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Oh boy! A 'hot' (pun intended) topic right up there with oil and tires ;)
'Coolant'--to my pedantic eye--is a mixture of water and antifreeze. The
antifreeze is mostly ethylene glycol--some use propylene glycol, which is
non-toxic but slightly less efficient--with some pump lubricant* and corrosion
inhibitor. The corrosion inhibitor is a mild acid that gets 'used up' over
time:
http://www.google.com/patents/US6096236
Usually, coolant life is expressed in miles; modern formulations can go over
100K miles before recommended change-out, but since our Healeys aren't going to
be driven that much time becomes the issue (iron engines will rust just
sitting). I would say change it every 5 years or so (which might only be a few
thousand miles of driving for some owners).
I believe the 'waterless' coolants are mostly propylene glycol and are quite a
bit more expensive than ethylene glycol formulations. You'd still need to
change it out when the corrosion inhibitors get used up; IMO it's a gimmick.
Bob
* it just occurred to me that the only thing that needs lubricating in a water
pump is the bearings, but the last thing you want in the bearings is water. Am
I missing something?
----- Original Message -----
From: "Daniel White" <healeydan@wowway.com>
To: "healeys" <Healeys@autox.team.net>
Sent: Thursday, November 5, 2015 5:53:14 AM
Subject: [Healeys] Coolant change
I've searched the archives looking for any discussion regarding how often to
change the coolant in the BN7. If the answer is there...I missed it. I'm
running a 50/50 mix of antifreeze and tap water and it tests o.k. as far as
freeze protection. This mix has been in the system for a number of years. Does
coolant "go bad" with age? Any thoughts about the waterless coolant being sold
on the market?
Thanks,
Dan White
1962 BN7 Mk II
_______________________________________________
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">Oh boy! A 'hot' (pun intended) t=
opic right up there with oil and tires ;)<br></div><div aria-label=3D"Compo=
se body"><br></div><div aria-label=3D"Compose body">'Coolant'--to my pedant=
ic eye--is a mixture of water and antifreeze. The antifreeze is mostl=
y ethylene glycol--some use propylene glycol, which is non-toxic but slight=
ly less efficient--with some pump lubricant* and corrosion inhibitor. =
The corrosion inhibitor is a mild acid that gets 'used up' over time:<br><=
/div><div aria-label=3D"Compose body"><br></div><div aria-label=3D"Compose =
body"><a href=3D"http://www.google.com/patents/US6096236";>http://www.google=
.com/patents/US6096236</a></div><div aria-label=3D"Compose body"><br></div>=
<div aria-label=3D"Compose body">Usually, coolant life is expressed in mile=
s; modern formulations can go over 100K miles before recommended change-out=
, but since our Healeys aren't going to be driven that much time becomes th=
e issue (iron engines will rust just sitting). I would say change it =
every 5 years or so (which might only be a few thousand miles of driving fo=
r some owners).<br></div><div aria-label=3D"Compose body"><br></div><div ar=
ia-label=3D"Compose body">I believe the 'waterless' coolants are mostly pro=
pylene glycol and are quite a bit more expensive than ethylene glycol formu=
lations. You'd still need to change it out when the corrosion inhibit=
ors get used up; IMO it's a gimmick.<br></div><div aria-label=3D"Compose bo=
dy"><br></div><div aria-label=3D"Compose body">Bob<br></div><div aria-label=
=3D"Compose body"><br></div><div aria-label=3D"Compose body">* it just occu=
rred to me that the only thing that needs lubricating in a water pump is th=
e bearings, but the last thing you want in the bearings is water. Am =
I missing something?<br></div><div aria-label=3D"Compose body"><br></div><d=
iv><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weight:normal;f=
ont-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-seri=
f;font-size:12pt;" data-mce-style=3D"color: #000; font-weight: normal; font=
-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-se=
rif; font-size: 12pt;"><b>From: </b>"Daniel White" <healeydan@wowway.com=
><br><b>To: </b>"healeys" <Healeys@autox.team.net><br><b>Sent: </b=
>Thursday, November 5, 2015 5:53:14 AM<br><b>Subject: </b>[Healeys] Coolant=
change<br><div><br></div><div style=3D"font-family: times new roman, new y=
ork, times, serif; font-size: 12pt; color: #000000" data-mce-style=3D"font-=
family: times new roman, new york, times, serif; font-size: 12pt; color: #0=
00000;"><div>I've searched the archives looking for any discussion regardin=
g how often to change the coolant in the BN7. If the answer is there.=
..I missed it. I'm running a 50/50 mix of antifreeze and tap water an=
d it tests o.k. as far as freeze protection. This mix has been in the=
system for a number of years. Does coolant "go bad" with age? =
Any thoughts about the waterless coolant being sold on the market?<br></div=
><div>Thanks,<br></div><div>Dan White<br></div><div>1962 BN7 Mk II<br></div=
></div><br>_______________________________________________<br><br><div><br>=
</div></div><div><br></div></div></body></html>
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