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How Long To Run In New Bearings?

sky30

By sky30,
in Engines & Forced Induction

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SilverECR33 Veteran

SilverECR33

Posted
Posted

people have different techniques and times, and depending on the clearances, condition etc. some guys say hard and fasst, after bed in go full power. otherwise some suggest bed in then wait 1,000kms while doing some loading processes before full power, but really,,.. if your unsure, call a tuner/engine rebuilder.

AngryRB Grand Master

AngryRB

Posted
Posted (edited)

im bit curious here, what would be the reason for replacing the big end bearings on a tired motor? ... would replacing them on a motor with highish km's be a good preventative measure against spinning a bearing or would that make you more likely to spin one if you have say 300kw's?

Edited by SliverS2
sky30 Mentor

sky30

Posted
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Posted

Blew an oil pump, had new bearings here so put them in while it was apart, bearings that i took out were in good condition.

Sumone must have a general rule for fresh bearings in a motor with pistons already run in. ??

10kms? 100kms ? 1000 kms?

SiR_RB Grand Master

SiR_RB

Posted
Posted

when i bought my r33 gtr engine and took the sump off to fit a tomei sump baffle, we changed the main and rod bearings just as a preventative measure

stock bearings and journals were still great, so standard size replacements went back in, i was advised to do 1000kms to "take the sharp edges off" before giving it hell.

JustinP Mentor

JustinP

Posted
Posted

My view for "running in" bearings, 0km.

Blew an oil pump, had new bearings here so put them in while it was apart, bearings that i took out were in good condition.

Sumone must have a general rule for fresh bearings in a motor with pistons already run in. ??

10kms? 100kms ? 1000 kms?

NoFigJamHere Enthusiast

NoFigJamHere

Posted
Posted

when i bought my r33 gtr engine and took the sump off to fit a tomei sump baffle, we changed the main and rod bearings just as a preventative measure

stock bearings and journals were still great, so standard size replacements went back in, i was advised to do 1000kms to "take the sharp edges off" before giving it hell.

Can you please let me know which brand bearings you used? I just want to avoid this brand that has these "sharp edges"... Most bearing failures are caused by detonation, failed oil pumps (no oil pressure,oil surge on track cars) and the thing you rarely get told about....... Foreign materials ie: DIRT.... and blocks,heads and every single part not being thoroughly cleaned...

GTSBoy Grand Master

GTSBoy

Posted
Posted

In a hydrodynamic bearing there is no metal to metal contact. The bearing interface is a layer of pressurised oil. Thus, there is no "wear in" period, because when the bearing is running metal to metal, it is destroying itself.

Nonsense question did not get a nonsense answer.

nick81xd Community Regular

nick81xd

Posted
Posted

ive always just gone easy for first 500klm doing low to mid load as the klms rack up. just so if theres any issues it can be noticed and shut off early rather then when its on song in high revs

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