Re: Motor Break-in

Posted by gusc on October 04, 2004 at 15:35:38 from (63.97.117.43):

In Reply to: Motor Break-in posted by Bubba on October 04, 2004 at 09:28:47:

Bubba,

The only thing that needs breaking in is the rings and cyl walls. The rings must have enough pressure to expand against the cyl walls to seat well and any no load condition will not do this.

Do not run the engine at idle for more than just a few seconds to look for leaks.

DO NOT EVER run an engine at high idle or high speed without a load. This will ensure that the rings never break in and that the cyl walls will have a permanent glaze that will result in poor compression and high oil consumption. I understand that there is one exception to this for racing engines. Never had anything to do with them so can't say one way or another.

The posters who advised you to put it under a medium load know what they are talking about.

Run it for about a half hour under medium load and watch the temp. Do not let it overheat for more than a minute or two. Sometimes new engines will get hot from blowby but only for a short time. Once the rings set that will end.

I have used this method on tractor, auto, truck and airplane engines and it has always worked. In the case of airplanes we pull them out to the runway, start them up, and take off. They are even harder to break in because they are air cooled.

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