Rings not sealed???
Racer
Joined: Feb 2008
Posts: 497
Likes: 0
From: Streator Illinois
Time to ask some very specific and detailed questions about the build. Rings seal almost instantly if they're of proper type and the bore is correctly machined - as was previously noted.In fact, except for cam/lifters, which is only an initial break in anyway, I don't know of any moving engine part that doesn't take at least a few hundred miles to wear in properly.
Yes, you can take a new engine with only minutes run time and flog it mercilessly without breakage, but that doesn't mean all moving parts are worn in completely. And yes, this is my opinion but it is based on research, lubrication data, discussions with machinists, and many years of engine experience.
Terry
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
The KB hypers require large ring gaps. Otherwise the rings butt and break the ring land on the piston.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
If you ever get the chance to break in an engine on a dyno you'll hear it happen. I can't think of a single shop that does dyno break-in that doesn't basically let the temps stabilize and finish the cam break-in if a flat tappet, and then start making power runs. The engine analyzer tells you what's coming out the pipe, and the seal happens within a few minutes with moly rings.
Driveshaft's made the right call with the pistons as well - virtually always too-tight ring gap as the KBs require a wider gap than commonly used.
