Ring Seating Question

[AMXguy]

How long does it take to seat rings?   my all new rebuilt 440 has about an hour run time on it and today I had it out and noticed a bit of smoke on hard acceleration,  it seemed to get better the more I ran it, maybe it's even still burning oil out of the new exhaust system.

 I don't see any smoke at cruise speed, none at idle, and I shut it off hot and waited a bit to restart it a couple times, no smoke on start up.  so I don't think it's valve seals,  I've been there before.

The pipes look pretty clean. any suggestions on what this could be ?  ring seating is all I can come up with but that's just a wild guess. 

[xtopfuel]

of course it  depends on ring material, a common myth is to baby an fresh engine and should be opposite, after cam break in a few hard passes to redline 1st, 2nd your rings are seated

[Chryco Psycho]

it can take 300+ ms to fully  seat +you have assy lube is valve guides etc still burning off

[AMXguy]

Well that could be ,  all I've done is the break in routine and another 20-30 minutes.

 I always run a little Marvel Mystery since I use 25% AV100 LL  ,  I doubt that is causing the smoke but  I wonder if that's not a good idea until the rings are broke in?

Cast rings by the way if it matters.

[xtopfuel]

Just curious how we put miles on a break in

[rUNCHARGER]

After about 10 miles I give it some full throttle bursts to around 4500 or 5k in second gear to load the rings. I don't over rev it but I don't baby it. I run them harder than normal for the first few hundred miles. You'll get a million different opinions on it.
Matter of fact I just rebuilt my Twin Turbo Stealth engine. The last engine was rebuilt (previous owner) but it never seated the rings and used oil. It takes days not hours to change an engine on one of these cars. I pulled the lever at 7000 the first time I drove it, not taking chances this time and it's not using oil and runs great.

Sheldon

[xtopfuel]

exactly, nothing worse than rings not seating, you only get one chance

[Oldschool]

I have seen stubborn chrome moly rings take a thousand miles to get fully seated. Sometimes, patience is needed....   

[HP_Cuda]

 

[xtopfuel]

True but more the reason to seat them hard also many make mistake of not installing moly rings dry enough

[Strawdawg]

If the rings were moly coated, they should seat with with hard run assuming the hone job was done properly...some times that is a big assumption.

[xtopfuel]

Exactly

[Aussie Challenger]

The secret is to get as much combustion pressure behind the rings to force them out against the bore without damaging the bearings which take a lot longer to bed in.
I have always taken a manual or stick trans car up to around 35mph and in top gear planted the accelerator allowing it to get to 45 - 50mph then back off and repeat a couple of times.
Engines with larger cams I have shifted these speeds up a little.
For an auto disconnecting the kick-down then doing the same as a stick but applying the brakes slightly, don't forget to reconnect the kick-down.
Over revving the engine in the critical break-in period damages the rings and bearings.

[jimynick]

I have seen stubborn chrome moly rings take a thousand miles to get fully seated. Sometimes, patience is needed....   

  Ain't that the truth!? I put a set of chrome rings in a 340 I rebuilt back in the 70's and they NEVER broke in.