Rod question
12-30-2011, 06:22 PM
#1
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Rod question Is there a reason why (crank clearance?) you can not use a 6 inch rod with a 1.425 CH piston? in a 2002 LQ4. Basically its a rod and piston combo for a genII 383
Thanks
Thanks
Last edited by hollywood63; 12-30-2011 at 06:45 PM.
12-30-2011, 07:50 PM
#2
other than the fact your piston would be over .060 inch out of the hole, no.
also depends on what crank you use.
my calculations are based on a 3.75 crank for the 383 and a 4 inch crank for the 6.0...
also depends on what crank you use.
my calculations are based on a 3.75 crank for the 383 and a 4 inch crank for the 6.0...
Last edited by bww3588; 12-30-2011 at 07:56 PM.
12-30-2011, 08:00 PM
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Well I believe the rods "offset" measurments are different from gen 1 & 2 to gen 3 & 4 but more importantly The stock LS1 rod length is 6.098" and CH is 1.326" so add 6.098 and 1.326 and 1/2 of the stroke 3.622 or 1.811" so 1.811 plus 1.326 plus 6.098 and You should be right at 9.24" so a longer rod and a piston with larger than 1.326 would mean the piston would come out of the hole about .125 " or whatever ,,,,,I don't remember the CH of the piston You mentioned but it was 1.4xx something .
12-30-2011, 08:05 PM
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This is what I came up with
.5 x 3.622 = 1.811 + 6 = 7.811 + 1.425 = 9.236
.5 x stroke + rod Length + comp hgt = piston deck height
with a stock deck height of 9.240 and everything else being perfect I figured i'd be .004 down
Did I figure correct?
What are you referring to with "rod offset"
.5 x 3.622 = 1.811 + 6 = 7.811 + 1.425 = 9.236
.5 x stroke + rod Length + comp hgt = piston deck height
with a stock deck height of 9.240 and everything else being perfect I figured i'd be .004 down
Did I figure correct?
What are you referring to with "rod offset"
12-31-2011, 01:07 AM
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Offset is on the side to side plane inline with the crank from front to back the center of the pistons are'nt on the center line of the rods ,,,,,,they are just a little bit off center ,,,,,,,,not enough that's noticeable when looking at them with You're eyes ,,,,,,,,,,You can kinda see it if You compare the side of the rod that's rounded to the side that's squared off on the GM rods .
