8.5:1 Pistons!?!?
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
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?
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?
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
LMAO!!! Someone gave me a bad rep point from this thread for
"Ignorance based on heresay and opinion, not fact"
^^^LM
AO^^^ Unless they work at an engine building shop like I do, that is just HALARIOUS!!!!
"Ignorance based on heresay and opinion, not fact"
^^^LM
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.
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.
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.
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.
Pics?
Last edited by chevysalesman614; Apr 17, 2007 at 09:01 AM. Reason: Automerged Doublepost
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
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
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.
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.
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.
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


