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sidsel.svein(at)oslo.onli
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 Posted: Fri Dec 16, 2011 8:50 am Post subject: SV: Oil tank breather catch bottle |
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Graeme,
Late greeting: Congratulations with your first flight! Hope to see the
beautiful airplane - and you - at Popham next June.
Oil tank breather catch bottle - see attached photo: I stopped by a ladys
hair dresser saloon and got a small, empty bottle. Don't know what had been
in it, but probably some expensive hair treatment liquid (there is a reason
why homebuilts in our country are classed "Experimental"!). Made a holder
out of s/s plate, bolted to the firewall. Rubber hose simply put down the
opening. Never a drop collected, though!
(Note re. the photo: Taken during the winter before I installed an oil
thermostat. The oil cooler is covered by aluminum plates, as is abt half of
the coolant cooler. With the thermostat, I don't need to do any blocking of
the oil cooler, while occasional blocking of part of the coolant cooler is
done remotely (and stepless) during flight from inside the cockpit by means
of a Vans cooler shutter (very nice piece of equipment, ordered from Vans in
the U.S.). Part of the coolant cooler is always open to the air flow, as
the warm air collector for cockpit heating is placed right behind that
section of the cooler.)
Regards
Svein
LN-SKJ
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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Sat Dec 17, 2011 5:36 am Post subject: Re: SV: Oil tank breather catch bottle |
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Hi Svein,
I agree that it is nice to install a device to prevent any oil vapor condensation from the breather to stain the bottom of your fuselage. However, in my opinion, the installation shown on your picture looks unsafe as there is very little section for the vapor to escape. The result can be a too high pressure build up in the oil tank and also in the crankcase with possible bad consequences:
- what makes the oil returning from the crankcase to the tank is the blow-by which creates a pressure build-up inside the crankcase, pushing the oil out to the tank. If the oil tank is not appropriately vented to the atmosphere or if the vent is restricted significantly, then the differential pressure between the crankcase and the tank will be reduced, possibly leading to a reduced flow of oil back to the tank. In the worst case, you may end up with a full crankcase, an empty tank... and then a dead engine!
- the increased pressure in the tank and the crankshaft may also cause the seals to blow out, leading to loosing all your oil in flight.
I would suggest you increase the diameter of the venting hole of you bottle to about 8 mm which is the diameter of the venting hose recommanded by Rotax.
Regards
Remi Guerner
F-PGKL
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Trevpond(at)aol.com
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| Posted: Sat Dec 17, 2011 6:46 am Post subject: SV: Oil tank breather catch bottle |
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Hi Svein,
Neville has a way of doing this, give him an email at: neveyre(at)btinternet.com (neveyre(at)btinternet.com) and he will be delighted to let you have the information.
regards
Trev
G-LINN
In a message dated 17/12/2011 13:39:49 GMT Standard Time, air.guerner(at)orange.fr writes:
| Quote: | --> Europa-List message posted by: "Remi Guerner" <air.guerner(at)orange.fr>
Hi Svein,
I agree that it is nice to install a device to prevent any oil vapor condensation from the breather to stain the bottom of your fuselage. However, in my opinion, the installation shown on your picture looks unsafe as there is very little section for the vapor to escape. The result can be a too high pressure build up in the oil tank and also in the crankcase with possible bad consequences:
- what makes the oil returning from the crankcase to the tank is the blow-by which creates a pressure build-up inside the crankcase, pushing the oil out to the tank. If the oil tank is not appropriately vented to the atmosphere or if the vent is restricted significantly, then the differential pressure between the crankcase and the tank will be reduced, possibly leading to a reduced flow of oil back to the tank. In the worst case, you may end up with a full crankcase, an empty tank... and then a dead engine!
- the increased pressure in the tank and the crankshaft may also cause the seals to blow out, leading to loosing all your oil in flight.
I would suggest you increase the diameter of the venting hole of you bottle to about 8 mm which is the diameter of the venting hose recommanded by Rotax.
Regards
Remi Guerner
F-PGKL
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