Evans NPG+ coolant...
 

I just filled my 3rd gen with Evans coolant. First reaction, it warmed the car quicker to operating temperatures. Second, It's cooler by 5-10 degrees C. that is 41-50 degrees F. and I'm going to Las Vegas this weekend and find out more results...stay tuned. Anybody has used this before can share some info.

Are you running pressurized or not?

I need to get some Evans next time I flush my coolant.

Cooler is better
 

Please post where to purchase Evans coolant?
Do you still use Red Line Water Wetter and/or mix with distilled water?

hi,

how did you drain all of the old coolant? thanks

GoRacer: www.pineappleracing.com sells them

Legend: Drain the radiator, then drain the block (bolt between the plugs area, with an untapped hole under it, VERY EASY to miss).

I've done it before. Buy some Sierra coolant. Run ur system with 100% sierra coolant and drive it around once for a little bit (not far the temp will go up, in the event that it does, pull over and hang out for a little bit). While driving around have the heater open all the way. Then when u finish, drain all of it. Now you are ready to put in the Evans.

If anyone has figured out a good place to get 0 Pressure or low pressure caps that fit our cars please let me know. I tried taking the seal off the stock one, and it just resulted in the evans overflowing out of the neck.

I got my 0 pressure from the coolent filler housing. The FD had a non pressure cap on the coolent filler housing and has a pressureized cap on the AST.

David

Evnas is great because you can drink it! Its good for pets too!

I followed what pineappleracing.com's instructions:
Installation

Evans NPG+ is non-aqueous, meaning it doesn't like water. It is also incompatible with ordinary coolants. To convert to NPG+, you need to get rid of all the moisture in your cooling system, as well as all traces of incompatible coolant, thus avoiding contamination. The way to do this is to flush your cooling system as if doing a normal coolant change: warm the car up with the heat on (to open the heater core valve), and drain the radiator and engine block. Also be sure to siphon off any coolant in the overflow bottle and/or air separation tank (3rd gen RX-7s). Once the system is thoroughly drained, there will still be some residual incompatible coolant and water. Here, we use an intermediate product that will absorb moisture and is compatible with Evans NPG+: Sierra coolant. Sierra is a "pet friendly" nonpoisonous coolant you can find almost anywhere. Since it is made with Propylene Glycol (like Evans) but is aqueous like Ethylene Glycol (ordinary coolant), it is the perfect thing to do the job. It will absorb any residual moisture and cleanse the system, but any residual Sierra will not contaminate the Evans product. After flushing the system as usual, fill with straight Sierra coolant (no water) and drive the car around for 15-20 minutes with the heat on, then drain and refill with Evans NPG+. Don't forget to add some to the overflow bottle, but not too much -- Evans NPG+ expands a bit more than ordinary coolant when hot. The procedure might sound complicated, but it's easier than it seems and is well worth doing. It will also be the last time you need to flush and refill your cooling system as normal preventative maintenance! In the future, if you need to drain the cooling system for any reason, just capture the NPG+ in a clean container and refill when you're done. To convert your cooling system to zero pressure, just remove the rubber seal on the inside of the radiator cap. If you want to run a low pressure system, however, you will need to find the appropriate aftermarket cap. We have found zero pressure works just fine. We recommend, however, that you use the stock, unmodified pressure cap for about a week before converting it to zero pressure. This will help get out any air pockets that might be trapped in the system.

Really good info, Thanks 93blackr1. :)

But what does it taste like?

Waiting on heating before after temps to be posted. Let us all know how it goes...will try this in the summer.

Aspec,

So u used another fillerneck cap on ur AST?

Why would one not want to run pressurized? What are the benefits of not running pressurized when switching to the Evans? Why not just leave the stock caps?

Nothing blowing up, hoses radiators, ast's, etc...

dunno if this makes sense. Evans is meant to run at 0 pressure. so if u leave the pressure up on the system, PV=nRT, which means as pressure goes up, so does temperature. Right?

That is the ideal gas law. The coolant is not a gas.

I am really not sure why running it under pressure is bad, or even if it really is bad. Since you don't have to run it under pressure to raise the boiling point, I can see why running it without pressure is good. But I still don't understand why running it under pressure is bad. Anyone?

I plan to run mine at 7 psi because that was the low pressure cap I got for my "Gooseproductions" AST replacement.

-Max

no I eliminated my AST. in my opinion they are not needed, I can bleed the air out myself+ I don' t like the way it looks, I like a clean engine bay.

David

Do you mean the replacement for your Pettit AST or Stock AST cap? Also, what to do about the filler neck cap. I've searched and found little. Somone said to remove the rubber underneath ??? Thanks :cool:

Is there a way to make the cap on a Pettit aluminum AST pressureless?? I don't think they sell one...or do they. A 0 pressure Stant cap would be a perfect replacement....Hold up...Now that I think about it I remember seeing a stant cap that was not springloaded. :confused:

Evans themselves sells 0 pressure caps. Dunno if they fit our cars, I've emailed and have recieved no response, and I never have a chance to call. If I do I'll post it.

I got an AST made by someone from our local car club that takes the standard caps. I found a 7 psi Stant cap at the local auto parts store and will be running that. I have had no AST for several years, and decided to add one so that I could use standard caps and have a little more coolant in the system. Evans seems to like ASTs, so I figured it might be beneficial as well.

You should leave the filler neck cap alone, so that only the AST cap will vent. I think you can use a filler neck cap on the stock AST for zero pressure applications.

-Max

Thought you could fool me! :hahaha:
41F-50F cooler is wrong! That is the direct conversion for only 5 and 10C.

85C = 185F
80C = 176F
---------------
05C ~ 009F

Thus a 5 degree drop from 85C to 80C is equivalent to a 9 degree drop F.

I just converted to the evans coolant, no water wetter needed anymore and no more concerns about exploding coolant hoses. Have long since eliminated the AST and therefore freed up the AST's 0 psi cap for use on the system, 0 pressure should prevent swelling of coolant hoses and may put less of a load on the coolant seals???

No issues to date and coolant temps appear to be similar to before. I cannot give A/B temperature data because I also used the Datalogit to change fan temps. I'll find out if this stuff works as advertised in the next few months as Houston summer kicks in.

Kyle

ROTFLMAO! But - does it give you a good buzz?