Chris,
A few Questions..................What size are your hoses (-8 , -10 , etc) ?............Does oil leaving
the rear oil cooler routed 15 ft to a standard aircraft oil cooler ?...........Which hose has failed or
is leaking ?.................If it is the 15 ft hose to the front cooler and is this cooler in series rather
than parallel to the rear cooler I am guessing that the front cooler is restricting oil flow causing
higher than normal pressure...............The standard Lycoming type oil coolers are not capable
of the the oil flow (gals per minute) needed for a 13B without severely restricting flow and the
resulting increase of oil pressure in the inlet hose.............Also the hose can be restrictive if it
is too small for the 15 ft run...............IMHO
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
Ouch, you beat me to that one. I was waiting for the hair on the back of my neck to lay down before I started typing.
There is no pressurized oil allowed inside the cabin of a race car. That white cloud of hot oil from a leak is explosive, and as powerful as gasoline. Even for oil pressure gages, you need a restrictor at the engine end of the pressure gage line or better yet an electric gage and sender. For fuel pressure an isolator with cold glycol in the message line, or an electric gage and sender.
I would convert those oil lines and cooler to engine coolant with an automobile shutoff valve on each hose. Light and cheap, one cable could cycle both valves. So in the event of a leak inside the cabin, the coolant loop could be cut off with little loss of coolant. The heater will perform much better with coolant in it rather than oil. Oil absorbs and releases heat poorly. Not the case with a water based coolant.
That would shorten the oil pressure lines to near normal, and remove what is causing the higher than normal pressure at the filter stand. The front pressure relief is set at 144 pounds. I bet the relief is standing open to some extent, the whole time the oil is warming up. At the other end of the oil pressure loop is the stock oil pressure regulator and it is not going to open until it sees 71 pounds or whatever it is set at. Once off idle (about 600 RPM) the stock pump has some excess capacity and could support such a situation. So resistance to flow by the long runs and the cooler could be producing a huge amount of pressure. If you are measuring oil pressure on the engine, you would not see that pressure on the gage.
So long as the engine is at idle or low speed this may not have been a problem. If the engine were to rev up a bit oil pressure could have gone to a bit over 144 pounds while showing 71 pounds on the gage.
This is peculiar to Mazda, where the regulator is at the end of the system rather than inside the pump where it is supposed to be. Similar to FI reulators on the end of the fuel rail, that can blow apart and set the engine on fire.
This must be a Renesis. The "O" ring would have blown out of a 13B.
Lynn E. Hanover
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