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Old 7th February 2008, 18:47   #1
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Default engine coolant-does concentration levels affect operating temparature.

To put it short and precise:
Does various concentrations ( coolant liquid: distilled water) of coolant affect the normal operating temparature of engine?
eg: a) you buy a 1ltr coolant concentrate and use 2 ltr distilled water to obtain 3ltr of engine coolant.(1:2 ratio).
b) you use 2 ltr of coolant concentrate and use 1 liter of distilled water(2:1 ratio).
In above case will there be any difference in engine temperatures assuming normal street usage?

Now for the explanation and discussion part:

The reasons why I asked this and what I do in this regard:

I got the coolant changed with a different brand and earlier there used to someother brand workshop guy filled in(this time i bought it from a trusted shop outside and handed over it). Previously my engine temp needle used to stand exactly at 1/4th of the temp guage under normal operations(city+highway runs).Now, with new coolant it stays a little above quarter mark but much lower than half mark, but it really stays there only.
According to my knowledge- the thermostat regulates the coolant flow such that engine temparatures are always at optimal level (again under normal usage-not hill climbing).It maintains such a temparature where engine performs its best. So, any thing above that will be absorbed by allowing flow of coolant.
Hence, varying concentration /brands should not affect much-given that heat absorbtion rate of mixture may vary but the final temparatures would remain the same na?
Also some related questions to discuss:
1.) given that water is the best absorbant of heat and antifreeze mixture is just to lower freezing point and delay boiling point- it is better to keep water proportions higher than antifreeze- hence i think a 1:2 ratio is better than 2:1 ratio? Also, no matter how much quality (premium) coolant liquid you use- the final engine operation temparature should be the same na?(after a cold start atleast) becuase if the coolant is of great quality all that it can do is to absorb heat and then cool quickly but still the thermostat maintains optimum temparture only- it is not like you get a 'coool' engine by using a superb coolant, right?
2.) what chemicals are used in the coolants we purchase in market? Ofcourse am refering to those concentrated solutions and not pre-mixed ones available in petrol bunks. Also, why is coolant always in green colour only?? is it just because of some colur coding or the chemical composition it self?

Earlier I used to wonder whether the temparature needle could be brought to coolest side by using special coolants so that car will run 'cooool' now i know a steady optimum temperature is what an engine needs to peform.
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Old 7th February 2008, 18:55   #2
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You ended up answering your own question...congratulations!! on self diagnosis...
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Old 7th February 2008, 18:59   #3
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I'll be honest here. I follow coolant concentration guidelines only when flushing the radiator. Rest of the times, I top up with coolant / water just by an informal "colour" check.

Quote:
In above case will there be any difference in engine temperatures assuming normal street usage?
Nope, there will not be any difference. The thermostat will maintain the engines ideal operating temperature.
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Old 7th February 2008, 19:02   #4
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Quote:
Originally Posted by nitroxx View Post
You ended up answering your own question...congratulations!! on self diagnosis...
hey jokes apart why don't you share your experience,besides my last question of what the commercial coolants are composed of is atleast unaswered. you can give it a try i think
EDIT:
Quote:
I top up with coolant / water just by an informal "colour" check.
i personally believe keeping water ratio more the coolant liquid ratio will help in better heat absorbtion and hence lesser over heating than using concentrated mixtures of coolant liquid and water. Ofcourse, most people avoid this headache by purchasing pre-mixed coolants like that we get in petrol outlets.

Last edited by deetee : 7th February 2008 at 19:09.
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Old 7th February 2008, 19:57   #5
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Quote:
Originally Posted by nitroxx View Post
You ended up answering your own question...congratulations!! on self diagnosis...


deetee, I tried to read your post but its a pain. Do try to make your posts more legible.

And about color
http://www.tegger.com/hondafaq/overh...e_Mag_53_g.pdf

True Colors

"the original glycol-based “green” antifreeze we are all familiar with. They have quick-acting silicate and phosphate corrosion inhibitors that do a good job inhibiting corrosion on both iron and aluminum surfaces. This familiar green liquid has proven its worth in all the temperature extremes of North America. Virtually any vehicle can use this fluid."

Last edited by jkdas : 7th February 2008 at 19:59.
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Old 7th February 2008, 21:02   #6
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Did u also get your carburator tuned while u did the coolant thingy?because adjustin the air fuel mixture i ve seen has some effect on the running temperature of the engine.
For example when it used to be too rich my engine temperature needle used to show a little less than what it used to show when the air/fuel mixture was perfectly tuned.
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