MSDS for Evans NPG. 69%, ethylene glycol

http://contrails.free.fr/temp/NPG+_MSDS.PDF

In the video, Jay Leno says you can drink Evans coolant.

Are items 1 to 3 on their web site? Is so please post link.

Did they provides reasons why bypass thermostat is not suitable?

There should be no vacuum if the cap is left loose and run at zero pressure. Something not jiving there.

What's the reason for blocking the water pump weep hole?

I don't know the answers to any of these questions, that is why I posted here. It's not on their website, which was kind of my complaint, and the reason I'm curious now. It's in the printed instructions sent with the product.

As to the chemical composition, I'll try to get an updated MSDS, that one is 11 years old, and everything I read about, and even on Jay Leno's show they say it's propylene based...with some other "chemistry" they don't wish to disclose.

This reference discusses the thermostat a little.
http://www.motor-talk.de/forum/aktion/Attachment.html?attachmentId=725143

Thanks, that is the instructions I got with the product.

Given the "high performance coolant" is actually ethylene glycol, I'm rethinking this entire thing and wondering if it's worth all the hassle at all.

Some here had mentioned using it before, and I was hoping they would weigh in.

Per the instructions posted, Evans makes 3 kinds

Undiluted Evans Waterless Coolants:
High Performance Coolant
Powersports Coolant
NPG

NPG is the only one that is propylene glycol based.
For all Evan's waterless coolants, if you run low or leak some out you are screwed (unless you carry spares) because you can't add water.

This is very true, but I always carry coolant in a 30+ year old car...except for my Karmann Ghia obviously. :D

Since it is not water based the specific heat it can absorb and release will be less than a product mixed with water. That is for a given coolant flow.

Really a good functional normal system does not need this product. I am not against the product. Still I would only personally consider it under very limited circumstances. I suspect they want the bleed hole closed on the water pump because the molecular size of the of the product is smaller than the poison type glycol I think but an not certain of..

For example you can have a car on straight water with no leaks. Remove and add a mix of fifty percent water and regular anti freeze and you may see leaks. The molecular size of anti freeze must be smaller than water or they slide easier. I an not certain of the term to use for slide easier.

An example is in order. Back in the day of my 300.00 immaculate 50 mercury. I purchased it in the spring. It had water as coolant. In the late fall I replaced it with the standard protective mix. Both water pumps started leaking almost immediately. Ford product flatheads had two water pumps that doubled as motor mounts If I remember. I still have one in the garage but the three mentioned cars are long ago.

If that car was not bad enough pricewise by todays standards. My 39 ford for 125.00 with 20K on it. Or my 47 ford with 27 k for 140.00. No kidding guys and all three needed nothing except the 48 ford needed a new muffler and pipe. The cost back then was 27 dollars for parts and labor at a muffler shop.

Things have changed a little it seems or it is my imagination. Back then nobody or very few liked really older cars much but I did and sought good examples out. It was in a time frame that the prestige of what was driven seemed more important than it does today. If you did not drive a new or almost new car was a downer.

If you have any kind of coolant leak it gets expensive. My freeze plugs all leak in winter.

Yeah, leaks are bad, it's more pricey, but the theory here is that the system doesn't pressurize, so the potential of leaks is reduced.

IDK but I think this Evans NPG is more trouble than it is worth considering all the issues with its installation and maintenance and scarce availability. Using the correct OE coolant and routine maintenance is what I will be doing. Green coolant is not the correct coolant btw for our engines. I think VTMbz just had to replace a head gasket in his low miles 190D that had green coolant in it for God knows how long.

How did they get that way? Most freeze plugs don't leak unless the engine has no antifreeze and froze over in winter.

They got that way from corrosion and electrolysis. The term "freeze plug" is a misnomer, they are actually core plugs closing the sand cores that displaced the cylinders when the block was cast.

Corrosion and electrolysis are two of the things waterless coolant is supposed to eliminate.

I called the Evan's people today, real nice people, and they say for a daily driver, just put it in a dry or properly prepped system. Don't bother with the weep hold unless you really want to. And the thermostat and stuff is more intended for hotrods, where people are getting 1,200 horsepower and need every bit of cooling they can get.

The lower risks of corrosion, electrolysis, cavitation, and etc...I think I'm going to go for it.

Thanks all.