[Healeys] Coolant change

[Roger Grace]

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 at 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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