REFLECTOR: vernatherm Brian Michalk

[Laurence Coen]

That is totally wrong.  The bypass set pressure is 1 atmosphere or 14.7 psi. 
The set pressure on the oil pressure is 80 psi.

Larry Coen
N136LC

P.S.: PZL provided a stiffer spring to solve a problem that they recognized 
and you claim doesn't exist.

--------------------------------------------------
From: "Dane White" <brammage at me.com>
Sent: Sunday, November 20, 2011 3:44 PM
To: <reflector at tvbf.org>
Subject: Re: REFLECTOR: vernatherm Brian Michalk

> (for those who may be wondering, this is a continuation of a discussion 
> about how to regulate oil pressure on the Franklin 6A-350 engine)
>
> **********************************************************************************************
>
> Actually, the set pressure on the oil system bypass is higher than the 
> engine oil pressure set pressure. There's no need to mess with that as 
> it's a manufacturer designed backup safety feature that should never be 
> used in normal operations.
>
> Increasing the stiffness of the oil filter/cooler bypass spring would only 
> delay the oil bypass to the engine to an even higher pressure when the 
> filter/cooler path is restricted or blocked. What advantage would that 
> offer?
>
> The oil system bypass spring opens only when there is a flow restriction 
> or complete blockage of the normal oil path to the filter/cooler. Don't as 
> me how I discovered that!
>
> Installing a stiffer spring or adding washers at the end of the (other) 
> oil pressure regulating spring are both effective in increasing the 
> engine's oil pressure set point. I've done both and both work just fine. 
> This is the forward (towards the firewall as mounted on our pusher 
> configured engines) spring.
>
> Don't mess with the aft (nearest the propeller) spring!
>
> Yes, we are truly "experimenters!"
>
> -Brammage
>
> Dane White
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