5.7 or 6 inch rods??
05-27-2004, 05:04 PM
#1
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Location: baycity, mi
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5.7 or 6 inch rods??
ive been searching but i cant get a exact answer.. im about to order my forged 383stroker kit, and i plan on juicin a 200 shot or so, but the question is, which rods are going to better suit my project?? im burrying alot of money into this, so i want it done right so i have no regrets. thanks in advance!!
05-27-2004, 05:10 PM
#2
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Location: Springfield, IL
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<--(n00b)..
5.85".......$$$ but best of both worlds
from what i gather a longer rod moves the pin farther up in the piston decreasing the ringland area which can lead to a weaker combination (especially under boost or juice) and can create more cylinder wall side loading
a shorter rod is the opposite of that but doesnt get the piston speed up as high as the 6" rod does
i think thats how i understood it anyway
if i understand right i would go with a shorter rod and a beefy piston combo so i could torture it with all kinds of juice
5.85".......$$$ but best of both worlds
from what i gather a longer rod moves the pin farther up in the piston decreasing the ringland area which can lead to a weaker combination (especially under boost or juice) and can create more cylinder wall side loading
a shorter rod is the opposite of that but doesnt get the piston speed up as high as the 6" rod does
i think thats how i understood it anyway
if i understand right i would go with a shorter rod and a beefy piston combo so i could torture it with all kinds of juice
05-27-2004, 05:41 PM
#3
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Location: Nashville, TN
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A longer rod decreases cylinder side loads from a smaller angle from rod to piston. A longer rod also causes slower piston speeds, putting less stress on the bearings at higher rpms. This is the reason the LS1 uses longer rods, to create a larger rod/stroke ratio.
Jason
Jason
05-27-2004, 05:44 PM
#5
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Originally posted by simple
<--(n00b)..
5.85".......$$$ but best of both worlds
<--(n00b)..
5.85".......$$$ but best of both worlds
The prices of the 3 sizes was the same on the Eagle H-beams.
Last edited by gb95zconv; 05-27-2004 at 05:47 PM.
05-28-2004, 09:59 AM
#10
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More rod angle gives more torque. to a maximum point (1.62 or somthing) Piston speed isnt all bad either. It does cause more wear but the faster the piston goes down on your intake stroke the better you fill your cyl. I agree 5.85 is probibly the closest to ideal rod raito but its usually more $$$.
05-28-2004, 10:37 AM
#11
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You might want to do a "search" on the Advanced Tech board regarding the affect of rod/stroke ratio..... the general consensus among the experienced engine builders seems to be that it isn't worth worrying about when it comes to street engines. NASCAR engine... yes its important.
I also opted for the 5.85" rod length on my 381, in order to get the ring pack spacing I wanted (get the top ring away from the heat), keep the wrist pin from going too far into the bottom ring, and allow for strength in the top of the piston to handle a 300-shot. So far its worked fine.
I also opted for the 5.85" rod length on my 381, in order to get the ring pack spacing I wanted (get the top ring away from the heat), keep the wrist pin from going too far into the bottom ring, and allow for strength in the top of the piston to handle a 300-shot. So far its worked fine.
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