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8.5:1 Pistons!?!?

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Old Apr 6, 2007 | 08:30 AM
  #76  
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Ima be done before you Cam I finally ordered everything I need at once today.
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Old Apr 6, 2007 | 10:01 PM
  #77  
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Originally Posted by WSFrazier
Ima be done before you Cam I finally ordered everything I need at once today.
Yeah he is still waiting to get all the money together.
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Old Apr 7, 2007 | 12:04 AM
  #78  
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Originally Posted by WSFrazier
Ima be done before you Cam I finally ordered everything I need at once today.
Yeah, but once mine is done, it will smoke yours
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Old Apr 7, 2007 | 09:52 AM
  #79  
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Psh, as long as we are both still using the m62 I would love to see it. Twinscrew is on hold for me until I see how Dans massive turbo works out.
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Old Apr 7, 2007 | 06:19 PM
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I would never desicrate my car with a turbo. I'm doing a twin screw, prolly gonna weld a sheet metal intake at work. If I can't find a used W75AX, I'll use a W140AX. Should turn out around 45 psi boost with the W140
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Old Apr 7, 2007 | 06:25 PM
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Originally Posted by Blown 4-banger
I would never desicrate my car with a turbo. I'm doing a twin screw, prolly gonna weld a sheet metal intake at work. If I can't find a used W75AX, I'll use a W140AX. Should turn out around 45 psi boost with the W140
Good luck.....
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Old Apr 7, 2007 | 06:27 PM
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desecrate? The motor had a Turbo before the S/C. GM did the desecration.

But in the end I guess we shall see who is teh fast@r.

So what are you doing as far as rods and pistons anyway? Anything definite?
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Old Apr 7, 2007 | 06:41 PM
  #83  
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I'm taking my rods out tomorrow and giving them up, so they can be measured and stuff. In the end I should get a set of CNC machined rods back, prolly able to handle 1000+ hp LOL. I'm still lookin for pistons thats aren't $700 or more. No luck yet
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Old Apr 8, 2007 | 03:29 PM
  #84  
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LMAO!!! Someone gave me a bad rep point from this thread for
"Ignorance based on heresay and opinion, not fact"
^^^LMAO^^^ Unless they work at an engine building shop like I do, that is just HALARIOUS!!!!
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Old Apr 14, 2007 | 12:35 PM
  #85  
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Ok, so update! I decided to go with 9.5:1 pistons, cheaper, more power with the eaton, and I should still be able to run the best amount of timing with 109 octane once I get the twin screw. The 9.5:1 pistons are $200-$300 CHEAPER than custom made 8.5:1 pistons.
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Old Apr 14, 2007 | 05:49 PM
  #86  
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Yay!!!
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Old Apr 14, 2007 | 05:53 PM
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You still using custom rods?
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Old Apr 14, 2007 | 06:32 PM
  #88  
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Well Cobalt_Supercharged said it should be possible. I wanna make em outta 4340 and be able to hold at least 1000 hp.
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Old Apr 14, 2007 | 07:02 PM
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We will see. 4340 is good stuff (90,000 psi tensile strength), but the problem may be splitting the bearing cap from the rod. Normally they are fracture split which leaves an uneven surface that allows for more surface area. I don't think I will have access to something like like that so we may have to resort to just machining them seperatly from the same piece of stock.

Also 4340 is is strongest when forged to make E4340. Very strong and the same material that the JBP rods are made of to reach "700-750 hp"

I'll have to talk to m instructors some more about it when I have a rod, some dimensions, and a specific material to work with. I'll also create a few different designs and analyze them to see which has the best structural integrity with each material discussed.
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Old Apr 14, 2007 | 07:05 PM
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Sounds iffy and time consuming. Lol. GL though.
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Old Apr 16, 2007 | 07:44 PM
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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.
I think you are wrong, after reading your links I think Cameron needs a Bigger Cam, Retard the timing, Run leaner, and not worry about octane, then his Banger will be a screamer
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Old Apr 17, 2007 | 03:18 AM
  #92  
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^ ^ You mean he would be a screamer as he scrounged to find the peices of his motor scattered for a 2 mile radius.
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Old Apr 17, 2007 | 08:35 AM
  #93  
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So after all this you expect your times to be what? 14.9 @ 115 ? Lol...
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Old Apr 17, 2007 | 08:56 AM
  #94  
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haha Cameron did you ever find those pistons?
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Old Apr 17, 2007 | 09:01 AM
  #95  
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Originally Posted by Witt
Contact diamond and get a custom set made, or use a lower compression 2.2 piston rod combo.
stroke that bitch to 2.2L IMO.
And since the motor is out, and it will be easy, you might as well convert to a return-style fuel system. Maybe you can save #4 from blowing again.

Originally Posted by MoparMan
I think you are wrong, after reading your links I think Cameron needs a Bigger Cam, Retard the timing, Run leaner, and not worry about octane, then his Banger will be a screamer
You put a skyline block in that car in your Sig? Holy ****!

Pics?

Last edited by chevysalesman614; Apr 17, 2007 at 09:01 AM. Reason: Automerged Doublepost
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Old Apr 17, 2007 | 09:25 AM
  #96  
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Originally Posted by HackAbuse
Screw the Eaton, get a Whipple
Originally Posted by Blown 4-banger
I would never desicrate my car with a turbo. I'm doing a twin screw, prolly gonna weld a sheet metal intake at work. If I can't find a used W75AX, I'll use a W140AX. Should turn out around 45 psi boost with the W140

Well I wont say I am an expert but I do have some mechanical knowledge to say this article seems to make sense. you are doing drag racing for sure you want turbo. but each to their own. heres an article from ZZP.

https://www.zzperformance.com/cobalt...les1.php?id=55
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Old Apr 17, 2007 | 03:48 PM
  #97  
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Thumbs up

Originally Posted by chevysalesman614
You put a skyline block in that car in your Sig? Holy ****!
Pics?
Lol, yeah I did I thought why not switch out the old 6 for a new one. Right now the motor is teared down getting cleaned, installinga JUN crank collar, A NISMO gasket set and race oil pump. I have been taking pics and videos of the entire process and you guys will be the first to see it
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Old Oct 11, 2007 | 06:14 PM
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im looking to go with the 8.5:1 also
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Old Oct 11, 2007 | 07:20 PM
  #99  
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holy old post. 8.5:1 I wonder if Blown is really still doing this since he wants to be SC. I would think he should go 10:1 instead. Would have to read up on that but instead maybe he can just chime in here.
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Old Oct 12, 2007 | 09:13 PM
  #100  
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He went with the stock 9.5:1 for drivability. If the M62 doesn't meet his efficiency/power requirements the next step is to save for a different SC.

Originally Posted by spike
im looking to go with the 8.5:1 also
What are your plans for the engine? You need to plan well in advance with this motor. There are a few different routes to take to building the internals, some routes are easier and cheaper than others. Blown 4-banger can attest to that.

Last edited by Cobalt_Supercharged; Oct 12, 2007 at 09:13 PM. Reason: Automerged Doublepost
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