garygnu

dose a iron valve guide wear better or less than a bronze valve guide when using a stock ls rocker arm?

studderin

iTrader: (28)

this isn't really asking the right question. But iron is harder then bronze so should wear less, in genral like your asking.

Now will both last a long time, setup with the right valvetrain geomety? Or can both get destroyed really fast if setup wrong?

garygnu

if the valve train geomety is set up right.

Gordon0652

iTrader: (4)

Reason they are Bronze is because they wear before your expensive valves like a bushing. You can replace them with iron but the coefficient of friction is higher, more wear...

one fast zo6

iTrader: (490)

i heard that if you have a roller tipped rocker arm then you want a bronze valve guide.

garygnu

I think you mean if you have bronze guides you need roller rockers.

bww3588

iTrader: (49)

there is no friction really...the valves dont ride on the guide...

Gordon0652

iTrader: (4)

Then why do the guides wear out over time? Natural break down? lol

bww3588

iTrader: (49)

lack of lubrication, carbon build up inside of them taking the oil cushion away. you usually have about .002 of oil clearence in the valve guides. about the same as a bearing.

i didnt really mean there is no friction, what i ment to say was the difference in materials between bronze and steel guides is not going to create less or more friction.

quews6lime

iTrader: (22)

less!!!!!!!!

Mike454SS

iTrader: (4)

Yeah, friction is much more a function of surface finish, proper geometry and proper oiling than it is material.

They wear over time due to the geometry not being perfect, or the surface finish/stem shape/guide shape having flaws that result in metal-metal contact despite the oil film.