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On 5/23/2014 6:57 PM, steve Izett wrote:
Hi guys
We are just finishing our Glasair SIIRG with a Renesis 4 port.
Started her up after finishing main wiring and she burst into life. (without prop at the moment).
~70psi oil pressure oil and water temps building. Ran it for 5 mins or so before shutdown not wanting temps above 200.
We worked out that if we lifted the tail up we could get some more air out and water in.
I have some questions/concerns:
1. Gurgling sound emanating from oil filler/breather with white substance on the oil dip stick. Concerned water may be getting into sump. What are the symptoms of o-ring failure? So much to learn re rotaries.
2. If we do need to tear it down, any great sources of how to go about it. Remembering years ago seeing Bruce T had a video?
3. We are working on an expansion tank design and wondered if someone could share the important elements of a good cooling system design. Looking at photos of other aircraft I’ve seen lines to expansion tanks from A. Rear iron port. B. Radiator tank top. etc. A. Is height of tank significant? B. Volume required? C. How much air should be left in the tank? D. Cap style?.
So much appreciate having this list.
Steve Izett
Perth Western Australia
Hi Steve,
Len Hanover has posted a drawing of a 'swirl pot' to do water/air separation. I'll try to find it on my computer, or you can search the archives.
I've attached a page from the RX-8 service manual that shows most of the connections to the tank. IIRC, the port on top of the flywheel iron went to a jacket on the intake manifold, & I can't remember where from there, but was probably back to the pump inlet. My plan is to "T' it to hose 15-277 on the drawing, which vents the top port on the water pump to the top of the swirl tank in the drawing. The bottom (return) of the swirl tank goes to the inlet side of the water pump fitting (hose #15-381A). I *think* that hose 15-184 goes to the top vent on the radiator.
This is all from my rather flaky memory of what I found several months ago when I traced the numbers & arrows across several pages of the service manual.
Anyway, the ultimate goal is to get the high spots on the engine and the radiator to feed the top of the swirl tank (15-350), and the bottom of the swirl tank to return to the water pump inlet (lower ports on 15-176B). In this case, and in Len's drawing, the swirl tank/reservoir is at cooling system pressure (pressure cap is on the swirl tank) and the radiator 'overflow vent' is open to the top tank of the radiator, instead of being above a pressure cap seal. This way, the water pump will constantly pull liquid water from the bottom of the swirl tank/reservoir, and any air/steam/vapor will constantly move to the top of the swirl tank.
Remember, I'm not flying yet, so if I've mis-stated something, I hope someone who's flying will correct me.
Charlie
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