My YRV Turbo hit 100 degrees C today


Well I know it was a hot day today, but on the way home from work I noticed the water temp gauge on my Scangauge was in the low 90s but once on the get go the temps could rise to 100 degrees c. I can only put this down to the Evans waterless coolant as this is the first time my temps have hit this magic figure. Plus I have a race radiator on the car.
The only thing that doesn't help is that the water and radiator is also cooling not just the engine but also the turbo and auto box. What was weird is that turbo still wanted to over boost and give max power, so can only put this down to the Evans and the fact it doesn't boil at the high temps Smile

probably wont boil till about

probably wont boil till about 115c anyway as its a pressurised system and not of water content.

Full of ideas but no time to do them!!
youtube: Redfourtrack

Evans Waterless Coolant

I see Evans waterless Coolant has popped up as a topic again and I got thinking about this stuff once more. It interests me a lot but only from an academic and curiosity point of view. I know some on this forum do use it and I don’t wish upset anyone – if it works for you, go for it. Personally I am staying away from it.

The www is full of praise for the product and it is very difficult to find any views against it, which makes me worry I am really out of step with the whole world. I gotta say I just don’t understand this product and maybe I am missing something. By all means please tell me.

Firstly plain old water is the best fluid for transferring heat and it transfers heat more effectively than any other fluid, which is why it is used as a coolant, and indeed as a baseline to measure other fluids heat transfer properties. The problem with water though is that it freezes, and causes corrosion and subsequently it is always used in conjunction with additives, ethylene glycol and anti-corrosion chemicals, but the biggest proportion remains water because it is the best heat transfer fluid. The glycol and anti-corrosion additives are basically modifying the perfect coolant to suit real world use.

From what I read Evans is 100% glycol of some sorts, and glycol is only 2/3rds efficient as water at taking heat away, so my basic thought is if it does not transfer heat away as efficiently as water why is it rated so highly as a coolant. Evans, for me, falls down on its most fundamental purpose, which is transferring heat away. And this is the thrust of my basic doubts about it.

I understand Evans has a higher boiling point than water and it would need to have, because it is holding on to more of the heat, and that in turn will raise engine temperature, which can’t be good for an engine designed to run within a certain parameter. Off the top of my head I can think of many bad things happening from raised engine temperatures.

The electric fan will probably be running permanently because the ECU is designed to switch it on at a temperature based on a water/glycol cooling system and not one that is holding on to the heat more and raising temperatures. Cylinder head temperatures are going to climb and this can cause all manner of issues, many of them terminal. The engine oil is going to get hotter as well and be under more stress. There is too much detail to set down on this overheat issue, and none of it is good, so I will leave it at that.

Furthermore Evans being 100% glycol of some sorts it is subsequently thicker than water and this raised viscosity has to have a negative effect. For one the water pump is working harder to shift the same equivalent volume so the engine must be working harder with more heat being generated. It is interesting Evans sells high flow water pumps for some vehicles. There are more issues on this theme, but you get my drift.

The other downside for me is the cooling system has to be all but completely dry (97% is required but preferably 100%) of water before priming with Evans and if it isn’t it loses any supposed benefits. I defy anyone to completely dry out a coolant system without a complete tear down and blowing it with a hair drier for a week. For me this is way too much hard work.

I would like to hear some thoughts on this topic because I am darned if it makes sense to me to swap ordinary engine coolant for something that to my mind is unsuitable.

What do you reckon?