Radiator capacity

DrPyro2k

Rush SR Owner
Jan 1, 2023
24
7
3
Houston, TX 77079
I did the "drain @ Radiator and lower engine hose" and when I refilled I think it took about a gallon of water. I'm afraid I didn't pay much attention to it, as I mixed 5 gallons of distilled water + waterwetter to keep on the shelf.
 
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John H

Rush SR Owner
Jan 1, 2023
39
14
8
De Leon Springs, FL 32130
There was a recommended funnel that had a bunch of adapters that fit the radiator. Basically let you connect a funnel directly to fill neck for filling/bleeding. Anyone have a link to that?
 

Bill Wright

Rush SR Owner
Jan 2, 2023
11
5
3
61
32401
What does that "bleeder" do?

I just refilled my car.I poured into radiator until full, started car and let it open thermostat, filled, done?
 

Sam Reed

Sandwich Retriever
RAW
Dec 14, 2022
47
36
18
Palmer, MA
What does that "bleeder" do?

I just refilled my car.I poured into radiator until full, started car and let it open thermostat, filled, done?
Yeah it's really not a lot: keep some extra coolant in the funnel, run engine, wait until bubbles stop flowing up, turn everything off and close it up. It just makes the process simpler and cleaner.
 
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John H

Rush SR Owner
Jan 1, 2023
39
14
8
De Leon Springs, FL 32130
What does that "bleeder" do?

I just refilled my car.I poured into radiator until full, started car and let it open thermostat, filled, done?
Its more for bleeding air out of the system, there's no expansion tank/reservoir. If it's anything like other cars I've had without these the apparent level changes depending on several factors, so while bleeding you have to constantly refill the neck only to have it spill out when the apparent level rises, then fill it again when it drops (and possibly reintroduce air if you don't quick enough) and repeat till you think all the air is out.

Or just keep that funnel full and run it for a while.
 
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DrPyro2k

Rush SR Owner
Jan 1, 2023
24
7
3
Houston, TX 77079
It is quite straight forward.... The kit comes with a variety of adapters and caps so you can attach the funnel to them. You will have to figure out which one is correct, but it is easy enough. The funnel comes with a rod plug, so you can plug it and pour what is left back in your bottle.

To be perfectly honest, the filling doesn't have to be 100% perfectly full. I find that I need to periodically fill a half a cup or more of fluid every few sessions anyways. The Rush has a well oversized cooling system that I can drive like a crazy person in 95F Houston heat and humidity and barely even exercise the cooling over a 30+ minute session. I find i'm more overheated than the car in those conditions.... Now my Alfa would start to pull power due to heat even when running nearly 100% water + waterwetter. Almost all of the other cars I have run with pull power much quicker than the Alfa did, many after 15 minutes. The only major exception seems to be Porsche, but not all of the drivers are pushing them THAT hard. The well sized cooling system was VERY VERY high up on my check list when looking at replacement cars. IMHO this is something that they did very well on....

Here is a data log from a bunch of laps at MSR Houston when ambient temperature was in the 90s (Inlet Air Temperature on the engine was 107-109 F or so, but that always shows a touch hotter than ambient). You can see that the temperature (bottom graph) basically flatlines for an entire lap around 210F. The red is the second lap in the session so the engine/system wasn't fully up to temperature, all of the other laps are at the end of the session. Like I said... robust cooling system

1673403474203.png
 
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