For those that are using Evan's NPG+, how much expansion are you seeing into your overflow tank?

The reason I ask is that I'm considering replacing the stock overflow tank with a smaller one (1 qt) so I can relocate it. Will this be enough and be able to hold about 1/3 full when cold?

Thanks!

Attila

 

I think it depends on if you run it with zero pressure or not.
I run mine at zero pressure as recommended by Evans and I see less than 2 cups or so.

Running it pressurized I think you would see more.

 

i always want to know more about this.
still keep the t-stat just cut the rubber seal under the cap right?

 

Evan's NPG+ ???

 

http://www.evanscooling.com/main25.htm

It's a waterless coolant.

If you want zero pressure, then yes just remove the rubber piece on the coolant cap.

I was planning on running a 7psi cap for better flow. I'm using the stock thermostat with (4) 3/16 th's holes; 3 at the bottom and one where the jiggle pin was. The holes are also for additional flow.

 

I'm running NPG+ and I have a 1 quart expansion tank that I stole from Damian.

I leave the top of the tank open to atmosphere and I end up with it about half full when fully warmed up.

Damian (also running NPG+) has a one quart AST where he plugged the two extra hose barbs. He doesn't have any overflow issues either, but he doesn't leave a vent to atmosphere so the system probably builds a small amount of pressure.

Sam and Ben have 2 quart tanks, vented to atmosphere, one with a valve breather, one with a brass filter. Both running NPG+ no pressure, maybe 1/4 to 1/3 full at full boil... er, no boiling, but fully warm.

 

Perfect!

Thanks for the info.

 

How much overflow you have depends on how big your cooling system capicity is.

I run a Griffin 27"x19" x2.5" radiator and have a 1 qt overflow bottle. NPG+ at 0 psi.

Overflow near empty cold, 3/4 full warmed up and at the top at high temps (low 90s C).

I would opt for larger overflow tank if I were to do it again so I could see if I need to add coolant when cold- before it is warmed up and showing in the sight tube...

 

Maybe I'll just use the stock reservoir and just put a filter inline.

The main reason I wanted to switch to a smaller tank is so I could relocate. It's a bit in the way with the oil cooler line and I hate how all the fine dirt particles used to get sucked back into the engine.