  #61  
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Originally Posted by Blown 4-banger
Had the crank machined? What do you mean? Do you mean you had the crank lightened?
No, the big end (where it attaches to the crank) on the 2.2 rods is not the same size as the big end of the 2.0 rods, it's smaller. My solution was to make the crank fit the rods.
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Old Apr 1, 2007 | 06:51 PM
  #62  
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Wow. Not the route I would have gone, but I guess it should work. Make sure you get the right pistons for the rods. They L61 rod is longer than the LSJ rod.

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Old Apr 1, 2007 | 07:01 PM
  #63  
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Yeah the only reason i did it that way was because I allready had custom pistons made
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Old Apr 1, 2007 | 07:27 PM
  #64  
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Why would you ruin the crank like that and make it weaker?
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Old Apr 1, 2007 | 10:23 PM
  #65  
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It's not very much material, maybe .0200
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Old Apr 2, 2007 | 08:58 AM
  #66  
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So did you end up getting any sleeve damage? Any pictures of the piston?

I would wait and save to do it right the first time. You probably don't want to open this motor up again. I know my car has been in the air for 5 months now.
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Old Apr 2, 2007 | 10:05 AM
  #67  
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so is this 300 hp at the wheels or crank? does anyone besdies jbp make rods for our cars and how much do they run?
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Old Apr 2, 2007 | 10:17 AM
  #68  
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Only JBP makes rods for our cars, price is listed on their site, but it will vary depending on vender. Probably around $800+ USD range.
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Old Apr 2, 2007 | 10:43 PM
  #69  
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Originally Posted by WSFrazier
Only JBP makes rods for our cars, price is listed on their site, but it will vary depending on vender. Probably around $800+ USD range.
R-I-P O-F-F
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Old Apr 5, 2007 | 07:23 AM
  #70  
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ok I am starting to follow this thread.... I am running the 2.2 headgasket so if I read everything right then I shouldnt go anything less 9.5:1 because it will increase the chances of detonation?
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Old Apr 5, 2007 | 02:51 PM
  #71  
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Originally Posted by Blown 4-banger
R-I-P O-F-F
fixed it for you
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Old Apr 6, 2007 | 02:46 AM
  #72  
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Originally Posted by blown06
ok I am starting to follow this thread.... I am running the 2.2 headgasket so if I read everything right then I shouldnt go anything less 9.5:1 because it will increase the chances of detonation?
No. Lower compression decreases the risk of detonation. The more boost you want, the lower the compression. As for the 2.2 gasket you should be ok. It is slightly thicker than the 2.0 gasket so it lowered your compression slightly.
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Old Apr 6, 2007 | 03:01 AM
  #73  
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Originally Posted by Cobalt_Supercharged
No. Lower compression decreases the risk of detonation. The more boost you want, the lower the compression. As for the 2.2 gasket you should be ok. It is slightly thicker than the 2.0 gasket so it lowered your compression slightly.
Damn George! You tell him that the thicker gasket is cool, but I get bitched at by Cameron for throwing out the idea of a slightly thicker gasket! So what's the deal, is it okay on a boosted motor or not?
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Old Apr 6, 2007 | 03:27 AM
  #74  
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Thicker is not better, but the difference is very slight with 2.2 and 2.0. The 2.2 Cometic is also design to handle boost though.
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Old Apr 6, 2007 | 03:32 AM
  #75  
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yo cameron how is the build coming along?, and i showed my cousin your fly by video and he pretty much was like HOLY ****!!!! and im leaving florida guys, talk to you guys when im back in new york peace!!!!
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