long ratio rod?
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long ratio rod? Can anyone see any problems with using a 6.300" SBC rod for a 392 big bore (stock stroke) motor? The compression height seems to be thicker with this setup than would be used on a 4" stroke/6.125" rod setup so I would "think" oil controle would not be a problem.
Chris
Chris
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From: Seattle
If the compression height is good, the get the longest rod you can, I always have done that with every motor I build. It may not make anymore power, but I am convinced it adds longevity to the engine. So go for it.
Hunter
Hunter
This is a pic of my 6.3" rod and a sock bore lunati piston. It is actually the same piston you would use with a 4"stroke 6.125" rod. Compression height is the same (1.13"). You can see that there is not much land under the oil control ring, but it no where as crazy as some sbc stroker setups where the pin is actually up in the oil control ring.
Bryan
Bryan
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I think the set new with the bolts would be $1100+... I picked them up used(couple years old), and had the pin bushings replaced and honed to be as new. I think I'm into them for $600 to $700
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Verdad Gallardo they are sbc rods.. if you follow the line of sight in that last pic, you can see it lines up with the center of the piston very well. The aftermarket pistons have enough room side to side to give you clearance with either rod. You can see the pin on either side of the rod in that pic.
To add a little more information on this subject, an old engine builder I was talking to just tonight said a longer rod will yield a motor that produces it's power at a higher rpm. If you are going for low rpm power, use the shorter con rod. It all has to do with the amount of time the piston spends near the top of the stroke where the combustion presure is the highest.
Last edited by Cal; Dec 14, 2003 at 09:45 PM.
Thread Starter
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I'm shooting for mid to high RPM power (already have way too much low end for street tires).
Cal, is your 9" an aluminum center section or is it an aluminum housing?
Cal, is your 9" an aluminum center section or is it an aluminum housing?
Originally Posted by 2001CamaroGuy
Cal, is your 9" an aluminum center section or is it an aluminum housing?
