More data on oil pressures going back in time
Hobbs T Off Lowest
27.4 69 48
34.9 69 48
36.9 70 46
46.3 65 48
59.8 66 49
67.7 68 47
70.6 65 35
So they look pretty consistent until the last
flight.
I haven’t checked the sender.
I did do a rewire of sender wiring. I will check
this however the pressure at Take off was within the range
of previous temps (Lowest of the previous readings)
Can anyone comment on the reasons and their
probability for lower oil pressure?
I believe the Renesis 4 port has only one oil
pressure regulation valve.
Cheers
Steve
<RX8-oil-engine-sys.jpeg>
Hi guys
I’ve just noticed that my oil pressure on the last
flight dropped lower than ever before.
At takeoff 7000 rpm with an oil temp of 71C (160F) it
peeks at 65 psi (according to the sender) then drops
off as Oil temp peeked at 100C (212F) with a pressure
of 35 psi.
During the flight as the oil temp dropped to 86C
(187F) the oil pressure was then 55 psi.
Pressure appears independent of rpm and closely tracks
oil temp.
I can’t recall the weight of the oil I’m presently
using.
Engine is a standard unmodified Renesis 4 port except
the mod to replace the thermal pellet in the e shaft.
Would appreciate your thoughts and numbers.
Steve Izett
IIRC, Tracy had similar symptoms when an O ring in the oil path
into the accessory case failed. Can't recall if it was in the
early 13B or the Renesis. It's been a long time, so my memory may
be flaky. Should be something in the archives.
Charlie
That was early on withe his first 13B, not his Renesis. Described in
detail in his conversion manual.
Actually I don't know if the Renesis has the same weakness at the
front cover to engine block interface.
With the (4-port) Renesis I'm also surprised to see 70 psi or less
after oil has warned up to 120F or more.
Highest I've seen in 80 psi and that is while oil is warming up
after starting engine.
Seen as low as 35 (typically 40) near idle.
Definitely seems temperature related.
This is a stock (early?) 4-port Renesis.
I thought I had read that the Renesis ran much higher (100 psi) but
that is not my experience. And I should have chosen a 100 psi
pressure sensor instead of the 150 psi one I use.
Finn