i need once again opinions on rods for a ka-t, stock polished or stock un-touched

[ryan hagen]

so i read modifeid magazine build up and they ground off the casting marks from their rods, and then polished them, i did that to a couple of my spare rods, making sure to not take off any more than the casting marks and ruff stuff, and it looked pretty decent, now keeping them balanced i still have to do but i need to ge thte scale next week, but i m wondering if maybe i cut down on the strength of the rod, either way i will get them cryo treated also. but it just seems to me like hte casting ridge could ad soem strength, but i donno cause it s also a stress riser. so i m not sure that the casting would help it at all. basically jus tlooking for soem further advise before i get to a stage where i cant easily turn back.
so let me know what u guys think, the guy that races alot of stuff at nissan said it was a good thing to do to the rods cause it cuts down on windage also.

so here are my choices:

stock cryo treated with arp bolts
polished/lightend cryo treated with arp bolts

[Jeff240sx]

I know DIY is the way to go, but put down the tools and step away from the rods.
Seriously.. there is a reason that balancing a set of rods is a couple hundred dollars, as well as micropolishing. A shack and sandpaper won't do anything good imo.
-Jeff

[BadMoJo]

Just buy a set of forged Titanium rods instead.

[ryan hagen]

Just buy a set of forged Titanium rods instead.


if i wanna get the motor done next year, but anyways, im not micro polishing or any thing just trying to get rid of stress risers, i think i ll just have them shot peened then cryo treated and they should be good what do you think, and i dont use sand paper, i use a dremel and drill most of the rods arent changeing taht much weight wise, just they are lighter from the casting being gone, and they dont differ in weight much yet

[Ghettokracker71]

polished/lightend cryo treated with arp bolts

:bigok:

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[Maxtype 240]

Cryo treating is real cheap. I was quoted $400 for my entire motor. Rods should be cheap. Have the rods professionally balanced.

Jesse

[S14DB]

MicroPolishing is for the bering surfaces.
Grinding off the casting marks will reduce stress points. Having a pefectly smooth rod will create a surface tension effect that can increase cracking. Have them Shotpened to ruff up the surface of the rod and make it stronger.

[Ricer240sx]

where were u quated at??? i wanted to have my block crank and rods cryo treated along with a couple buddies of mine!

as u can see i say go cryo treated rods :)

[ryan hagen]

MicroPolishing is for the bering surfaces.
Grinding off the casting marks will reduce stress points. Having a pefectly smooth rod will create a surface tension effect that can increase cracking. Have them Shotpened to ruff up the surface of the rod and make it stronger.


qouted $20 for 4 rods, thanks for that input i d have to say thats what i ll do, yah i knew micropolishing was for the bearing surfaces, but jeff240sx said that was what i was doing, i went down to 120 grit on what i started...... far from micropolished.