Break In Secrets by MotoMan

[BenR]

cannabolic Wrote:that was not what I meant...


The biggest factor is that engine manufacturers now use a much finer honing pattern in the cylinders than they once did. This in turn changes the break-in requirements, because as you're about to learn, the window of opportunity for achieving an exceptional ring seal is much smaller with
newer engines than it was with the older "rough honed" engines.

In addition, there is a lot less heat build up in the cylinders from ring friction
due to the finer honing pattern used in modern engines.

The other factors that have changed are the vastly improved metal casting and machining
technologies which are now used. This means that the "wearing in" of the new parts
involves significantly less friction and actual wear than it did in the distant past.


With that in mind ...

Quite correct, as i stated with the use of diamond honing and plateu finishing to reduce the Ra. With the onset of more advanced and accurate ring manufacture, harder materials, coatings etc etc.......the need to 'break in' rings isnt quite as pronounced as were starting with a much better surface finish that is already (or rather should be) perfectly round.

As for the rest of items 'wearing in' its quite correct aswell, heat treatment of better quality camshaft castings/billet cores results in a lack of a need to surface work the lobes, along with alot of people moving to radius path roller followers with increasingly aggresive cam ramp and flank profiles.

With all this in mind, there is even less of an issue to bed an engine and go straight to tunning and loading.