flyrotary@lancaironline.net Mailing List Archive

Thanks Finn. I should have mentioned the first thing I did was put a gauge to check the EFIS reported oil pressure. They were both reading within 2psi so I have taken it to be accurate to within about 2 psi. Thanks for the data. Steve > On 1 Nov 2024, at 9:23 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote: > > Startup oil pressure depends a bit on OAT. > Recent example: OAT 82, oil pressure 80 @ 2,700 RPM dropping as low as 50 @ 2,300 RPM after 80 seconds. > 67 @ 5,900 RPM during takeoff climb. (Over propped.) > Cruising along 68 psi @ 5,200 RPM, 62 OAT, 4,000' > > Sampling some logs I found 74 psi @ 6,500 RPM. > > I would say the relief valve is somewhere between 80 and 90 psi. Normally runs at 60 - 70 psi. > > Factory (unopened) Renesis 4 -port, I guess series 1. I don't know what happens when you replace the pellet with something else. > > I too had heard that the Renesis ran at higher oil pressures and foolishly ordered and installed a 150 psi oil pressure sensor. > > I guess 50 psi sounds a bit low at higher RPMs. Check the sensor for accuracy. > > Finn > > > > On 11/1/2024 8:17 AM, Stephen Izett stephen.izett@gmail.com wrote: >> Hi People. >> >> Could I pick your brains. >> >> I’ve been flying a Series 1 Renesis 4 port in the Glasair for some years now. >> I have always thought the oil pressure was a bit low but I’ve now got some concerns and would appreciate any wisdom. >> >> I’ve read that the Series 1 Renesis has lower Oil pressure than the previous rotaries and then the Series 2 had the pressure increased. >> Some have changed the rear iron relief valve for an older series with a high bypass pressure and then shimmed the front cover relief valve to enable a higher pressure. >> >> Ours has always had a cold start pressure (measured at the back iron oil input) of around 64 psi that drops to around 50 psi when warm. >> What I hadn’t realised was that it sounds like normal behaviour is for oil pressure to rise with RPM to a significantly higher value at say 7000rpm. Higher in earlier and Series 2 Renesis with the Series 1 at a lower peak pressure. >> Our engine doesn’t rise above that initial cold start pressure of about 64 psi and then not above 50 psi even at 7000rpm. >> >> If this is correct then it must have oil bypassing back to the pan somewhere. A rotary expert here says it sound like an engine with worn bearings. But it’s always been like this when I purchased it as one of the Mazda test engines and looked like new, >> Points that it could bypass back to the pan include: >> 1. O-ring / gasket between front iron oil passage to front cover. >> 2. Front Iron relief valve. >> 3. Rear Iron relief valve. >> 4. Bearings worn. >> 5. E-Shalf thermal delete leak. (I replaced the thermal pellet with Tracy’s Solid Aluminium units) >> >> I recall that on its first ever start we had a leak in the intake manifold and it burst into life at hight rpm and blew the oil filter seal out. >> This leaves me wondering about that front iron to front plate seal. Is this a gasket or o-ring in the Renesis Series 1? >> >> Is there any Renesis Series 1 engines out there and can I get your numbers and experience? >> I’m wondering is 50 psi at 7200 dangerous for the bearings, rotors? >> >> >> Thanks >> >> Steve >> Perth Western Australia >> >> Glasair Super II RG Genesis 4 port RD1C EC/EM >> >> >> >> >> >> >> . >> >> >> >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html