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Hello
The full flow system is basically to have a full flow oilfilter on the 356/912 engines. You also can add a external oilcooler but on a normal engine the stock coolingsystem works well enough.
However I always integrate a thermostatically full flow oilcooler.
The problem with the full flowsystem is that the cold oil can exceed over 30 bar pressure wich normaly bursts the oilfilter or a other weak link.
I normaly use the mocal thermostat on the filter wich has a open bypass to the rear so if the oilsystem has a overpressure bypass using the oilcoolersystem as expansionvalve ( some 8 m Oilines will soak the exedding overpressure )
The other way is a overpressurebypass wich has a bleedline going back to the case ( where the stock oilline was ).
Full flow systems major bebefit is that you have the dirt outside the engine and don´t pump it trough the oil galerys into the bearings.
If you go to improve the engine power output you have to make some alternations to the oilsystem to improve the bearing lubrication and do some other small changes needed for High Performance engines who have to rev much higher then the stock units.
Grüsse
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