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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
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