This is interesting.....
Anyone on the forum running this product, or have any past experience with it?
Evans Heavy Duty Diesel Thermal Coolant(HDTC) : Amazon.com : Automotive (http://www.amazon.com/Evans-Diesel-Thermal-Coolant-HDTC/dp/B003C1HMH8/ref=pd_sbs_auto_4)
It seems to be held in high regard by a number of people using it in a Diesel Engine.
"Evans Heavy Duty Thermal Coolant EVANS-HDTC Evans HDTC waterless coolant boils at 375° F. In use, it features a huge separation between the operating temperature of the coolant and its boiling point. HDTC can therefore control metal temperatures at coolant temperatures that are well above the boiling point of water. With engine metals protected at higher coolant temperatures, fan turn-on temperatures can be safely increased. Evans has found that raising the fan temperature to about 230° F decreases fan-on time over 50 percent. Engine and truck builders often use giant radiators and amazingly powerful radiator fans for the sole purpose of keeping water-based coolants cold enough to remain functional. Released from the burden of avoiding the boiling point of water, HDTC waterless coolant enables the safe use of higher coolant temperatures and sharply reduced fan usage. Thousands of dollars in fuel savings annually result from that technique. * Boils 375F @0psi * Freezes -40F * Viscosity 2.3cp @ 212F * Surface Tension 44dyn/cm"
Evans - Heavy Duty Thermal Coolant (HDTC) - Coolants by Evans Cooling Systems, (http://www.environmental-expert.com/products/evans-heavy-duty-thermal-coolant-hdtc-183087)
http://www.truckinginfo.com/channel/products/article/story/2010/02/evans-coolings-heavy-duty-thermal-coolant-available-in-gallon-containers.aspx?prestitial=1 (http://www.truckinginfo.com/channel/products/article/story/2010/02/evans-coolings-heavy-duty-thermal-coolant-available-in-gallon-containers.aspx?prestitial=1)
And this presentation :
http://www.foresteruniversity.net/slides/Beyond-Boiling-Point-with-Waterless-Coolants.pdf (http://www.foresteruniversity.net/slides/Beyond-Boiling-Point-with-Waterless-Coolants.pdf)
Interesting.....I have never heard of this product. What's involved in conversion of this product?
It seems to me that maintaining the proper operating temperature of the engine is the critical issue with any coolant. So how does the Evans coolant rate in heat transfer as compared to other coolants? Raising the boiling point may be ok, but not if it leads folks to operating engines at excessive temperatures.
Steve,
If you read through the links, I think it mentions a pre-flush with a product they have to try and remove as much water as possible from the system -- before filling with the Evan's.
Bob,
The testimonials I read at different places online included some who did raise the baseline operating temperature to achieve better fuel economy, but also there were some that left things as they were, realizing the benefit of the coolant's higher threshold of a boiling point to achieve a significant buffer in situations of heavy-pulling and/or climbing grades where one gets nervous about the temperature climbing. I would also think this product might assist efficiency in the tube & shell Allison transmission cooler-- in extreme conditions.
It is about twice the price of a gallon of good quality anti-freeze -- but is considered a lifetime product never to be changed out.
Evans has been around awhile and enjoyed some popularity with the racing crowd several years ago.
Lots of requirements for diesel coolant besides boiling point - cavitation resistance, liner pitting, erosion, corrosion, gasket degradation, etc. I would stick with one of the OAT extended life coolants endorsed by Cummins or Cat. Too much to lose...
I just love testimonials that include better fuel mileage with such a product, wonder if that is due to less hp required to pump it thru the engine ? or maybe you can remove the water pump all together ?
I am old school here, yes there are advantages of running a higher engine temps, howsomeever, there are major changes required as Waukesha engine developed years ago, called steam cooled, yes they ran hotter, but not a trouble free system.
Keeping my ISM500 just like Cummins designed it, fits my opinion. Expermenting with MY engine, no, but you are welcome to give it a try, then give us your testimonial :o
Crazy never ends. YMMV
Dave M
Exactly what I'm thinking. I read the presentation and a slide chart on thermal conductivity in the middle tells it all:
Standard 50/50 mix of regular coolant is about .4 W/m K
Evans Coolant is about .22 W/m K
(pure water in contrast is .6 W/m K)
So, using Evans WILL increase operating temperature on hot, steep grades.
The presentation goes on about tests showing increasing fuel efficiency (around 4%) - due to less fan ON time by setting the ON temperature for the fan to 230 F.
There is no mention of studies on what the impact of the engine longevity or service intervals is. It's well known oil viscosity changes dramatically with increased temperature.
The question becomes can the rest of the engine handle these higher temperatures?
For my 6V92, I'm told the O-ring seals between the cylinder liners and block will fail if I let it get much above 220 F. There must be dozens of other seals that were designed around the engine max. temperature (which when designed were assuming a water based coolant). What about the effect on exhaust manifolds, alternators, ECUs, wiring, insulation and other things around the engine that will see higher temperatures? Transmission will be running hotter too. It's an interesting idea to increase the operating temperature but the engineer in me tells me this is a major game changer. You only want to do it if the engine was originally designed around that higher temperature. JMO