REFLECTOR: TE crankcase vent.

[Don Johnston]

What is this "augmenter" that you refer to?

My A&P doesn't like air/oil separators because he says that take oil with
high amounts of acid and dump it back into the engine.

And I gave up on the auto-aircraft engine comparison. Auto engines (that go
+100,000 miles) rarely are run at 100% power and typically cruise at 25%.
Aircraft engines are running at 100% at every takeoff and typically cruise
at 75%. A better comparison would be to NASCAR engines... that probably get
overhauled after every race. :-)

-Don

On Sun, Mar 10, 2013 at 11:06 AM, Scott Derrick <scott at tnstaafl.net> wrote:

>  Augmenting the crankcase breather could be a considered a negative if you
> ignore the fact that your engine runs so much cleaner.  Not to mention the
> lower cowl.
>
> Automotive engines have augmented the crankcase breather system for
> years.   think about how long an auto engine lives vs an aircraft engine.
> Maybe, possibly this is one of the reasons that contribute to this?
>
>  The racing crowd up the ante and aggressively augment the breather
> system.  Both to the keep things cleaner but too increase HP.
>
> The only negative to augmenting the breather is a possible increase of
> oil(vapor) being thrown overboard through the breather.  Of course because
> your crankcase pressure is reduced due to the augmentation less crankcase
> vapor(oil) is being sucked/blown into the cylinder during the intake
> cycle.  Yes, aircraft engines through design, are heavy breathers, so
> breather augmenting may increase oil consumption more than it would on auto
> engiens which have considerably less blow by.
>
> Since I put the augmenter on my engine I did notice a slight increase in
> oil consumption, which I attributed to an increase in oil saturated vapors
> going out the breather.  Maybe an addition 1/2 quart over 50 hours of
> flying.  Realize also that these same vapors are saturated with acids,
> unburned fuel, lead, etc.  In short Bad Shit!  Not a bad trade off, to rid
> all that shit from my crankcase at a cost of about 0.05$ an hour.  I think
> my oil has stayed  noticeably cleaner  after the augmenter was added.
>
> YMMV
>
> Scott
>
>
> -------- Original Message --------
> Subject: Re: REFLECTOR: TE crankcase vent.
> From: Don Johnston <numa at comcast.net> <numa at comcast.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org><reflector at tvbf.org>
> Date: 03/10/2013 07:56 AM
>
> I wouldn't think it would get that hot. I imagine there's a hose between
> the engine and  the exit tube. And by the time it gets that far, the air
> (gas/vapor) would have cooled.
>
> I would think the vacuum created is a more significant issue. IIRC, I
> recall a Lycoming paper where they said the breather tube should exit in a
> high pressure area to prevent oil from being drawn out.
>
> -Don
>
> On Sat, Mar 9, 2013 at 10:46 PM, Mark Magee <edjonesbrady at gmail.com>wrote:
>
>> Rene,
>> Is the tubing directly glassed in? If so any de-lam issues from heat. OTW
>> what did you use between the tubing and the glass/foam/laminates.
>>
>> Mark B. Magee
>> Sent from IPhone 4S
>>
>> On Mar 9, 2013, at 9:38 PM, David Rene Dugas <renedugas at gmail.com> wrote:
>>
>> > Rene'
>> >
>> > <photo.JPG>
>> >
>> >
>> >
>> > Rene' Dugas
>> > Sent from an Apple.
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>
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