What tips should I use for my new 19" whisper wash classic?

LB Mobile

New member
I have a 4.7 gpm 3500 psi hot water machine and I'm told 2 - 2502 tips is what I should use for top performance of my surface cleaner. I have K7 unloader and they have top end of around 3600 psi... With the mentioned tips the psi would be around 5500. ... OR should I be using 2 - 25025 tips to keep my psi around 3500?


Sent from my iPhone using Tapatalk
 
I'd personally use 2.5 orfice. 2's and you wont be running the full 4.7gpm. 3500 is more than enough for concrete

Sent from my LG-H811 using Tapatalk
 
From what I understand about the K7 - you don't want to go with nozzles smaller than the full flow for the pump. Trapped pressure unloaders will allow the excess to bypass back into the tank but the K7 is either in bypass or not....there is no middle ground. Defiantly go with the larger nozzles.

Daniel Simmons
Pressure Washing America, LLC
commercial property maintenance
 
You need to use at least 25025's or larger. I would use 2503's personally. Once you get over 2500 psi, there goes the cream off the cement. Anyone who is tipped over 3000 psi better have an awesome insurance policy if they do residential work. If you pass over cement a few times with high pressure, you will turn the finish from "smooth" to "exposed aggregate".
 
You need to use at least 25025's or larger. I would use 2503's personally. Once you get over 2500 psi, there goes the cream off the cement. Anyone who is tipped over 3000 psi better have an awesome insurance policy if they do residential work. If you pass over cement a few times with high pressure, you will turn the finish from "smooth" to "exposed aggregate".

Hmm.. Interesting. Thx
 
Am I missing something

You got 2 tips in that surface cleaner. You don't multiply it, you divide by 2. The 2502 should be fine. with 3500 psi machine that's going to give you about 1750 each give or take for hose length. K7 unloader rated for 3000psi but will stretch to about 3500. Unloader shouldn't have much to do with your nozzles.
 
You got 2 tips in that surface cleaner. You don't multiply it, you divide by 2. The 2502 should be fine. with 3500 psi machine that's going to give you about 1750 each give or take for hose length. K7 unloader rated for 3000psi but will stretch to about 3500. Unloader shouldn't have much to do with your nozzles.

I disagree. With 2 - 2502 tips id be either limiting water flow to less than 4.7 gpm or increasing psi to over 3500 if flow stays at 4.7
 
You got 2 tips in that surface cleaner. You don't multiply it, you divide by 2. The 2502 should be fine. with 3500 psi machine that's going to give you about 1750 each give or take for hose length. K7 unloader rated for 3000psi but will stretch to about 3500. Unloader shouldn't have much to do with your nozzles.
Uuh, with all due respect - I totally disagree with everything in this statement, except the part where you have two tips in a surface cleaner.
Using 2 @ 2502 Tips at 4.7 gpm, you are over 4500 psi. It's the same as using a single 4.0 orifice tip. At that point, yes, the unloader would take over.
Unloaders and nozzles have everything to do with each other. Nozzles is what actually controls the pressure, the unloader "unloads" whatever pressure that it needs to so that you don't destroy your pump.
 
You need to use at least 25025's or larger. I would use 2503's personally. Once you get over 2500 psi, there goes the cream off the cement. Anyone who is tipped over 3000 psi better have an awesome insurance policy if they do residential work. If you pass over cement a few times with high pressure, you will turn the finish from "smooth" to "exposed aggregate".
Spot on. Nothing worse than shoveling the cream coat into a five gallon bucket at the end of the driveway.
 
Last edited:
Uuh, with all due respect - I totally disagree with everything in this statement, except the part where you have two tips in a surface cleaner.
Using 2 @ 2502 Tips at 4.7 gpm, you are over 4500 psi. It's the same as using a single 4.0 orifice tip. At that point, yes, the unloader would take over.
Unloaders and nozzles have everything to do with each other. Nozzles is what actually controls the pressure, the unloader "unloads" whatever pressure that it needs to so that you don't destroy your pump.

I totally agree with the above statement. Easily put, if you have a single tip in your gun, let's say a 25055 and you get the full advertised pressure with that tip from your pump and unloader then you divide the 5.5 by 2 when you talk about a surface cleaner. That is to get the max advertised pressure out of your surface cleaner. The larger the tips, the less pressure more flow. Good luck! Stick with the larger ones, if it gets the job done then great if not drop down a slight bit.
 
A little OT- But I'd love to know the physics as to why some people with 8 GPM machine,..used with WW Classic 19",... can use (2) 2505 nozzles and have it want to fly away,..while others use the same tips or even 2504.5 and have no lift off issues. I sometimes wonder if some of these units were made slightly heavier? I know some guys are using (4) 2502.5 nozzles and no issues. I tried that too,..still didn't work. I am now at 6 GPM nozzles,..losing pressure,..but really just trying to figure out the physics of this? The 6 GPM nozzles work alot better,..But,..I still feel like I'm holding it down to a degree,..and the back end still wants to lift off.

