From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Sump Breather?
Date: Mon, 2 Nov 2020 21:56:28 +0800
References: <list-893973@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-893973@logan.com>
Message-Id: <6ABADABB-9C95-4E6F-A4D4-8A7EA3D52AB3@gmail.com>

Hi Bobby.

So now I=E2=80=99m confused!
Where did your 1=E2=80=9D vent go?

Steve
> On 2 Nov 2020, at 9:51 pm, Bobby Hughes BHughes@qnsinc.net =
<flyrotary@lancaironline.net> wrote:
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> My super charged renesis had a 1=E2=80=9D vent. It was too small. Just =
enough vapor to make a mess. The tube was connected at the oil filler =
neck so the location may not have been the best choice. I=E2=80=99m =
planning a 1=E2=80=9D vent for the normally aspirated S21 build.
> =20
> Bobby
> =20
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20=

> Sent: Sunday, November 01, 2020 8:28 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Sump Breather?
> =20
> Thanks Lynn and Jeff.
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> Appreciated. My vent is probably only 3/16 inch and It just had me =
thinking!
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> Cheers
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> Steve
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> > On 1 Nov 2020, at 9:01 pm, lehanover lehanover@aol.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > Crank case pressure is a function of the volume of combustion gasses =
escaping past the side seals and through the end gaps at the side seal =
ends and corner seal fitments.=20
> >=20
> > There will always be some flow even on a new engine. So the trick is =
to keep the outbound flow speed low so as to keep escaping oil droplets =
falling back into the engine rather than being expelled. In racing we =
are required to have a catch bottle with a minimum volume of 1 quart. A =
well done rotary has a remarkable low flow rate and can get along fine =
with a small diameter vent tube. Not a big problem on the street.=20
> > In the aircraft the flow will be higher as the engine is usually run =
at or near full throttle for long periods.=20
> > So run it hard and look into a catch bottle to see how much oil is =
being lost. A few drops to nothing is ideal.=20
> > Most can be vented into the intake flow but that will not show up =
any problems. Every landing needs a oil level check. If the breathing is =
restricted, pressure may push out a seal or turn a seal lip over =
backwards. Followed by much oil loss. I shorten the seal springs and =
build seal retainers on each engine. You can also buy double
> > lip seals with one lip facing in and out. Keeps dust out of the seal =
lips.=20
> >=20
> > This is seldom a problem and did not occur on showroom stock Mazda =
rotaries that were turned up to high RPM. So probably not a factor.
> > Lynn E. Hanover=20
> >=20
> > In a message dated 11/1/2020 4:57:53 AM Atlantic Standard Time, =
flyrotary@lancaironline.net writes:
> >=20
> > Hi Lynn EH and all
> >=20
> > What size breather from the sump is required?
> > Is this the same for all the various models (particularly the =
Renesis)?
> > We have the OEM sump but removed the plastic manifold and put a =
filler cap with small breather on the top of the steel vertical tube =
that runs down into the pan.
> > What would happen if this breather was too small?
> >=20
> > Thanks
> >=20
> > Steve Izett
> > Perth Western Australia.
> >=20
> >=20
> >=20
> >=20
> >=20
> > --
> > Homepage: http://www.flyrotary.com/
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> --
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