The VW cases used for aircraft are usually the dual relief cases. The foreword relief plug is the thermal relief, it has the longer spring, and channels the oil either to the oil cooler or back into the main oil galley based on the oil viscosity. The rear relief plug, has the shorter spring, and is the pressure relief valve. It channels oil to the galley and opens up when the oil pressure is too high. With this rear plug you can increase the back pressure on the spring itself by installing an aftermarket adjustable plug that you can buy form any VW outlet. It has a threaded hole and allan bolt with a lock nut on the outside, and an adaptor disk that interfaces with the spring and the end of the allan bolt on the inside. It also comes with a new crush ring. I've put one on my plane after I installed the new full flow oil filter set up and I can boost the pressure on a low idle after the engine and oil warms up. You should never use anything other that 30w oil in a VW.
Joe > Message: 5 > Date: Tue, 6 Oct 2009 14:38:30 -0700 (PDT) > From: phil brookman <pjb1234...@yahoo.co.uk> > Subject: KR> oil presure regulator > To: kr...@mylist.net > Message-ID: <970489.78329...@web24205.mail.ird.yahoo.com> > Content-Type: text/plain; charset=us-ascii > > i have a vw 1835 --and need to boost oil pressure a bit --i > notice there is a oil pressure regulator in the case how does > this work ---- ie does it blow off at 80-90 psi and allow oil > to go to the sump i was thinking of using 15w -40w oil > which would be a bit thinner than 20-50 but do not want to > lose oil pressure tia phill
