Re: Multi grade oil

Posted by ED R on May 07, 2005 at 07:25:35 from (216.204.180.133):

In Reply to: Re: Multi grade oil posted by Sid on May 07, 2005 at 06:22:02:

A good oil pressure for any one engine is dependent on the volume of flow you have in your journal ports. If a engine has larger ports then the oil pressure can be lower. It only takes about 15 to 20 lbs of oil pressure to maintain a oil film in a .004 to .006 clearenced bearing under normal working condictions. A higher oil pressure and volume will take heat away better assuming you have the cooling cap. for the volume of oil. Higher oil pressure usally means your oil is flowing through reliefe valves which will heat it even more. And running a higher oil pressure takes more power. Cummings figured this out long ago, A new engine would develope about 40 lbs and thats all and 750,000 miles later you would have 35 lbs of pressure. Of more importance as far as oil is concerned is to keep it clean, It dosnt take long for dirt particals to start bumping and jambing in your oil film and start wearing bearings in most of the older tractors using large micron passing filters. Hope this helps

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