From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Date: Fri, 1 Nov 2024 09:23:13 -0400
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Subject: Re: [FlyRotary] Genesis Series 1 Oil Pressure
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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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> .
>
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>
> --
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