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chris_seven chris_seven is offline
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Join Date: Feb 2004
Location: UK
Posts: 2,231
Quote:
Originally Posted by 82 sportsc View Post
higher pressure forces Oil In gaps and moving parts that have tight tolerance .

With out pressure wouldn't we just have oil laying on the outside of parts ?

Frank
Not really you only need pressure to allow oil to enter the bearing - once the oil is in place the separating forces are created by the rotation and the pumping action of the bearing itself.

http://kingbearings.com/files/Engine_Bearings_and_How_They_Work.pdf

I would tend to agree that Porsche must have some reasons why the changed design and altered the ratios of scavenge and pressure as they changed the engine.

I am just not convinced that a 2.2T needs a Turbo or GT3 Pump even when it is modified to with E Cams and S pistons and this is what is being prom0ted in the UK at least. For the majority of engines the standard pumps seems to more than adequate.

I don't understand all of the reasons for the changes that Porsche made and not all of them seem entirely consistent as the flow requirements don't change much.

I really do fail to understand how porting a gear pump increases flow and without specific test data I will remain sceptical.
Old 09-24-2017, 12:21 AM
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