REFLECTOR: Crankcase venting

[Scott Derrick]

John,

I'm taking the Andair out of the breather line today/tomorrow.

I fairly certain the hose is 5/8, but there is a joint in the line where 
it steps down to 1/2" for about 3 inches.

I will replace with 3/4 also and see if that helps.  The Lyc's don't 
tend to have as much blow by as the Cont's, so if 5/8 is min for a 540, 
its certainly to small for a 520!

thanks,

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Crankcase venting
From: John Tvedte <johnt at comp-sol.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 04/27/2011 09:15 AM

> Scott,
>
> Have you tried without the Andair?  What is the size of the crankcase breather outlet on your IO-520?  Bart @ Aerosport said (for my IO-540K) that 5/8" was the min. (fine for a healthy engine) - and that 3/4" would be fine in general.
>
> John
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Scott Derrick
>
> I'm experiencing oil seeps that I think I the result of excessive crankcase pressure.
>
> Continentals are notorious for blowby, even when new and require a very open vent. I installed a Andair air/oil separator which does work really well in captureing the oil but I fear it is causing the excessive back pressure.  Anybody else have experience in this regard?
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