REFLECTOR: Breather tube

[John Dibble]

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] *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
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20120302/2f9bf92c/attachment.htm>