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Date: Mon, 13 Sep 2010 11:02:05 -0700
Message-ID: <AANLkTin6QiUp_grkYPjHSPuY7sbzN=Pv83Vuo9zD=TBo@mail.gmail.com>
Subject: Scheduled hose replacement
From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=001485e98b22ecd095049027e492

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>
>  *The radiator manufacturer will have a maximum number based on how stiff
> the flat sided tubes are. Too much pressure rounds those tubes and then
> pulls them loose from the fins when pressure is removed. Also the rounded
> tubes slow airflow through the radiator. *
>
> *Racing radiators tend to have higher pressure ratings than auto
> radiators. *
>
> *Most racers run 16 to 22 pound caps. Higher pressure means higher boiling
> temp for the coolant.  Also more stress on the connections. With a 2" hose
> and 22 pounds you have just about 70 pounds trying to pull the hose off of
> the fitting. With silicone hose and safety wired clamps it would not be a
> factor. That does not include Chinese replica clamps. Just real American
> made name brand clamps. You can also use real aircraft quality clamps
> already drilled for safety wire. *
>
> *Many modern cars use no pressure cap. Just a sealing filler cap on a make
> up bottle.*
> *An air space above the coolant level provides a volume of air to compress
> to control the pressure. If the moron at the gas station fills that bottle
> all the way up while reading the message on the bottle not to fill above
> this line,*
> *the end tank will blow off of the radiator just like on my wife's car. *
> **
> *The 22 pound cap is middle ground, a bit more insurance, not likely to
> hurt the radiator. *
> **
> *I use 22 pounds. Distilled water with 10% glycol and either Redline Water
> Wetter or 1/2 teaspoon full of dish washing detergent. It is gentle on the
> hands. Never a problem since 1980.*
>
> *Lynn E. Hanover*
>

Hey Lynn and the rest of you smart guys, What is your opinion on scheduled
hose replacement?  My plane has been flying for 6 years now and I just
finished the annual.  I decided that 6 years was long enough on some of my
radiator hose and decided to replace it.  In particular, I ordered up the
AN-16 steel braided hose (Earls Perform-o-flex)  for my coolant out line but
I just couldn't bear the thought of cutting and fitting that stuff and
hoping I don't get leaks or damage the AN hose fittings or cut my fingers to
shreds.  So I decided the current hoses were good for another year.  Maybe a
justification...
Opinions on scheduled replacement of SS hose?

-- 
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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<br><br>
<div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div style=3D"FONT-SIZE: 12pt; COLOR: #000000; FONT-FAMILY: Tahoma"><font f=
ace=3D"Tahoma" color=3D"#000000" size=3D"3">
<div class=3D"im">
<div>
<blockquote style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue=
 2px solid"><font style=3D"BACKGROUND-COLOR: transparent" face=3D"Arial" co=
lor=3D"#000000" size=3D"2">
<div>
<p class=3D"MsoNormal">=A0</p></div></font></blockquote></div>
<div></div></div>
<div><strong>The radiator manufacturer will have a maximum number based on =
how stiff the flat sided tubes are. Too much pressure rounds those tubes an=
d then pulls them loose from the fins when pressure is removed. Also the ro=
unded tubes slow airflow through the radiator. </strong></div>

<div>=A0</div>
<div><strong>Racing radiators tend to have higher pressure ratings than aut=
o radiators. </strong></div>
<div>=A0</div>
<div><strong>Most racers run 16 to 22 pound caps. Higher pressure means hig=
her boiling temp for the coolant.=A0 Also more stress on the connections. W=
ith a 2&quot; hose and 22 pounds you have just about 70 pounds trying to pu=
ll the hose off of the fitting. With silicone hose and safety wired clamps =
it would not be a factor. That does not include Chinese replica clamps. Jus=
t real American made name brand clamps. You can also use real aircraft qual=
ity clamps already drilled for safety wire. </strong></div>

<div>=A0</div>
<div><strong>Many modern cars use no pressure cap. Just a sealing filler ca=
p on a make up bottle.</strong></div>
<div><strong>An air space above the coolant level provides a volume of air =
to compress to=A0control the pressure. If the moron at the gas station fill=
s that bottle all the way up while reading the message on the bottle not to=
 fill above this line,</strong></div>

<div><strong>the end=A0tank will blow off of the radiator just like on my w=
ife&#39;s car. </strong>=A0</div>
<div><strong></strong>=A0</div>
<div><strong>The 22 pound cap is middle ground, a bit more insurance, not l=
ikely to hurt the radiator. </strong></div>
<div><strong></strong>=A0</div>
<div><strong>I use 22 pounds. Distilled water with 10% glycol and either Re=
dline Water Wetter or 1/2 teaspoon full of dish washing detergent.=A0It is =
gentle on the hands. Never a problem since 1980.</strong></div>
<div>=A0</div>
<div><strong>Lynn E. Hanover</strong>=A0</div></font></div></blockquote></d=
iv>
<p><br>Hey Lynn and the rest of you smart guys, What is your opinion on sch=
eduled hose replacement?=A0 My plane has been flying for 6 years now and I =
just finished the annual.=A0 I decided that 6 years was long enough on some=
 of my radiator hose and decided to replace it.=A0 In particular, I ordered=
 up the AN-16 steel braided hose (Earls Perform-o-flex)=A0=A0for my coolant=
 out line but I just couldn&#39;t bear the thought of cutting and fitting t=
hat stuff and hoping I don&#39;t get leaks or damage the AN hose fittings o=
r cut my fingers to shreds.=A0 So I decided the current hoses were good for=
 another year.=A0 Maybe a justification...</p>

<div>Opinions on scheduled replacement of SS hose?<br clear=3D"all"><br>-- =
<br>David Leonard<br><br>Turbo Rotary RV-6 N4VY<br><a href=3D"http://N4VY.R=
otaryRoster.net">http://N4VY.RotaryRoster.net</a><br><a href=3D"http://Rota=
ryRoster.net">http://RotaryRoster.net</a><br>
</div>

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