Message-ID: <068101c42431$b8c174a0$6401a8c0@Davidscmptr>
Reply-To: "David Carter" <dcarter@datarecall.net>
From: "David Carter" <dcarter@datarecall.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3174406@logan.com>
Subject: Re: [FlyRotary] Re: Dave's pump problems and Rotor Poll
Date: Fri, 16 Apr 2004 23:09:03 -0500
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Speaking of the "vent from high point in the engine and/or pump":  That
"vent line" may be asusmed to initially have air at the vent fitting, which
"should" flow to some tank; with the space the air occupied being replaced
by liquid coolant.  Thereafter, won't there be continuous coolant flow
from/through that vent line back to whatever named tank it is plumbed to?
If that tank is pressurized and is part of the total pressurized system, and
if the bottom of that tank "drains down"/flows down (as air is expelled at
start) to the radiator outlet/pump inlet side of the system, then there will
be "lowest pressure" in that tank, so that the vent line, being after the
pump and at higher pressure, will always flow coolant back to the tank and
probablay continuously down thru the bottom hose and into the low pressure
area into the pump, etc, etc.

If the vent line just goes to some "tank" that is not plumbed, eventually,
to the low pressure (pump inlet) area, then, as others have said, it isn't
the kind of vent that will do the job we need done.

David

----- Original Message ----- 
From: "Ken Welter" <rotary.coot@verizon.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, April 16, 2004 12:09 PM
Subject: [FlyRotary] Re: Dave's pump problems and Rotor Poll


>   I have had to deal many systems with high points like you have
> mentioned and I have tried to bleed them out but they always develop
> an air pocket in that high point and the only way to stop it is to
> make that high point your pressure relief point.
>   To do this I have  made a remote pressure relief cap assembly and
> tapped off that high point, note that the cap you now have on the
> fill point must be replaced with a with a non vent cap to seal it and
> force the venting to take place at the high point.
>   In the case that there are two high points I bring a line from each
> point to the remote pressure cap.
>
>   Ken
>
>
>
> >
> >
> >Thanks for the input.  I made that drawing for (un)clarity.  But in
> >reality my system is just as you have indicated.  there is a straight
> >uphill path from the upper part of the rad to the pump housing.  I have
> >an air outlet screw on the high point of the water pump to bleed out the
> >last little bits of air.
> >
> >Thanks,
> >Dave Leonard
> >
> >
> >>>   Homepage:  http://www.flyrotary.com/
> >>>   Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>