High Tech Question-Rods/6.125 vs6.200
09-06-2003, 08:02 AM
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High Tech Question-Rods/6.125 vs6.200 If used within the same motor only change rod size and piston pin location.Bore size of 3.905,stock stroke.
What exactly would the change from a 6.125 rod to a 6.200 produce.Faster revs,more HP ?
What exactly would the change from a 6.125 rod to a 6.200 produce.Faster revs,more HP ?
09-06-2003, 01:50 PM
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Re: High Tech Question-Rods/6.125 vs6.200 It will give u slightly faster revs due to the piston being .075 of an inch shorter and weighing less but it also helps with sideloading of the cylinder walls at high rpm, a better rod to cylinder wall angle which means its easier on the engine. The rod has a straiter angle.
09-06-2003, 01:59 PM
#3
TECH Senior Member
Re: High Tech Question-Rods/6.125 vs6.200 Lighter piston
Lower max piston velocity
Less side loading of the piston
Longer dwell time at TDC
These are all good things.
Lower max piston velocity
Less side loading of the piston
Longer dwell time at TDC
These are all good things.
09-06-2003, 02:01 PM
#4
Re: High Tech Question-Rods/6.125 vs6.200 well, this is only .075", so nothing that I could notice.
But Anil8r pretty much summed it up. A greater rod:stroke ratio creates less side loading on the cylinder, and literally allows the combustion to push the crank more in the right direction. On the other hand a smaller compression height (distance from the pin to the piston top) makes for a weaker piston (not *really* as much of an issue these days in these motors), and also the pin can eventually intrude on the oil ring.
In this case, the difference is so little that I would look to see if any of the pistons are off-the-shelf and not custom. That would save you money. All else equal, longer rods are better.
chris
But Anil8r pretty much summed it up. A greater rod:stroke ratio creates less side loading on the cylinder, and literally allows the combustion to push the crank more in the right direction. On the other hand a smaller compression height (distance from the pin to the piston top) makes for a weaker piston (not *really* as much of an issue these days in these motors), and also the pin can eventually intrude on the oil ring.
In this case, the difference is so little that I would look to see if any of the pistons are off-the-shelf and not custom. That would save you money. All else equal, longer rods are better.
chris