REFLECTOR: Breather tube

[John Dibble]

Nick,

I've never run much below 6 1/2 quarts.  What is your low level?  Mine's 
at 4 qt.

John

On 3/2/2012 2:31 PM, Jones Nick wrote:
>
> John, I'm in agreement with Lou on this. 3 qts/hr is too much oil 
> going somewhere. I had an IO360 that burned this much oil and it 
> fouled both plugs on a cylinder. If you are filling it to the max mark 
> you are probably just pumping most out the breather. I ran it between 
> 6 and 5 quarts and it would go about 5 hours before needing a quart.
>
> Best regards,
>
> Nick
>
> *From: * reflector-bounces at tvbf.org 
> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Lou Stedman
> *Sent:* Friday, March 02, 2012 3:20 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Breather tube
>
> John which engine are you running? Do you fill up to max? I have found 
> that if I full up to max on my 0360 I will blow out a qt. within the 
> first hour. However if I fill to 6 qt I am good for about four hours.
>
> *From: * John Dibble <mailto:aminetech at bluefrog.com>
>
> *Sent: * Friday, March 02, 2012 2:47 PM
>
> *To: * Velocity Aircraft Owners and Builders list 
> <mailto:reflector at tvbf.org>
>
> *Subject: * Re: REFLECTOR: Breather tube
>
> I thought about that.  However, I'm currently loosing 3 qt/hr and I'm 
> sure most of that is already going through the combustion chamber.  
> But, as Nick pointed out, I can't plumb into the intake (downstream of 
> my carb), so I wouldn't get any benefit of reduced crankcase 
> pressure.  Plumbing upstream of the carb would increase the pressure 
> because of the effect of ram air.  Anyone know how much of a pressure 
> reduction is possible by going through the exhaust?
>
> John
>
> On 3/2/2012 1:22 PM, Grover McNair wrote:
>
> The only down side of venting to the intake is that some oil is burned 
> with the intake charge. Deposits can build up in the combustion 
> chamber. This usually only happens on older engines where the rings 
> are worn and crankcase pressures are higher.
>
> Grover
>
> *From: * reflector-bounces at tvbf.org 
> <mailto:reflector-bounces at tvbf.org> 
> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *John Dibble
> *Sent:* Friday, March 02, 2012 1:19 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Breather tube
>
> I thought PCV did create a little crankcase pressure.  My 1975 BMW 
> motorcycle had that feature and they forgot to redesign the main seals 
> for the higher pressure and I had problems with leaks.  I solved the 
> problem by removing the PCV device and just venting to the air.  As 
> was mentioned, the main thing is to have adequate ventilation to avoid 
> engine oil leaks.  As your compression leak increases with age, more 
> venting will be needed.
>
> John
>
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