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Thread: Stock rotating assembly H/C lt1?
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10-30-2006, 01:26 PM #1
- Join Date
- Sep 2006
- Location
- Port Charlotte, FL
- Posts
- 5
DSG- 03 Cobra
Stock rotating assembly H/C lt1?
I have done searches and can not find any solid answers. I have plans to build a 97 lt1 with either an AI 185 or AI 200 heads and cam package with all of the supporting mods:
AI ported intake
30 lb inj
52 or 58mm tb
1 3/4 LTs + y pipe
maganaflow catback
CSR elec water pump
255lph intank pump
And many nickel and dime mods
I was planning on going with a forged rotating assembly or at least a set of SRP pistons, but I have reached the end of my budget. By going into the shortblock, I would have to shell out more money for machine work and balancing on top of the parts.
I plan on tearing down the engine soon. I will check the cylinders for wear, out of round, and taper. If it looks good I will clean up hone it replace the rings, bearings, and add arp rod bolts.
I know that the stock pistons are not the strongest, what I would like to know is : Will it last as long as it is kept N/A, has a safe tune without any detonation, and the rpms are kept within a safe limit?
I have seen quite a few stock lower end heads and cam cars run well into the 11s............ But how long do they do it for?
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10-30-2006, 03:43 PM #2
Just depends on the condition of the bottom end now. To get any more power out of the motor with H/C, you're going to need to rev it higher, which in turn will put more stress on all of the parts. You're also going to have higher cylinder pressures anyway. Kind of a crapshoot. The stock crank will not be a limiting factor, but for safe high rpm operation, the balance of the entire rotating assembly is crucial. When you rebuild the bottom end, I would suggest better pistons and rods. Better to do it once and do it right.
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10-30-2006, 06:36 PM #3
changing to 4 bolt mains would help with reliability issues winding the motor up to high rpms ..just a thought
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10-30-2006, 09:21 PM #4
At those power levels a 4 bolt main isnt needed IMO. I've built many racing engines, and a few have had 2 bolt mains, and the motors spent their entire racing lives running between 3000-7000rpm. Never a failure due to crank movement or cap failure.
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