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-   -   Break in time? (https://classracer.com/classforum/showthread.php?t=43528)

art leong 09-29-2012 07:42 PM
Break in time?
 
I installed new rings in my motor. They are Gas ported moly coated .038 D shaped top ring. I'm used to .031 dykes rings with a "mirror" finish on the walls. With this setup just starting the motor and idling broke the rings in.
Now I'm using a rougher finish, and different ring (described above). Do I need to cycle them in before switching to synthetic oil? Or can I just use the dyno oil in the garage. Then change it and go run it?

randy wilson 10-02-2012 10:02 AM
Re: Break in time?
 
Yes, run a round or two, or put some garage time on it before you change to synthetic oil.

BlueOval Ralph 10-02-2012 11:42 AM
Re: Break in time?
 
Art
Dig out your old Direct Conection manual in the engine section there was a breakin write up as I remember

art leong 10-02-2012 12:07 PM
Re: Break in time?
 
Quote:
Originally Posted by BlueOval Ralph (Post 349794)
Art
Dig out your old Direct Conection manual in the engine section there was a breakin write up as I remember
I know how we used to do it. But that was with a .031 Dykes (nothing like the DC manual). Now I'm running a gas port ring. The last time I did the motor I was using dino oil to race with.
Now I want to switch to synthetic after the rings seat.
What I'm planning on doing is to run the engine at about 2,000 for about 20 minutes varying the rpms slightly as the time passes.
Then change the oil and go racing.

BlueOval Ralph 10-02-2012 12:48 PM
Re: Break in time?
 
Engine should have some type of load on it. It's not much different with dykes or barrel face rings with gas ports.

Ed Wright 10-02-2012 03:06 PM
Re: Break in time?
 
Sure wouldn't hurt a thing to just go race it with Joe Gibbs BR30 break in oil. Some guys run it all the time in bracket mode. I doubt they will seal up real well sitting in the garage.

randy wilson 10-02-2012 03:54 PM
Re: Break in time?
 
It would be better to run it, but, I have let them run off and on for 10, to 20 minutes, and had the same results in leak down, and performance. If you have a good round cylinder, and proper hone, it has worked for me, just saying. Good hone breaks in rather quickly.

art leong 10-02-2012 05:57 PM
Re: Break in time?
 
Quote:
Originally Posted by randy wilson (Post 349838)
It would be better to run it, but, I have let them run off and on for 10, to 20 minutes, and had the same results in leak down, and performance. If you have a good round cylinder, and proper hone, it has worked for me, just saying. Good hone breaks in rather quickly.
That's what I've been led to believe. Going to make some noise right now.

art leong 10-02-2012 06:44 PM
Re: Break in time?
 
Got it running. Ran it for 15 minutes at between 1200 and 3000 mostly 1800 or so.
Letting it cool to ambient and going to repeat.
Sounds fine so far. No smoke or eye burning (richness)


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