REFLECTOR: Breather tube

[John Dibble]

Lou,

I have a Franklin.  I know that's true for Lycomings and Continentals, 
but it doesn't seem to matter with the Franklin.

John

On 3/2/2012 2:19 PM, Lou Stedman wrote:
> 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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