coolant change

[simonx50]

Hi guys hope all is well...just wondered if anyone uses waterless coolant and whether its worth a try apparently the freezing point is a lot lower and boiling point a lot higher and shouldn't need changing and doesn't corode the engine.
Might help with the over heating.

[Maark]

I was thinking of asking exactly the same, Ed sold it to me

[simonx50]

Maark said:

I was thinking of asking exactly the same, Ed sold it to me

good ol ed!

[tonyvan]

I saw this product months ago, then again last nite on wheeler dealer.need to find out if it's compatable with alloy heads.

[R0162]

I have done a bit of reading, seems better than water at transfering heat so it will help keep coolant temps lower, and it cant boil so you will never get the associated bubbles or gas, hence still transfering heat better at higher temps.
It seem the only downside is having to carry and emergency bottle of it with you everywhere, as its not bound to be sold in service stations.

[Gadgeroonie]

can you mix it with water ?

I know a guy that sells this stuff - I can do a group buy if people are interested

[joust]

tonyvan said:

I saw this product months ago, then again last nite on wheeler dealer.need to find out if it's compatable with alloy heads.

They say it is.

http://www.evanscoolants.co.uk/faqs.html

J

[simonx50]

Gadgeroonie said:

can you mix it with water ?

I know a guy that sells this stuff - I can do a group buy if people are interested

Don't think it can be mixed with water apparently all the water has to be removed and flushed out before it can be added.
Mike still ok to bring car for mot?

[tonyvan]

They say 3% water only in an emergency.

[XLRONYX]

Guys, Evans coolant is proplylene glycol. It's called antifreeze in the US. Airports use it here to de-ice commercial jets in the snow belt. It mixes readily with water. In fact, propylene glycol is commonly sold here pre-mixed 50/50 with water.

Jeff

[R0162]

So its just pure antifreze then Jeff?..
I thought water had better heat transfer properties than antifreeze? it think it must have something else added to it, i must do some more reading, they definitely say to not add with water, but like you say Jeff antifreeze mixes with water just fine..lol

[Gadgeroonie]

simonx50 said:

Don't think it can be mixed with water apparently all the water has to be removed and flushed out before it can be added.
Mike still ok to bring car for mot?

no problem if you need the car mot'd

[XLRONYX]

NPG stands for non-aqueous propylene glycol. Non-aqueous just means "without water".

http://www.aircraftspruce.com/catalog/pdf/Evans%20...

Water is a better coolant because if its higher heat capacity and thermal conductivity.

Jeff (chemistry major before switching to engineering)

[XLRONYX]

Rather than scan my CRC Handbook of Chemistry and Physics, I'm going to point to an engineering web site for heat capacity and thermal conductivity data:

http://www.engineeringtoolbox.com/specific-heat-fl...

The heat capacity of water is 1 BTU per pound degree F. If you asked 1 pound of water to absorb 100 BTU of heat energy from the engine, the water temp would rise by 100 degrees F.

The heat capacity of propylene glycol is 0.60 BTU per pound degree F. If you asked 1 pound of NPG to absorb 100 BTU of heat energy from the engine, the NPG temp would rise by 167 degrees F! Do you see why Evans wants you to run a bigger pump and larger lines?

Jeff

[R0162]

so just to clarify whats the verdict then Jeff is it advertising BS and water transfers heat better?

[XLRONYX]

Let's look at thermal conductivity. A higher number means the liquid is a good conductor. A lower number means the liquid is a good insulator. I want my coolant to be a good conductor so that heat absorbed from the water passage walls in the block and heads gets quickly transferred to the bulk coolant that is not next to the wall.

Thermal conductivity (in Watt per meter degree-Kelvin)
H2O Propylene glycol
0.61 0.21

http://msdssearch.dow.com/PublishedLiteratureDOWCO...

http://www.nist.gov/data/PDFfiles/jpcrd493.pdf

NPG is about as conductive as oak.

http://www.engineeringtoolbox.com/thermal-conducti...

I run distilled water with Redline Water Wetter to provide corrosion protection.

Jeff