REFLECTOR: Breather tube

[Jones Nick]

I would add a quart at the 5 quart level which usually happened at about 5 hours. If you are not running the engine at 75% you can probably let it get to 4 quarts but I would never go below that. That is to say I would not take off with only 4 quarts, you would be running your engine at 100% for takeoff with only 4 quarts.

Best regards,

Nick and Connie Jones
Velocity XL-RG
N10CN
99% done 90% to go

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of John Dibble
Sent: Friday, March 02, 2012 4:04 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Breather tube

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> [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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