86 951 Driver

Just so everyone knows I have tried searching and found a thread from 2004 about Reverse Engine Cooling.

Has anyone had any experience with Evan's Coolant in the 951? It sounds very attractive due to the low pressure and the supposed elimination of steam pockets. I have heard it can make cars run a bit warmer than usual. I just put a lower fan temp switch in and would think that this would cause the fans to run non stop.

Experience? Good or bad?

Tom M'Guinn

There have been a few threads, such as the one linked below. George D seemed to be the biggest advocate, so you might try pinging him if he doesn't respond here. A number of people were talking about trying it, so this thread is a welcome update that might flush out some additional experiences since then....

https://rennlist.com/forums/944-turb...s-cooling.html

User 52121

Dunno about the 951 but I ran their coolant in all my race bikes - stuff worked great. Pricey though. When I rebuilt my motor last winter I planned to run it but couldn't find concrete info one way or another here, and just opted to run Dexcool instead.

toddk911

In my current 2.8L swap I plan to start running it.

The logic being to avoid steam/hot pockets which the 951 seems to be very prone.

bw993

I looked into using this for my 951, but decided not to after talking with someone at evans. They did
Not recommend because of turbo water pump.

86 951 Driver

Did they say that because of the viscosity of the coolant? Supposedly they have a new formula that is a little thinner now.

George D

http://www.evanscooling.com/

Evans works as advertised. I'm surprised someone at Evans told someone with a turbo coolant pump to NOT use their NPG+ as previously posted.

Tons on information available with some research. Jay Leno uses it..http://www.prolubricants.com/2012/ja...evans-coolant/

George D

A tad OT. I come from a dirt bike-quad racing background. When my 3.1 alum motor showed some heating issues in high ambient temps plus working the motor wanting a consistent 500whp, we realized we needed to source/create a new cooling system. We addressed the oil cooling part first, then addressed the radiator/coolant flow part.

I have a 2500HD that plows snow at my place in Greer, AZ. We used to get high temps when the snow plow was blocking air flow to the radiator. The stock overheat light would burn bright. Evans coolant took care of this issue. I run a DuraMax, and it runs Evans with no overheat issues no matter how hard this truck is worked.

We put this into my 3.1 motor because I know it works.
I've had plenty of overflow hoses on my 951 turbo cars overflow over the years. Especially once parked after a spirited run. I think we have this solved, and Evans helped.

George

User 41221

Evans makes a newer coolant that works just fine, its a lot less viscous than the previous version. Chris White has experience with it as well, I hope he chimes in.

Bri Bro

I am guessing you are talking about the NPG+C. I am wondering if it is as slippery as the old stuff was? That was the main reason I didn't give it a try but if the new stuff is better, it sure sounds like a good product.

I also saw a couple of sites that sell Evans claiming it is a coolant, not an antifreeze and that if a race or track rule was "no antifreeze", it was OK to use Evans. I am not sure this is correct since NPG+ is "propylene glycol with proprietary additives". I guess that they are defining antifreeze as ethylene glycol.

mtnman82

George - PM sent on the overflowing hose...

toddk911

Got this just recently from a very exp Porsche mech with a track team as well:

"The general consensus is that it's pretty good stuff, but there are a couple things to consider. First, the NPG coolant has a more difficult time controlling surges in temperature. Meaning that while constant temperatures will be lower, people are seeing higher "spikes" when driving the car hard and coming to a stop, etc.. Second, a lot of tracks won't allow it, requiring only water in the cooling system"

86 951 Driver

Since this can make your car run a little warmer, would I need to change out my fan temp switch to a higher temp one? I have the low temp one installed currently.

User 41221

No, you'll be fine with the lower one. Theres actually a fairly small temp difference between the two, your engine won't notice the difference if its running Evans.

User 41221

By the way, the guys saying you can't run the normal Evans on the track are right. I would *hate* to be the guy that dumped Evans on a race surface, as its far more slippery than glycol. I can't begin to imagine the liability problems you'd have, best case being having to pay for the track clean up, worst case being the cause of bent sheet metal, wrecked cars or people. If you want to run on the track, Evans makes a proper coolant for that purpose, please use it instead.