correct engine break-in procedure - nurse for 100miles only!

[drummerboy]

Many people have talked about the importance of bedding the rings. They say it must be done as early as possible in the engine's life. And they describe varying RPM as well as driving hard and decelerating as part of the procedure. Keep it simple - just don't take it to the track for long WOT sessions too early. Everything else is fair game (after oil temp is up to 170-180).

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[Ahung12]

Just picked mine back up with the new engine. How should cool down be handled for the first 100 miles? I got it warmed up to 185, then did the 3rd and 4th gear varying throttle applications, and temps were at 207 by the end. Normally I take it easy for the last few miles and let temps drop to at least below 190, then park it. But that would require a period of just relaxed/very low throttle application; does that defeat the purpose of bedding the sleeves/rings, or worse yet do them harm?

 

[Postal Bob]

In a nutshell, I do a 1k break in. During the first 500, I do a few gentle pulls to no more than 3k-4k rpms, followed by deceleration, while keeping in gear as long as possible. The varying speeds while in gear helps seat the piston rings.
Then from 500-1k miles, I increase the rpms to the 5k-6k range. After 1k miles, its all out to the limit.

 

[Ahung12]

In a nutshell, I do a 1k break in. During the first 500, I do a few gentle pulls to no more than 3k-4k rpms, followed by deceleration, while keeping in gear as long as possible. The varying speeds while in gear helps seat the piston rings.
Then from 500-1k miles, I increase the rpms to the 5k-6k range. After 1k miles, its all out to the limit.

Do you let the engine cool down before shutting it off?

 

[Postal Bob]

Do you let the engine cool down before shutting it off?

No, why? It's not like running on a track. When I get home, I do open the hood, and let the engine bay cool down before I hook up the battery tender, or put on the car cover.

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