why does my surface cleaner have a small spray bar?

[Tiger Pressure Wash]

used to.
Got 2 4 gpm machines running with russ' siamese kit for 8 gpms now

 

[JDhomeservices]

Do you Run your 3 bar with a 4 GPM?

I never have. I got the 3 bar when I was using two 4 GPM machines linked together. I have been using it with my new 7 GPM 2000 PSI setup though, and it works alright. I wouldn't be opposed to trying it with 4 GPM 4000 psi though. When you're using that much pressure on residential driveways, splitting the pressure might be a good idea. I wonder if you can get 25015 tips?

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[Christopher]

You cannot split the pressure, only the flow.

You can lower the pressure with the unloaders or use larger orifice nozzles.

 

[JDhomeservices]

You cannot split the pressure, only the flow.

You can lower the pressure with the unloaders or use larger orifice nozzles.

So 4000 psi comes out of all 3 nozzles at the same time? It's not 1333 per nozzle?

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[Ralph Q]

So 4000 psi comes out of all 3 nozzles at the same time? It's not 1333 per nozzle?

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You are cutting the nozzles in half(or a third in your case) pressure is dictated by size of nozzles. If all three nozzles add up to the the size that you are supposed to be at. Example a 4000 psi, 4 gpm machine uses a #4 tip. For a two nozzle bar, you use 2 # 2's that makes 4000 psi coming out of each tip. For a three bar you can only use 3 #2's so you are only going to get 2100 psi out of each nozzle.

 

[john neilson]

So 4000 psi comes out of all 3 nozzles at the same time? It's not 1333 per nozzle?

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I was under the impression that the flow changes. the pressure change or reduces a lot based on nozzle size, length of hose. I run a 4GPM and my hoses are 100' long. My spool has 250 on it. The 2 spray works well for me. I will stick with it. I do want an 8 GPM soon. I bid A nice condo complex, With the neighboring condo complex already being one of my customers. That is an 8 GPM for me.

 

[john neilson]

You are cutting the nozzles in half(or a third in your case) pressure is dictated by size of nozzles. If all three nozzles add up to the the size that you are supposed to be at. Example a 4000 psi, 4 gpm machine uses a #4 tip. For a two nozzle bar, you use 2 # 2's that makes 4000 psi coming out of each tip. For a three bar you can only use 3 #2's so you are only going to get 2100 psi out of each nozzle.

How much PSI is really needed on concrete?

 

[JDhomeservices]

How much PSI is really needed on concrete?

With a good pre treat and some dwell time, not much. I did this one with my 7 GPM 2000 PSI machine. Anything over 3000 PSI seems to remove creme and/or leave etch marks.

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[john neilson]

Yeah, I left a circular mark once.

 

[Ralph Q]

How much PSI is really needed on concrete?

I traded in my 4.6 gpm 3000 psi machine for a 5.5 gpm 2500 psi machine and concrete is my main deal. I think 2000 psi is plenty for residential concrete, like Josh said you start to remove the creme over 3000. I was having that problem at 2400 psi with my hammerhead SC. Now that I am using a classic I can go the full 2500 without scalping the creme at all. My 2500 psi machine is a great little residential unit. That 4000 psi was just an example, I would never use that on a driveway around here, without being prepared to resurface it!

 

[john neilson]

I traded in my 4.6 gpm 3000 psi machine for a 5.5 gpm 2500 psi machine and concrete is my main deal. I think 2000 psi is plenty for residential concrete, like Josh said you start to remove the creme over 3000. I was having that problem at 2400 psi with my hammerhead SC. Now that I am using a classic I can go the full 2500 without scalping the creme at all. My 2500 psi machine is a great little residential unit. That 4000 psi was just an example, I would never use that on a driveway around here, without being prepared to resurface it!

I use 3500 on my whisper wash. I just keep it moving.