Proper Way to Break-in New Engine

[OrbitalEllipses]

The reason I don't believe in rpm limited break-ins is because of ring seating. If your piston rings never seat, that engine's never going to see full power and it might just pop one day. How do you get that sealing done? Engine braking. By the book break-in procedures wouldn't really allow for that...

I've just seen too many Subarus pop a ringland; granted they were turbo applications with a shitty tune in stock form and often modified. Plenty of us will be wanting more power and subsequently adding more power; if our tunes aren't trash and our pistons aren't glass we'll be fine. What are the odds of that, though?

[AzFranz]

Finally! It only took me 33 days...achieved at 1232 Arizona local time. It's hard to get your mileage in when you only live 2 miles from work. I followed the owner's manual but at times extended the rpm's past 4K. Sometimes 45 or 5, but not much more than that.

[driftartist]

I just bounced off the rev limiter for 3 mins straight and called it solid. Finished hooking up my nos and im good to go now. Lmfao jk guys

[7thgear]

Originally Posted by OrbitalEllipses

The reason I don't believe in rpm limited break-ins is because of ring seating. If your piston rings never seat, that engine's never going to see full power and it might just pop one day. How do you get that sealing done? Engine braking. By the book break-in procedures wouldn't really allow for that...

I've just seen too many Subarus pop a ringland; granted they were turbo applications with a shitty tune in stock form and often modified. Plenty of us will be wanting more power and subsequently adding more power; if our tunes aren't trash and our pistons aren't glass we'll be fine. What are the odds of that, though?

it's been mentioned more than a few times that engines are reved high and are put through the entire testing cycle before they leave factory.

[OrbitalEllipses]

Originally Posted by 7thgear

it's been mentioned more than a few times that engines are reved high and are put through the entire testing cycle before they leave factory.

Not to the same QC level as certain other types of engines; while some may think it has little relevance to our cars, Honda CBR motorcycles are put through a rigorous dyno test cycle at the end of assembly. More commonly you'll see that type of stuff done on high dollar cars (Pagani, Ferrari, etc.). I doubt Subaru does a full break-in and if they do, it doesn't matter if I rev the piss out of my brand new engine.