i know that coolant threads have been talked about alot, but everyone it seems refers to evans as a no pressure system. i put it in my truck about a year ago, but called them first to ask exactly how to do it. when i asked about drilling a hole in the cap, like it says on the diesel site instructions, the guy said don't do that. use your system the way it is. just because the coolant has a higher boiling temp, doesn't mean you shouldn't have pressure on your system. i guess for like water pump seals?any way i got a 5.00 cap from napa and drilled it out and ran it for a short while to get the condensation that would accumulate at the top of the degas bottle out and put the stock cap back on. about a half gallon of water evaporated even though i drained the block. i just never heard anyone putting the undrilled cap back and running normal pressure. who knows if this right.

 

Your thermostat is going to control the temperature at which your engine operates, so the fact that the Evans has a higher boiling point will not translate into higher system pressure unless your thermostat sticks. I would, therefore, think that you will have no problems either way.

 

thanks for the reply, i guess my question wasn't to clear. what i am wondering is, why everytime this coolant is mentioned, it seems it is always part of a 0 pressure system.its just a waterless option with the benefits they claim. in fact the person i spoke to at evans told me that the part about o pressure needs to be removed from diesel sites web page. i also put on bob's coolant filter, and have to say that my engines coolant is as clear as the the coolant you pour from the jug. i read on hear for over a year before joining because you guys seem to get to the bottom of myths & misinformation. so i was just wondering about this.

 

Okay. I hear you. I can't asnwer for sure as to why Dieselsite came up with the procedure they use, or how it was derived. Once you've drilled the hole, I can only assume that it was decided to leave it that way for any number of unknown reasons. The reasons I can suppose which may have been used to justify the procedure are:
1) an assumption that the Evans will not evaporate because it is below it's boiling point, or
2) a non-pressurized system is safer system

However, for Reason Number 1, I know for a fact that this is not a good assumption because we all know that water will evaporate even below its boiling point. Therefore, even the Evans will eventually evaporate, but at only about 7% the rate of water due to its lower vapor pressure.

And as for Reason Number 2, the only increase in safety of a non-pressurized system is that it will not spray you with hot coolant, so it is safer in that sense. However, everything I've read on the Evans site indicates that the system will run hotter than a conventional water:EG mixture, even though I am not sure how that will actually take place unless you either change to a hotter thermostat or install some additional resistance in the existing temperature sensor to fool the system into letting it get hotter... but THEN you have decreased the factor of human safety. Hmmmm.

 

well pete, i went to the evans site and read what they claim. there actually is apart that says low press. it all sounds great, they back it up with independant certified testing. who knows, i don't know half of what i'm reading. they have millions of miles using it in OTR trucks, i guess the same principals apply. what to do, what to do? you try and do the best maintenance you can, and use the best new technology has to offer,but you never know. its frustrating.

 

Frustrating it is. I hope I didn't sound like I was poo-pooing on the Evans... I didn't mean to. I was just commenting on what might be some of the reasoning behind leaving it as a zero pressure system. Personally, I really like to concept of the Evans coolant, but have been very reticent about investing until I redo the oil cooler lines in the radiator, replace the heater hoses, and replace the heater core. I've already done the radiator hoses, stat, and water pump. If I can get all that done this year or next, I might just invest in the Evans because I'll have a nearly new system end-to-end with minimal liklihood of leaks.

I think you're OK to follow the lead from Evans on this, especially given their OTR experience.

 

hey pete, thanks for the reply, i didn't take it that way, its just mind numbing wading through all the info. and of coarse companys are going to try and sell you there stuff. its nice to get info from real world experience.

 

There is more information than any of us can totally absorb, but is is fun to learn, isn't it?

 

I had my '02 7.3 cooling system converted to Evans NPG+ five years ago. Was pricey due to the incompetent installation- failure to follow the instructions on the conversion- by a Ford dealer in northern Virginia. The key, according to Evans, is getting ALL the water out of the engine and radiator. Evans says up to 2% or 3% by Brix analysis is alright but anything over that reduces the effectiveness of the coolant and degrades its anti-corrosion properties.

Having had the system drained and filled properly in Louisiana I have been very happy with the coolant's performance and am glad to have one less maintenance issue to deal with.

 

I have yet to run into anyone running Evans in OTR operations...everybody I have talked to is running ELC like Delo. I'm not knocking Evans, I just speak to lots of OTR guys at truck stops and shop mechanics.

Wondering out loud here...I wonder the effect on new trucks (class 8) where computers are monitoring everything and making numerous adjustments based on sensor readings?

 

I guess I should have said "their claimed OT experience" since I honestly don;t have any direct knowledge along those lines myself.

Regarding the newer computer controlled engines, I honestly expect no difference with the Evans. The only thing being controlled is temperature, and the thermostat you use is going to keep that rather steady regardless of what the coolant chemistry is.

... or am I missing something else here?

 

Evans claim is that their waterless coolant removes more heat from the surfaces it contacts resulting in higher coolant temperature/lower coolie(metal) temperature, it is also claimed to shed more heat with navagating the radiator.

I ran the evans for 4 or 5 years(0 pressure) but got tired of ordering and waiting for delivery...first a water pump, then an oil cooler then a thermostat leak...it got old. So I switched to CAT elc, available local. I don't remember how much I payed for the CAT elc but it is relatively cheap.

nothing at all against evans, if it was available locally I would probibly still run it...on the other hand CAT ELC seams to be just as sufficient for our trucks at a fraction of the cost