REFLECTOR: Update on my Subaru installation

[Al Gietzen]

Well; Sid, I'll have to disagree with your disagreement.  The pressure
exerted on the spring is the differential pressure on the seal plate, which
is dependant on the ambient pressure outside.

 

I use a double cap setup; 15 on the filler neck; 23 on the expansion tank.  

 

Alex; before you get too serious about the non-aqueous coolant, take a look
at the viscosity (pump power, pressure drops) and the specific heat
(requiring greater flow rates for the same heat removal).  To me it all adds
up to a poor choice; and the two people I know who have tried it gave it up
as a bad idea.

 

Best coolant is water, with just enough EG (or other) for corrosion
protection.

 

Al

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Sid Knox
Sent: Saturday, March 28, 2009 3:38 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Update on my Subaru installation

 

I have to disagree here... the seal is working against a spring, not ambient


pressure.  Therefore, altitude is not a factor, or at most, a minor factor.

 

Sid

 

 

----- Original Message ----- 

From: "Laurence Coen" <lwcoen at hotmail.com>

To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>

Sent: Saturday, March 28, 2009 1:23 PM

Subject: Re: REFLECTOR: Update on my Subaru installation

 

 

I really should read these things before I hit send.  I should have said a 9


psi cap at sea level or 24 psi absolute pressure.   That 14 psi cap would 

give about 29 psi absolute at sea level.  A 20 psi cap should handle things 

to 12,000 plus feet.

 

Larry Coen

N136LC

 

 

From: Laurence Coen

Sent: Saturday, March 28, 2009 1:37 PM

To: Velocity Aircraft Owners and Builders list

Subject: Re: REFLECTOR: Update on my Subaru installation

 

 

Alex,

 

At 10,000 feet you lose about 5 psi of atmosphere making your 14 psi cap a 9


psi cap absolute pressure.

 

Larry Coen

N136LC

 

 

 

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