Lets duscuss that restrictor- NOT in modern engines.


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Posted by Chris Case [107.201.30.209] on Wednesday, July 23, 2014 at 10:23:01 :

In Reply to: Re: spin on filter posted by Daryl in Oz [58.178.155.198] on Tuesday, July 22, 2014 at 19:30:16 :

The oil bypass valve in the block prevents excessive flow to the filter, starving the engine. It only opens far enough to control excess pressure- it maintains pressure to the internals. It only opens when there is so much flow to the internals that it would dump back into the pan. Except it works in two stages- first it allows oil to the filter, then if pressure gets even higher, it dumps into the pan. With the restrictor, it only dumps to the pan sooner.

The only reason for the restrictor that I can see is to slow down the flow through the sock full of wood chips that acted as the filter in the old days.

Even with the convenient spin on filter, it is still a by-pass system. The oil that gets filtered is only what would have been dumped into the pan to relieve pressure. And now it gets filtered, and then dumped into the pan.

There is also no point in pre-filling the filter since the air in the empty filter will only get to the pan, NOT the internals.

The big blocks had a filter mount on the side of the block. Wasn't it full-flow? Spin on? Restrictor?



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