The 370 has been extra hot lately...

Mikey P

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Turns out, much to my surprise that the Scruz team set the SS12 to 8 flow...


Makes no sense especially considering the brass jets are pretty warn so I'm probably working with 10ish...
 
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What are you talking about? You usually don't have great heat? You must be making up for that usually with all the great compliments you get.
 

Nomad74

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Same thing with my 870. I run a 12 flow wand. The more I push through it, the hotter she gets.

I believe it has to do with how fast and how much water you can get to the tip of your wand from the heat exchanger. The water doesn't get hotter just sitting in the solution line.
 

Cleanworks

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On my little cds, after I replaced and insulated the heat exchangers with spray foam, I am getting 210-215 degrees at the truck. (if the temperature gauge is correct) Much better than the older, clogged up heat exchanger. Makes a noticeable difference. I use a 6 flow.
 

FredC

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also

more water through same line increases velocity
increases in velocity mean more turbulent flow
more turbulent flow means more heat transfer
 
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Meter Maid

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also

more water through same line increases velocity
increases in velocity mean more turbulent flow
more turbulent flow means more heat transfer
You are obviously right, I just experimented with my SS 12 and 25° weather. I got better heat at 600 psi than 450 psi at 6 flow.

The JoeDang at 8 flow, 450 psi is even hotter.

Seems like flow is more important than psi when it comes to you heat exchanger efficiency.
 

FredC

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Just ran my SS12 at 4 flow, 450 psi and got less heat than 6 flow, 450 psi.
4 flow 450psi ~1.25gpm
6 flow 450psi ~1.6gpm
6 flow 600psi ~2gpm
8 flow at450 ~2.1gpm


Did you record the temps?




*just eyeing the chart ...not doing the math
 

Meter Maid

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is that continuous flow?
or on/off trigger duty cycle while cleaning?
(which and can and does vary per operator)

..L.T.A.
It was non-scientific as can be.

I laid on the wand for 30 seconds on each test and noted the temperature.... in my mind, which is clearly a problem.

I went back through the settings/wands a second time because I know my little HX is goofy at low temperature.

My blower was capped off for this

6 flow, 450 psi... max 170 degrees at about 20 seconds. About the same on the second go around.

8 flow, 450 psi... max 182 degrees at about 15 seconds. Again, about the same the second time.

4 flow, 450 psi... max 165 at about 22 seconds. Same the second time.

4 flow at 600 psi got to 185 around 15 seconds.
 

Cleanworks

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It was non-scientific as can be.

I laid on the wand for 30 seconds on each test and noted the temperature.... in my mind, which is clearly a problem.

I went back through the settings/wands a second time because I know my little HX is goofy at low temperature.

My blower was capped off for this

6 flow, 450 psi... max 170 degrees at about 20 seconds. About the same on the second go around.

8 flow, 450 psi... max 182 degrees at about 15 seconds. Again, about the same the second time.

4 flow, 450 psi... max 165 at about 22 seconds. Same the second time.

4 flow at 600 psi got to 185 around 15 seconds.
You want to stand beside your truck and trigger the wand while looking at the temp gauge. See how long it maintains the temperature before it begins to drop.
 
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Meter Maid

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I’m not really worried about it, it’s just interesting that flow seems more important than psi when it comes to keeping up the hot water when it’s cold.
 

Matt Wood

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I always thought of it this way:

Prevent the water from bypasssing in the waste tank by moving more water, so It'll bypass through your wand, with higher pressure or flow.
 
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