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Re: OK ,I was Mad and was looking for someone to B
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Posted by Tom Windsor on August 25, 2006 at 14:55:52 from (205.188.116.133):
In Reply to: OK ,I was Mad and was looking for someone to Blame posted by Magman on August 25, 2006 at 10:53:05:
I have rebuilt A/C engines for a long time beginning back in the Airforce in 1962.
These engines are designed to run wide open or thereabouts all the time. To Break in one, I mount it, pull it to the end of the runway, fire it up and go wide open till its broken in. You will see the temperature indicating higher than ordinary operating temperature. You will also see the temperature drop on each cylinder as the rings seat. (these engines are air cooled) You have got to be careful with the oils you use on break in. An oil with too low a viscosity can shear and lose film strength at high temperatures. Polimers are added to oils base to prevent it from thinning as it warms up and to prevent breakdown of the oil. On a good rebuild, you are going to have more heat. To assure myself that I have the best oil in there for the break in, I use synthetics as they give high film strength. It cost more but I have not had any adverse results due to oil breakdown. Also, the radiatior and the circulating oil should have been cooling this engine down. Have you checked the cooling system and the oil circulating system on the engine? The point is, you may have had a combination of these problems that were feeding off each other.
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