Re: Full Flow Filter possibility-

Posted by Bob Carabbio on June 24, 1997 at 19:29:50

In Reply to: Re: Full Flow Filter possibility-
posted by Larry Jenkins on June 24, 1997 at 14:46:37

I haven't been able to get Mr Yoder's number yet-The local Food Lion didn't have any Hemmings this week.If you could send me the number It would help.
Your filter system is a kind of bypass type.
A True bypass system operates as follows:The oil pump is sized to produce much more oil than is necessary to maintain the oil pressure through the engine bearings, and a pressure operated bypass valve opens to bleed the excess oil to the sump through the oil filter to prevent excessive pressure.The problem is, if the clearances in the engine are loose, it's hot, and the oil gets thin, then the bypass relief valve stays closed, and NO oil gets filtered.
In the "A" there's no bypass route since all the oil goes to the front of the valve chamber with the only restriction being pipe size.Your system bleeds off some of the oil that would go up to the valve chamber, filters it, and dumps it back in where it's needed most - i.e. over the timing gears to fill the con-rod dipper troughs in the oil pan.

Parenthetically, There is some belief that the Spring inside the valve chamber that holds the drive gear down in its hole is a sort of emergency relief valve mechanism that allows the drive gear bushing to rise slightly under excessive oil pressure conditions and vents the oil to the valve chamber.It doesn't appear to have been designed to actually do that, though since rising far enough to vent pressure would also disengage the top pilot and allow the drive gear to move out of alignment with the camshaft.

Follow Ups:
Re: Full Flow Filter possibility- Larry Jenkins June 25, 1997 at 15:32:32(0)

E-Mail Comment to Webmaster