Agree the normal interval for changing glycol coolant is 2-3 years.
In my opinion it is best to use the least amount of glycol/anti freeze that
you can get away with. This of course depends on where you live and if you
intend to leave your car out to the elements at 25 C below ! Reducing the
amount of antifreeze improves hear transfer (specific heat) but reduces
corrosion protection. So I use about a 15 % glycol mix for basic freeze
protection when the ol' lady is parked in the garage and add an anti
corrosion additive - such as No-Rosion that has a minimum of 5 year life
before needing to be changed. Best to use RO water with a new fill.
Note too that if you use the waterless coolants your engine WILL run hotter
unless you increase the coolant flow rate (difficult for AH) due to the
reduced heat transfer capability. Typically they have a specific heat of
0.66 (water =1) that is 2x worse than a 50:50 glycol mix. This will not be
obvious as the temp gauge will not show it, as it measures the coolant temp
and not the temp of the engine metal bits that will be hotter. Main
advantage is that you never have to change coolant.
rg
-----Original Message-----
From: Oudesluys
Sent: Thursday, November 5, 2015 2:07 PM
To: healeys@autox.team.net
Subject: Re: [Healeys] Coolant change
Op 5-11-2015 om 18:51 schreef Bob Spidell:
> 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?
What about the seal that needs lubrication.
Kees Oudesluijs
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