While a by-pass filter contribution is limited, it is still significant because of two reasons: 1. It is the only way to catch and remove particles smaller then 300 microns from the oil; 2. It traps water and other sludge and keeps it out of the sump. As long as the oil pump is in a reasonable condition, It would not effect the oil pressure. The reason is that in normal operation the pump pumps much more oil then required and the surplus is thrown back to the sump by the oil-pressure control valve (ball and spring). Therefor at worst less surplus will be returned to the sump by the valve.
You can see here http://wp.me/pXLKy-21U how I had cleaned the oil galleries on a recent engine rebuilt – and yet I am using the oil filter.
correct oil?
-
Castellated nut
- Posts: 17
- Joined: Thu Sep 03, 2009 9:22 pm
- Location: Shropshire
Re: correct oil?
David Mosely did a very neat bypass filter conversion using a modern "Kleenoil" filter, though the pictures in his thread have expired.
The traditional reason for not using a multigrade oil was that in an old dirty engine that had been run for all its life on old-fashioned monogrades there would be a lot of sludge built up which would be disturbed by the detergent in multigrade. In a clean engine it should be perfectly OK to use a 20/50 multigrade, and most people do.
The traditional reason for not using a multigrade oil was that in an old dirty engine that had been run for all its life on old-fashioned monogrades there would be a lot of sludge built up which would be disturbed by the detergent in multigrade. In a clean engine it should be perfectly OK to use a 20/50 multigrade, and most people do.