HuntingPudel
Well-Known Member
- First Name
- Steve
- Joined
- Mar 23, 2021
- Threads
- 66
- Messages
- 8,314
- Reaction score
- 9,999
- Location
- Bay Area, CA
- Vehicles
- 2021 MME GT-PE, 1979 Fire-Am, 1972 K/5 Blazer
- Occupation
- Engineering
ICE break-in is mostly for the ring to cylinder wall contact. Even if the block is honed with a torque plate the compression rings will not have a perfect seal on the cylinder walls. The objectives on ICE break-in are to wear down the high spots in the cylinder walls and match the ring OD to the bore ID, while not glazing the cylinder walls or ring faces. This can be accomplished by running the engine under moderate to mildly heavy load at medium engine speeds. On throttle for a little while, then off throttle for a little while. The off throttle time creates a bit of vacuum in the cylinders, pulling more oil toward the rings to help flush out wear particles and aid in cooling (reducing the chances for falling and glazing). The on throttle time creates pressure which helps push the rings out against the cylinder walls.
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