Jeff,
On my radiator, I have a solid cap, no
pressure relief. This cap seals at the top of the radiator neck, not down
at the bottom where the pressure cap seals. That allows the coolant to rise
into the overflow neck. The overflow neck nipple is then plumbed to the
bottom of my swirl can and the swirl can has a pressure relief cap on it.
I think 21 lbs on the pressure relief cap.
This system automatically eliminates air and
I periodically check the swirl can to see if I need to add coolant. I only
have to add coolant if I have had the system apart for maintenance and
introduce air.
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Jeff Whaley
Sent: Tuesday, October 08, 2013
9:35 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Multiple
coollant pressure Caps
My
original radiator was custom-built and had no filler neck. I bought a new
stock radiator that comes with a filler neck and pressure cap. I already
have an expansion tank high on the firewall with a filler neck and pressure
cap. The radiator will be mounted under the engine. In this
scenario is it acceptable to have 2 pressure caps? I don’t really
want the second cap and am considering getting it welded shut - but do I have
to? If the lower-mounted pressure cap has the highest pressure rating
I’m thinking it should be okay. Has anyone tried this?
Jeff
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