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As I recall -way back when - on one of Tracy Crooks first
flights to Oshkosh and taking off for the trip back, his rotary oil pressure
dropped to 27 psi - that was it max pressure at any rpm.
Well, what to do - back in those days there were not
nearly the number of "rotary friendly" places to stop for a quick engine tear
down as there is now. Tracy elected to continue the flight at reduce rpm
and flew the rest of the flight back home to Florida - without any damage to the
engine.
The culprit as most will have guessed, was the infamous
oil "O" ring that sealed the oil path between the front iron and the aluminum
front housing. Within a few weeks of Tracy reporting on his incident and
the cause - I found myself looking at a 27 psi oil pressure reading as
well. Knowing that Tracy had make it over a 1000 miles, I was certain I
could make it back to my airport (still flying off my 40 hours at the time) from
my restricted test area.
The only down side I have heard about running with
the higher pressure oil is more wear on the oil pump - just heard, no
experience myself as I have always flow with the stock oil pump assembly - and
yes, I have removed the oil pellet and have the jets in the eshaft. My
typical flight oil pressure is 70psi although over the past years it has slowly
falling to around 65 psi.
I would consider replacing it, but waiting to see if the
16X is coming out in the next year or two - then I'll just replace the entire
engine.
Ed
Sent: Tuesday, June 07, 2011 9:42 PM
Subject: [FlyRotary] Re: My latest full power run
The stock early relief valves were all set at 71.9 pounds. Those can be
disassembled and a few washers installed under the spring to bring top pressure
up to whatever you want.
Racers like 75 to 100 pounds, the stock twin turbo FD is set at 115 pounds.
The .Weber jet mods to the oil spray nozzles in the crank are there to
preclude a piece of broken spring from finding its way into the oil pump. Also
to control how much oil gets sprayed into the rotors for cooling. Racing Beat
says a 200 main jet is about right. I use a 180 air corrector because I had a
lot of them and it fits better. I also use 100 Pounds from a dry sump pump and
do not want too much oil going into the rotors to limit foaming. If you do this
mod to a street engine, the idiot light will blink all of the time at idle. Too
big a leak in the oiling system. Once you have a few revs on hand the pressure
comes up a bit and the light goes out. The rotors foam the oil badly and that
reduces oil pressure and heat transfer (from air in the oil) . So if you have
this mod your idle pressure will be below normal, and you peak pressure will be
a few pounds light from oil temps and (bigger holes).
Once at top RPM, the only limit on pressure should be the relief valve
cracking pressure. You can check that with shop air pressure before assembly.
You can mod the early valves to get more pressure. You can use a heavier weight
oil. Racing oils have more anti scuff compounds and more anti foaming additives.
You can limit oil temps. You can buy an 85 or 110 pound valve from Racing Beat,
or make one yourself. Reinstall the valve with the drain horizontal to
help reduce foaming. That 68 pounds at full throttle and full temps is
plenty, bearing wise, just not as reassuring as 85 pounds. Be sure that there is
a restrictor in the pressure line to the turbo. The next time the pan is
off, just mod the valve up to 80 PSI and settle for 75 pounds at cruise. It
won't make any difference, but You will feel better, and we will feel
better.
Lynn E. Hanover
PS. There is a 3 rotor in a second gen body in my
shop.
-----Original
Message----- From: Chris Barber <cbarber@texasattorney.net> To:
Rotary motors in aircraft <flyrotary@lancaironline.net> Sent: Tue, Jun
7, 2011 6:52 pm Subject: [FlyRotary] Re: My latest full power run
I thought you were running a Renisis.
Sent from my iPhone
4
I have the mods too and I get 90 psi at that
rpm.
Rino
----- Original Message -----
Sent: Tuesday, June 07, 2011 10:21
AM
Subject: [FlyRotary] Re: My latest full
power run
Keep in mind he has the thermal pellet mod AND the carb jets
mod done to the e-shaft.. That could be a factor in oil pressure, especially
when warm.
I like the other numbers though..
Dave
On
6/6/2011 7:48 PM, Kelly Troyer wrote:
Chris,
Curious if your oil pressure has been
calibrated..............I personally would like to see
slightly more pressure at 6000+ rpm............Lynn jump in here and
tell me if I am off base
about this...............
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil
Manifold
"TURBONETICS"_TO4E50 Turbo
From: Chris Barber <cbarber@texasattorney.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, June 6, 2011 7:34:15
PM
Subject: [FlyRotary]
My latest full power run
See attached photo. I actually slid
just over 32 map at bit over 6200 rpm for a few seconds too with my IVO at
the flattest pitch on this ground static run. Just FYI.
Chris
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