From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Genesis Series 1 Oil Pressure
Date: Sat, 2 Nov 2024 16:14:55 +0800
References: <list-3674393@lancaironline.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-3674393@lancaironline.net>
Message-Id: <2D689410-8D9A-4B5C-BCB8-F089E3F20004@gmail.com>

Hi again Finn

A qualification. Mazda used a lower oil pressure for the Renesis Series =
1 than previous engine series, and then went back to higher pressure for =
the series 2 Renesis.
My understanding is that the thermal pellet in the front end of the =
Eccentric Shaft, when cold is open allowing the oil to dump into the pan =
rather than when warmed up it closes and the oil in the eccentric now =
squirts into the rotors cooling them.
I believe this is about emission control at startup and that for racing =
and our use, better to delete this thermostat and block permanently this =
path meaning oil is always cooling the rotors.=20
If the thermal pellet fails, it does so open and so stopping the rotor =
oil cooling. Not a good thing and can cook the oil o-rings on the rotor =
sides.

Open to being corrected.

Steve


> On 1 Nov 2024, at 10:50=E2=80=AFpm, Stephen Izett =
stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>=20
> Thanks Finn.
>=20
> 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.
>=20
> Steve
>=20
>=20
>> On 1 Nov 2024, at 9:23=E2=80=AFpm, Finn Lassen =
finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
>>=20
>> 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'
>>=20
>> Sampling some logs I found 74 psi @ 6,500 RPM.
>>=20
>> I would say the relief valve is somewhere between 80 and 90 psi. =
Normally runs at 60 - 70 psi.
>>=20
>> Factory (unopened) Renesis 4 -port, I guess series 1. I don't know =
what happens when you replace the pellet with something else.
>>=20
>> I too had heard that the Renesis ran at higher oil pressures and =
foolishly ordered and installed a 150 psi oil pressure sensor.
>>=20
>> I guess 50 psi sounds a bit low at higher RPMs. Check the sensor for =
accuracy.
>>=20
>> Finn
>>=20
>>=20
>>=20
>> On 11/1/2024 8:17 AM, Stephen Izett stephen.izett@gmail.com wrote:
>>> Hi People.
>>>=20
>>> Could I pick your brains.
>>>=20
>>> I=E2=80=99ve 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=E2=80=99ve =
now got some concerns and would appreciate any wisdom.
>>>=20
>>> I=E2=80=99ve 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.
>>>=20
>>> 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=E2=80=99t 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=E2=80=99t rise above that initial cold start =
pressure of about 64 psi and then not above 50 psi even at 7000rpm.
>>>=20
>>> 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=E2=80=99s 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=E2=80=99s Solid Aluminium units)
>>>=20
>>> 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?
>>>=20
>>> Is there any Renesis Series 1 engines out there and can I get your =
numbers and experience?
>>> I=E2=80=99m wondering is 50 psi at 7200 dangerous for the bearings, =
rotors?
>>>=20
>>>=20
>>> Thanks
>>>=20
>>> Steve
>>> Perth Western Australia
>>>=20
>>> Glasair Super II RG Genesis 4 port RD1C EC/EM
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>> .
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>> --
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:   =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>=20
>>=20
>>=20
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
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>=20
>=20
>=20
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