can i mix water and coolant if its the summer?

[supramacist]

Alright good to go. 50/50 it is.


Starter in. Crank pulley off. Waiting on the correct idle tensioner pulley. I thought it looked different but wasn't sure. Car is still up on the floor jack, I'll be back in the garage tonight. lol. I guess I can let the car down.

[cars4me89]

I'm not sure how accurate previous statements have been about how ethylene glycol is what raises the boiling tempurature. In fact, the radiator cap is what raises the boiling tempurature of the fluid. All that coolant/anti-freeze does is lower the freezing point and provide anti-corrosive agents to the mixture. I believe that the formula for your boiling point of the cooling system is for every 1 psi your radiator cap is rated to equals 3 degrees farenheit higher boiling point tempurature. So, since Supra radiator caps are manufacturer specified at 13 psi, that would equal a total boiling point of (straight water, 50/50, 70/30), whatever you're using to around 255 degrees farenheit.

[Kuban]

Originally Posted by cars4me89

I'm not sure how accurate previous statements have been about how ethylene glycol is what raises the boiling tempurature. In fact, the radiator cap is what raises the boiling tempurature of the fluid. All that coolant/anti-freeze does is lower the freezing point and provide anti-corrosive agents to the mixture. I believe that the formula for your boiling point of the cooling system is for every 1 psi your radiator cap is rated to equals 3 degrees farenheit higher boiling point tempurature. So, since Supra radiator caps are manufacturer specified at 13 psi, that would equal a total boiling point of (straight water, 50/50, 70/30), whatever you're using to around 255 degrees farenheit.

I dissagree. The mixture definately plays a part in the boiling point. Think about it. If he was running straight water, his boiling point would be 100 deg. celcius indefinately. No questions asked, that IS what it would be.

[cars4me89]

I'm sorry but that is a false statement.. water will boil at 100 degrees celcius, true. But why do you put the radiator cap on? the radiator cap raises the boiling tempurature. The ethlyene glycol has nothing to do with boiling point only anti-corrosion inhibitors and freezing point. This will work 100% guarenteed if you try it on your vehicle. You could replace all the coolant with straight water. bring the engine to operating tempurature and the water would not boil and 100 degrees celcius, yes it will rust your block no doubt but it would not boil until higher than 100 degrees C

[IHateHacks]

OK Mr. Technical you wanna get technical? Just putting a radiator cap on your car doesn't raise the boiling point. Do you know why? I didn't see it in any of your posts. Its because the cooling system is pressurized, not just because you have a radiator cap. A radiator cap doesn't pressurize the coolant, the water pump does. The radiator cap regulates this pressure. When you pressurize a liquid the boiling point raises.

Originally Posted by cars4me89

The ethlyene glycol has nothing to do with boiling point

Here we go again with false statements from someone with no experience in this topic.

Yes, ethlyene glycol has ALOT to do with the boiling point. It raises the boiling point of water significantly as much as 276 degrees F at about a 60/40 concentration. But too much ethlyene glycol WILL lower the boiling point. I was a little inaccurate in one of my statements. The % when too much ethlyene glycol will start to lower the boiling point is 80% and above, and running 100% ethlyene glycol WILL cause you engine to overheat. I have the graph to prove it but I'll leave that to Mr. Nickleye.

But here is an excerpt "Customers are strongly advised to consult with their engine manufacturer before exceeding the 67% ethlyene glycol concentration. Heat exchange properties are significantly different at higher concentrations. Ethlyene glycol concentrations above 67% are counterproductive and are not recommended."

[Kuban]

Originally Posted by IHateHacks

OK Mr. Technical you wanna get technical? Just putting a radiator cap on your car doesn't raise the boiling point. Do you know why? I didn't see it in any of your posts. Its because the cooling system is pressurized, not just because you have a radiator cap. A radiator cap doesn't pressurize the coolant, the water pump does. The radiator cap regulates this pressure. When you pressurize a liquid the boiling point raises.



Here we go again with false statements from someone with no experience in this topic.

Yes, ethlyene glycol has ALOT to do with the boiling point. It raises the boiling point of water significantly as much as 276 degrees F at about a 60/40 concentration. But too much ethlyene glycol WILL lower the boiling point. I was a little inaccurate in one of my statements. The % when too much ethlyene glycol will start to lower the boiling point is 80% and above, and running 100% ethlyene glycol WILL cause you engine to overheat. I have the graph to prove it but I'll leave that to Mr. Nickleye.

But here is an excerpt "Customers are strongly advised to consult with their engine manufacturer before exceeding the 67% ethlyene glycol concentration. Heat exchange properties are significantly different at higher concentrations. Ethlyene glycol concentrations above 67% are counterproductive and are not recommended."

That last part right there you talk about. Is described in detail with video and all in that link i posted back on page 1 i think.

[IHateHacks]

I just watched that video. Very informative. Boiling points and a liquid's heat transfer abilities are 2 different things. Like it said, water is the best coolant on earth.

I like how it showed what temp that SB chevy with aluminum heads ran at 7200rpm. With 50/50 it was 228F. With 50/50 and water wetter it dropped to 220F. Straight water was 220F. And straight water with water wetter was 208F.

I've heard of water wetter before and actually used it in my supra before my BHG. But I totally forgot about it and now that I saw that video I think I'm going to start using it again.

[cars4me89]

maybe mr. nickeleye could step and inform us on the actual facts of the cooling system and what affects boiling points directly.. i would hate to misinform others.. is it the radiator cap or the ethylene glycol that affects the boiling point. thanks

[mrnickleye]

My experience, and more so, my research, has indicated that they both have good effects on raising the 'boiling point'.

Each pound of cap pressure raises the boiling point 3.25-degrees X cap pressure. So, if you're running a 15-lb. cap, then you've effectively raised the boiling point of your system 48.75-degrees or up to 260.75-degrees.

http://www.innerauto.com/Automotive_..._Pressure_Cap/

http://www.ferret.com.au/articles/66/0c044c66.asp

http://autorepair.about.com/cs/cooli.../aa081101a.htm

And all you never really wanted to know:
http://www.jcna.com/library/tech/tech0011.html