I had my cylinders deglazed and installed new rings. What (if any) are the break-in procedures I should follow with the new rings?
How long will they take to properly seat?
Thanks
it is the same as if the engine was off the show room floor. Just like the bike was new.
under 5500rpm for the first 500 miles.
Or there is always the other method......
Quote from: facepants on April 10, 2007, 09:49:24 AM
I had my cylinders deglazed and installed new rings. What (if any) are the break-in procedures I should follow with the new rings?
How long will they take to properly seat?
Thanks
You can all flame away, but, since it is rings only, not pistons and rings, the most critical thing to do is get the rings to seat. To do this you need high combustion pressure, i.e. large throttle openings. So you need to give it large amounts of throttle for short amounts of time, followed by closed throttle. This will allow the top ring to be forced against the cylinder, so it can seat. By keeping the periods of wide open short, you will not overheat the rings. By closing the throttle, you will rapidly cool the cylinder, thus keeping the rings cooler. I would not be as concerned about max rpms, not taking as long (in miles) as the manual would have you do for a new engine.
We used to break in race motors in about 30 minutes, so it isn't like you need athousand miles even for a street motor.
+1 on what Paul said.
I have had plenty of motor builders recommend the same. Breaking a motor in at the track was the best place due to the on/off throttle.
+1
Quote from: D-Day on April 10, 2007, 05:32:16 PM
By closing the throttle, you will rapidly cool the cylinder, thus keeping the rings cooler.
Do you mean just closing the throttle and not pulling in the clutch?
If so, does that mean engine breaking would cool the engine more than closing the throttle and pulling in the clutch?
why would you think just pulling in the clutch would cool the engine....????
Because I'm not pumping in and igniting gas at 9000rpms ?
Less fire = less heat... no?
i 'broke in' a mazda motor by immediately jumping small spillway grades, oh , and running over trash cans.
it only took about 20 minutes WOT for it to stop smoking like a tar kettle (rings seated, yay!).
the truck ran for another 120,000 miles this way, until the next owner WOT'd it into a traffic barrier.
all things being equal, if the stupid thing starts, runs and doesnt explode, why overthink the rest of it ? :thumb:
Quote from: facepants on May 05, 2007, 06:18:57 PM
Because I'm not pumping in and igniting gas at 9000rpms ?
Less fire = less heat... no?
What you are doing is pumping lots of cool air, plus at higher rpms and closed throttle, more oil is on the cylinder walls, helping to reduce friction and heat.