Re: Breaking in a newly overhauled engine.

Posted by gusc on February 07, 2005 at 20:53:00 from (63.97.117.47):

In Reply to: Breaking in a newly overhauled engine. posted by victor on February 06, 2005 at 20:22:14:

Josette and steve know what they are
talking about.

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.

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. Airplane engines do this. Once the rings set that will end, usually in less than a half hour..

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