Evans coolant swap

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logres

Registered
Finally switched out the fluid. Was easier than I thought it would be. The only weird part was blowing air into the heater core to get the old coolant out, but it worked. I poured the prep fluid in, which floats the rest of the water out of the system. Worked fairly well. After filling up with the new stuff, I ran the engine at ~2500 rpms for about 5 minutes to boil out the rest of the water. Got the needle up to the "N".

I've been driving around for a couple weeks now. Engine runs about 5-10 degrees hotter ("A" with 180 tstat), and peaks higher during open throttle bouts, but power output seems higher and more consistant. Engine runs much smoother down low. It's obvious that the engine is managing itself a lot better without the hotspots in the block and heads. I'm also seeing an immediate 10% increase in cruise-controlled freeway mileage (28 to 31 mpg)...the computer has NOT been reset yet. I'm curious to see what effect that will have.

Anyway, for $160 it is not a cost effective power adder, but it does eliminate engine heat issues, which was my main goal. The better mileage was an unexpected bonus for me. I give Evans a thumbs up...mainly for cars in hot climates.
 
Wow that is a lot of claims for just a coolant swap...
Increased fuel mileage, power and smoother running engine?!

Only way to see if this actually works to evans would be put in a 205F T stat and see if the engine runs smoother and more efficiently...
 
maxmk8 said:
Only way to see if this actually works to evans would be put in a 205F T stat and see if the engine runs smoother and more efficiently...
Click to expand...

I might do that if it wasn't a total pain to swap that thing out.

Just ask JP. His avatar is a picture of him after he finished swapping his out.
 
logres said:
I might do that if it wasn't a total pain to swap that thing out.

Just ask JP. His avatar is a picture of him after he finished swapping his out.
Click to expand...

:har:

Give us an update after living with the Evans coolant a while. :wink:

So you just drained the fluid and blew out the heater core? Did you disconnect the hoses at the back of the block???
 
driller said:
Give us an update after living with the Evans coolant a while. :wink:

So you just drained the fluid and blew out the heater core? Did you disconnect the hoses at the back of the block???
Click to expand...

It has yet to get over 100 here in LA, so I have not yet ruled out ever higher operating temps.

As it stands, the system can barely keep the temps down to 180 in 80 degree weather with the AC off in city driving. (I like the windows down). In aggresive driving, the temp rises quickly to about 205. I knew this going into it after reading how the Evan's fluid is actually only about half as efficient in transporting heat...some of that mitigated by the fact that it won't cavitate like water does at about 2500 rpms. Engines running on Evans can operate at optimal performance up to around 250, where the engine oil itself begins to take abuse. If the system has trouble keeping cool on very hot days, I'll be purchasing an Evans thermostat (very high flow), followed by an electric coolant pump if need be. The weapon of last resort is an Evans radiator, but I doubt it'll get that far.

Regarding hoses at the back of the block...I uh...(eyes rolling around wildly)...nobody told me about hoses back there. I did however jack the rear of the car up about two feet to aid in draining. That and use of the prep fluid ensures that all but about 8 oz of water coolant are left in there. This remaining water boiled off about a week after the swap; the coolant level has remained constant for 1-2 weeks now.
 
logres said:
Regarding hoses at the back of the block...I uh...(eyes rolling around wildly)...nobody told me about hoses back there. I did however jack the rear of the car up about two feet to aid in draining. That and use of the prep fluid ensures that all but about 8 oz of water coolant are left in there. This remaining water boiled off about a week after the swap; the coolant level has remained constant for 1-2 weeks now.
Click to expand...

The heater hoses at the back of the block are not user friendly, that's why I asked. So how did you 'blow out' the heater core?
 
driller said:
The heater hoses at the back of the block are not user friendly, that's why I asked. So how did you 'blow out' the heater core?
Click to expand...

Human wind power...I disconnected the hose and blew into it. I could hear gurgling after most of the fluid came out. I poured prep fluid in there and blew into it again.
 
I did that with mine when I did the lower rad hose that was leaking and I repainted my bypass tube, and put back in almost full capacity of the system, so I think it gets 95%+ out... The passages are great too as they are perfect size for the shop vac hose.
 
Update.

100 degrees yesterday on my 10 city mile drive home from work. Too hot for me. I rolled up the windows and blasted the AC and drove fairly aggressively.

Hung around the "O" for most of it...never higher. I'm guessing that's about 240 degrees? Anyway, the engine and management system didn't miss a beat. It drove like it was 60 degrees outside. No knocking or timing retardation that I could tell with the few WOTs I did. Before Evans, the engine performance dipped considerably when the temps got above 220. Not anymore. Evans is a winner.
 
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