Hi Guys!
How to break in a new piston/ring cylinder wall?
Teory is:
Ringtension only skrab the oil and let no oil in combustion chamber,not seal.
The real seal is when the gaspressur go over the top of the ring and gets behind it and force it outward against cylinder wall.
New rings are not ?perfect? and have to worn in quite a bit in order to seal all the way around the bore (360*).
New cylinder have honed crosshatch pattern who is like ?peaks? and have to wear down to get proper seal.
So, if you want to have a engine who has a ?works? sound and power and no ?moped? with 10% lower hp.
RUN IT IN HARD FROM FIRST START!
Why so?
If the rings aren?t forced against the walls soon enough, they?ll use up the roughness before they fully seat around the bore. And the force is from air/gas mixture ,so you have to ?open throttle? to get enough of pressure for proper ring seal.
This is my break in:
Go to a racetrack if you can, the best break-in enviroment.
Warm the engine up completely.
Go for a easy lap and then into pit and turn off the bike for check-up leaks.
Then you go for a 10-15 min practice session.
Stop and let it cool down for 15min.
Do it over again.
And again.
Now race ready!
Why is the race track the best enviroment to break in, because of the combination of acceleration and decelerartion.
So with a birst of accelerartion followed by deceleration for short times make the rings press good against cylinder wall and let it cool nice afterwards by deceleration. THIS is the best break in procedure you can have on you new rebuild topend.
Never ,never start the engine in garage and not followed by this loaded break-in after a good warming up!
You will get a poor seal and slow engine.
Just my 2 cent !
//doordie