The longer the connecting rods, the more RPM I could rev ?
03-27-2012, 12:51 AM
#1
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The longer the connecting rods, the more RPM I could rev ? I know it's a weird question ....
I have an H/C LS1 347 , patriot heads and a 111LSA cam, stock gm ls1 crankshaft , 6.200 compstar rods and Diamond -2cc 3.905 pistons , It's on a M6 T/A WS6 putting down 470rwhp N/A , 780rwhp on 1st stage and 870rwhp on 1st+second stage. It's a daily use street car. As you know the motor have a 6.200 rods which is a longer rod than the stock ones , and the usual rods which is the 6.125. My question is , does the rods effect the RPM ? I mean the longer the rod the more rpm you can rev ? Can I push my car to 7000rpm and then shift without any risk? can my diamond pistons stand that kind of rpm ? as you know it's a nitrous car so I'm trying to go with max power...
Here's some answers I recieved until now ....
A friend : yes , with 6.200 rods, you can go even more than 7000rpm safely.
Another friend: with those 6.200 rods , you can't rev up to 7000rpm , but with a longer rod , the only difference is the RPM's accelerates faster 'more torque'
The 3rd friend: It's up to the tuner , you could get you'r car tuned to push you'r motor down to 7000rpm , the diamond pistons handle's this kind of power.
Waiting for you'r feedback
I have an H/C LS1 347 , patriot heads and a 111LSA cam, stock gm ls1 crankshaft , 6.200 compstar rods and Diamond -2cc 3.905 pistons , It's on a M6 T/A WS6 putting down 470rwhp N/A , 780rwhp on 1st stage and 870rwhp on 1st+second stage. It's a daily use street car. As you know the motor have a 6.200 rods which is a longer rod than the stock ones , and the usual rods which is the 6.125. My question is , does the rods effect the RPM ? I mean the longer the rod the more rpm you can rev ? Can I push my car to 7000rpm and then shift without any risk? can my diamond pistons stand that kind of rpm ? as you know it's a nitrous car so I'm trying to go with max power...
Here's some answers I recieved until now ....
A friend : yes , with 6.200 rods, you can go even more than 7000rpm safely.
Another friend: with those 6.200 rods , you can't rev up to 7000rpm , but with a longer rod , the only difference is the RPM's accelerates faster 'more torque'
The 3rd friend: It's up to the tuner , you could get you'r car tuned to push you'r motor down to 7000rpm , the diamond pistons handle's this kind of power.
Waiting for you'r feedback
03-27-2012, 01:21 AM
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The race fuel should'nt be a problem , I have 12 gallons of the C16's 
but the problem is , I'm in kuwait and our tuners sux!
is there a way to contact some tuners from the US , pay them through the credit card and send me the tunning files ?
believe me , with tuners at kuwait , you can no more use the A/C after tunning the car using a 114 LSA or under cams) they sux XD
but the problem is , I'm in kuwait and our tuners sux!
is there a way to contact some tuners from the US , pay them through the credit card and send me the tunning files ?
believe me , with tuners at kuwait , you can no more use the A/C after tunning the car using a 114 LSA or under cams
) they sux XD
03-27-2012, 05:23 AM
#4
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there is less than 1% difference in piston speed and acceleration at a given RPM with the 6.1 vs the 6.2 rods.
if you're trying to reduce piston speed and/or acceleration at a given RPM, you need to reduce the stroke.
if you're trying to reduce piston speed and/or acceleration at a given RPM, you need to reduce the stroke.
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03-28-2012, 04:22 AM
#8
TECH Senior Member
Rod length doesn't make much difference to piston speed and acceleration, and so it doesn't limit rpm;
stroke makes a huge difference in PS and PA and is what limits rpm;
rod length reduces the thrust angle and thrust loading which reduces cylinder wear and friction.
The things that limit rpm are stroke and reciprocating mass.
stroke makes a huge difference in PS and PA and is what limits rpm;
rod length reduces the thrust angle and thrust loading which reduces cylinder wear and friction.
The things that limit rpm are stroke and reciprocating mass.
03-28-2012, 10:56 AM
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More rod length reduces side loading or friction within an engine but how dramatically you have reduced friction is measured by where you began. Not much of a friction reduction between 6.1 and 6.2. Therefore not much to assist your rev capability. As joecar and RezinTexas suggest, you will see more "revability" by reducing your stroke. Just an FYI, with increase in revs demands more attention to the integrity of your valve train.
