any reasons why i should'nt
10-07-02, 02:21 AM
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any reasons why i should'nt
Howzit- I'm about to take a leap of faith, got my new rebuilt 12a, and planning to use Evan's waterless coolant. I like the idea of a pressureless system and from all that I've been able to read here,and elsewhere it seems to be for real, but to be honest I'm still a little hesitant cuz', I haven't heard anyone talk about it in the long term. So I'm just checking to see if there's been any new feedback- Aloha-
10-07-02, 07:18 AM
#6
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it uses a propylene glycol base with no water added. propylene glycol has an absurdly high boiling point at atmospheric pressure (something like 372degF, quick math in the head converts that to appx. 190degC) which means you can run the cooling system non-pressurized and still have phenomenal protection.
the main problem with cooling systems is when you get localized hot spots that boil the coolant away from the hot spot. you get a localized steam pocket. the coolant cannot get to the hot spot to cool it off, similar to how a drop of water dances on a hot frying pan without touching it. obviously, cooling ability diminishes greatly. the Evans NPG will not suffer from this because its boiling point is SO HIGH.
Because you use no water, you need twice as much of the Evans NPG as you do regular coolant. Also, you must either start with all new components or flush your entire cooling system, there is a procedure involving a more readily available "water mix" propylene glycol coolant.
the main problem with cooling systems is when you get localized hot spots that boil the coolant away from the hot spot. you get a localized steam pocket. the coolant cannot get to the hot spot to cool it off, similar to how a drop of water dances on a hot frying pan without touching it. obviously, cooling ability diminishes greatly. the Evans NPG will not suffer from this because its boiling point is SO HIGH.
Because you use no water, you need twice as much of the Evans NPG as you do regular coolant. Also, you must either start with all new components or flush your entire cooling system, there is a procedure involving a more readily available "water mix" propylene glycol coolant.
Last edited by peejay; 10-07-02 at 07:20 AM.
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10-07-02, 07:33 AM
#8
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You can buy a non pressurized radiator cap, or modify an existing one.
This doesn't prevent the block from getting pressurized due to water pump head pressure, but it's better than radiator pressure + head pressure!
This doesn't prevent the block from getting pressurized due to water pump head pressure, but it's better than radiator pressure + head pressure!
10-07-02, 04:39 PM
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It's a bit more involved than that, I would check out Evans' web site and Rob at his PineappleRacing.com site, their loaded with info- also check the guys in2nd& 3rd. gen for tidbits on install clues-
10-07-02, 05:03 PM
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Originally posted by MIKE-P-28
Man now that sounds pretty cool..
I will have to check on this
although sounds like peejay has done his homework on this
Man now that sounds pretty cool..
I will have to check on this
although sounds like peejay has done his homework on this
10-07-02, 07:45 PM
#15
Originally posted by peejay
... you get a localized steam pocket. the coolant cannot get to the hot spot to cool it off, similar to how a drop of water dances on a hot frying pan without touching it.
... you get a localized steam pocket. the coolant cannot get to the hot spot to cool it off, similar to how a drop of water dances on a hot frying pan without touching it.
10-08-02, 12:20 AM
#16
Got Boost?
I don't understand it....
propylene glycol
1) has a much lower specific heat,(.60 cal/g*K vs 1.00cal/g*K) so it takes forty percent less time to heat up
2)doesn't conduct heat nearly as well as water,(.21W/g*C vs .43 W/g*C)so it cools twice as slow requiring a larger radiator, to be as effective.
3)at 104 degrees C becomes flammable. yikes!!
So yes it gives you higher temperature protection, but at what expence.
I don't understand it, thats not to say it does't work, but just shows that I haven't heard enough about it, or seen any proof that it would have any sort of longevity.
If it weren't for the low boiling point/ low freezing point of water, there would be no reason to use anything else. It conducts heat very well, and as a specific heat more than almost any material out there.
propylene glycol
1) has a much lower specific heat,(.60 cal/g*K vs 1.00cal/g*K) so it takes forty percent less time to heat up
2)doesn't conduct heat nearly as well as water,(.21W/g*C vs .43 W/g*C)so it cools twice as slow requiring a larger radiator, to be as effective.
3)at 104 degrees C becomes flammable. yikes!!
So yes it gives you higher temperature protection, but at what expence.
I don't understand it, thats not to say it does't work, but just shows that I haven't heard enough about it, or seen any proof that it would have any sort of longevity.
If it weren't for the low boiling point/ low freezing point of water, there would be no reason to use anything else. It conducts heat very well, and as a specific heat more than almost any material out there.
10-08-02, 03:29 AM
#18
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Originally posted by diabolical1
that makes sense, but isn't this what Redline Water Wetter supposedly prevents with water/antifreeze mixes? supposed to decrease the water's surface tension and also raise its specific heat or something to that effect?
that makes sense, but isn't this what Redline Water Wetter supposedly prevents with water/antifreeze mixes? supposed to decrease the water's surface tension and also raise its specific heat or something to that effect?
Then fatboy7 sez:
I don't understand it....
propylene glycol
1) has a much lower specific heat,(.60 cal/g*K vs 1.00cal/g*K) so it takes forty percent less time to heat up
2)doesn't conduct heat nearly as well as water,(.21W/g*C vs .43 W/g*C)so it cools twice as slow requiring a larger radiator, to be as effective.
3)at 104 degrees C becomes flammable. yikes!!
So yes it gives you higher temperature protection, but at what expence.
I don't understand it....
propylene glycol
1) has a much lower specific heat,(.60 cal/g*K vs 1.00cal/g*K) so it takes forty percent less time to heat up
2)doesn't conduct heat nearly as well as water,(.21W/g*C vs .43 W/g*C)so it cools twice as slow requiring a larger radiator, to be as effective.
3)at 104 degrees C becomes flammable. yikes!!
So yes it gives you higher temperature protection, but at what expence.
Besides, the popylene glycol, while aborbing less heat per gram, is a heavier luquid than water, so the situation is not as bad as you make it out to be when you consider that cooling systems move a volume of water, not a weight.
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