owen_the_soyboy

wicked post

sik_tC

correct me if im wrong, but the 10 psi rule only works with a 5w20 oil, I THINK.


I KNOW
when im gunning 4 grand to 3,500 on the interstate in my car its right on 60 but that IS with 10w30 oil

i think the different weights of the oil changes the PSI it runs at.


not 100% sure just read it somewhere.

string

Of course what you have said happens in many cases, but the term "spinning a bearing" obviously comes from the extreme case where the bearing literally spins with the crank; damaging not only the bearings. Wearing down a bearing is simply that, wearing a bearing.

mcmotors

you are correct, but the term "spun bearing" is used so loosley... Someone refering to a "spun bearing" could have excessive bearing wear and what probably should be refered to as a "rod knock", but I don't ASSume anything.

Wes V had the best and most proper answer.

On a ligher note, this thread is funny!

kyral

Is there any extra precautions one can take when rebuilding a motor to help prevent this?

flush_EJ1

I figured this thread was worthless without pics of said spun bearings.

Here is a couple from a 3SGTE engine before I built it. This one in particular did spin in the connecting rod. The piece at the bottom is half a bearing. These are the only pieces I have. I just threw the rest away this weekend but it was carnage. Every single bearing was either smashed or broken. the crank on #4 was also worn away to .03"







Here are few engine building tips to help prevent a spun bearing.

• Cleanliness. Build the engine in as clean an area as possible. There is a reason factory/high end engines are built in clean rooms.
• Build the engine slightly loose and pay attention to torque specs.
• Dont damage the crank when installing the pistons/rods.
• Always replace the water and oil pump.

B20vREX-LD

It's when the bearing around your crank spins and typically makes a knocking noise.

Got traction

spun rod bearings eventually lead to a window in the motor

TheToaster

iTrader: (1)

Isn't It called a babbitt bearing?