Running-in oil

[darrenjlobb]

Thing is you have to remember, modern engines (yes even xud/dw10 i would consider modern) have very fine tolerances from new / rebuilt, they simply dont require "bedding in" to the degree that old motors did, You used to literally end up with oil full of metal / bearing contaminants...you wont get this with these motors, or if you did, you have done something very wrong...

The way I see it is when you hone the bores out, its essential the rings are pushed out against this hard to allow them to "bed in", if they dont, they bores will smooth out and they will never bed in well, and who wants to rebuild a motor and have it breathe heavy for ever more..

I dont mean hold it on full bore for long periods / take it for a chronic hoon where the motor is under CONSTANT stress, but give it lots of bursts of boost / power to aid things.

Driving it like a "granny" under 3krpm for the first 500 miles is a recipe for disaster IMO however what alot of people will state is the correct way of doing things.

My old XUD used to run 60psi of boost, but you could put a sheet of paper over the oil filler at idle, and that was given a hard run in just like my other motors have.