To: | "Triumph" <triumphs@autox.team.net> |
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Subject: | Re: Lubricants |
From: | "David Brister" <david@dbrister.freeserve.co.uk> |
Date: | Wed, 10 Nov 1999 19:39:30 -0000charset="iso-8859-1" |
References: | <199911101334_MC2-8C81-7C94@compuserve.com> <3829C18E.D35548F9@powerbritish.com> |
Brian Schlorf wrote: Having had the luxury of pressurizing an oiling system without the oil pan on, I can say that the oil doesn't squirt out around the rods and mains under pressure, it just sort of oozes out and drips off, yet the gallery feeding the bearing registers some 50 or 60 psi. How are we defining pressure at the bearing? Is it at the end of the gallery just prior to the bearing, or is it were the oil is dripping out the bottom, or is it somewhere else in the middle? I think the pressure registered in an oil system essentially will be governed by the least restrictive orifice. If the oil gallery were punctured there would be no pressure registered. If all the white metal suddenly melted from the main and big end bearings, ditto. A good TR engine will register 70 psi at 2000rpm because the resistance to flow through the bearings, rockers, various bleeds and so on is such that if there were no pressure relief valve the pressure would be more than 70psi. The viscosity of the oil will determine the ease with which the oil can be pumped through the various bearings/restricting orifices so that has also a major effect on oil pressure. |
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