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