does anyone have experience with stock ls bushed rods and a higher rpm b18b bottom end? would i be safe turning it to 8500? will be 12:1 with forged pistons

 

Factory rods are plenty strong, but you will need ARP rod bolts.

 

but of course...

 

are stock B20 rods as strong?

 

Same rods.

 

Alot of people dont realize, how strong b20/ls motors are..

Each has their weaklinks but in the end, they are running the thickest and strongest cranks and the rods can hold up very well
Upgrade your rod bolts and you should be set.
8k rpm is the max i'd take them, because then you start running into piston spead issuses. depending on weight of pistons, height of your dome, and everything else.

I've seen stock ls/vtecs that i've tuned last awhile tuning to 8200rpms but i wouldn't recommend and i've only seen those last for only a few years before something gave.
Upgrade your rod bolts first, and then dyno, see where you make your power.. no need to rev the **** outta anything until you know whats up.

 

i meant like effectively as strong because with a larger bore there is more side loading forces and what not.

 

heh, its not side loading you should be worried about with rods...
but a bigger bore does mean soemthing.

 

Bigger bore usualy means heavier piston. Then you should be concerned with rod and bolt stretch.
Bigger bore also means more surface area on the skirt usually. Increases friction but spreads the "side load forces" across more area.

 

i have a ls crank and rods in my gsr with arp rod bolts and i rev it to 8500 with no problems..just put arp rod bolts and u will be good to go

 

Is that true? There is more side load with a larger bore? I thought that the R:S ratio dictated the amount of side load. Aside from the piston being heavier does a larger bore=more side load?

 

bore has nothing to do with what he is asking..a bigger bore will not affect the rods...just put arp rod bolts

 

i ran LS rods with Arp bolts in a 85x89, 13.7:1 compression, wiseco pistons. spun it 9200 rpm and went 12.0@113. engine lasted 4500 miles before an omnipower valve broke off. rods never had a problem. i retanged them for gsr bearings and ran them backwards also.

 

I wasn't asking if bore had anything to do with the rods. I was asking if it affected the side loading of the walls. Aside from the fact a larger piston would most likely weigh more. I was under the impression that the R:S ratio was what determined the amount of side load. I was asking if that was a true statement.

 

Man... get good springs. rev till 10k. be happy.