It seems some guys like me,..have to add weight,..about 5 LBS. if you want to use the correct nozzles. While I see videos and other statements from guys who have no issue with 8 GPM and the correct nozzles.

I like the WW Classic it works awesome,..and one of its best features is it's light weight,..but for me,..that benefit goes away with this issue.

I added the 90 degree at the swivel for less obstruction with that big loop of hose sticking out,..although some claim that helped keep the unit down,..didn't make any difference in my case.

The PSI I'm at is around 1800,.and its wanting to lift off,..while others must be around 2500-3000 or higher and no issues,..UGHHH,..Ha,Ha....

Appreciate any answers,..but really just venting,Ha,Ha,..

Jeff
 
A little OT- But I'd love to know the physics as to why some people with 8 GPM machine,..used with WW Classic 19",... can use (2) 2505 nozzles and have it want to fly away,..while others use the same tips or even 2504.5 and have no lift off issues. I sometimes wonder if some of these units were made slightly heavier? I know some guys are using (4) 2502.5 nozzles and no issues. I tried that too,..still didn't work. I am now at 6 GPM nozzles,..losing pressure,..but really just trying to figure out the physics of this? The 6 GPM nozzles work alot better,..But,..I still feel like I'm holding it down to a degree,..and the back end still wants to lift off.

It seems some guys like me,..have to add weight,..about 5 LBS. if you want to use the correct nozzles. While I see videos and other statements from guys who have no issue with 8 GPM and the correct nozzles.

I like the WW Classic it works awesome,..and one of its best features is it's light weight,..but for me,..that benefit goes away with this issue.

I added the 90 degree at the swivel for less obstruction with that big loop of hose sticking out,..although some claim that helped keep the unit down,..didn't make any difference in my case.

The PSI I'm at is around 1800,.and its wanting to lift off,..while others must be around 2500-3000 or higher and no issues,..UGHHH,..Ha,Ha....

Appreciate any answers,..but really just venting,Ha,Ha,..

Jeff
Yea I've seen a lot of guys put ankle weights on those

Sent from my LG-H811 using Tapatalk
 
A little OT- But I'd love to know the physics as to why some people with 8 GPM machine,..used with WW Classic 19",... can use (2) 2505 nozzles and have it want to fly away,..while others use the same tips or even 2504.5 and have no lift off issues. I sometimes wonder if some of these units were made slightly heavier? I know some guys are using (4) 2502.5 nozzles and no issues. I tried that too,..still didn't work. I am now at 6 GPM nozzles,..losing pressure,..but really just trying to figure out the physics of this? The 6 GPM nozzles work alot better,..But,..I still feel like I'm holding it down to a degree,..and the back end still wants to lift off.

It seems some guys like me,..have to add weight,..about 5 LBS. if you want to use the correct nozzles. While I see videos and other statements from guys who have no issue with 8 GPM and the correct nozzles.

I like the WW Classic it works awesome,..and one of its best features is it's light weight,..but for me,..that benefit goes away with this issue.

I added the 90 degree at the swivel for less obstruction with that big loop of hose sticking out,..although some claim that helped keep the unit down,..didn't make any difference in my case.

The PSI I'm at is around 1800,.and its wanting to lift off,..while others must be around 2500-3000 or higher and no issues,..UGHHH,..Ha,Ha....

Appreciate any answers,..but really just venting,Ha,Ha,..

Jeff

That's a good question. Wish I knew the answer. My 10 gpm @ 2500 psi wants to lift off, a lot more than my 3000 psi 10 gpm machine. Same Classic. I also get less lift the longer my hose, Obviously. I use the ankle weights that you can take them out in increments. It keeps the Classic floating but not flying.
 
Thanks Ralph,..I run 200' 3/8" from a reel,..Yes,..finding that happy spot is the ultimate goal. I watch that Michael K. video on YouTube and am jealous on how well under control it is Ha,Ha,..,..If I had those nozzles he's using I'd look like I was flying a kite. Yea,..your dilemma is weird,..you'd think the 3000 PSI would be worse? Luck of the draw I guess.

I thought about using a wider pattern,..such a s a 40 degree,..not sure why that would help,..but I'm grasping at straws.

*Even though the "fix" is adding weight,..I'd rather not. If others didn't work I'd understand it better,..But when some do and some don't,..makes me scratch my head.

**Is there any chance these guys that don't have an issue are running less RPMs? I REALLY doubt that would be the case,..as most people understand that flow is important,..and cutting back RPM's would lessen the PSI along with flow.

Jeff
 
Thanks Ralph,..I run 200' 3/8" from a reel,..Yes,..finding that happy spot is the ultimate goal. I watch that Michael K. video on YouTube and am jealous on how well under control it is Ha,Ha,..,..If I had those nozzles he's using I'd look like I was flying a kite. Yea,..your dilemma is weird,..you'd think the 3000 PSI would be worse? Luck of the draw I guess.

I thought about using a wider pattern,..such a s a 40 degree,..not sure why that would help,..but I'm grasping at straws.

*Even though the "fix" is adding weight,..I'd rather not. If others didn't work I'd understand it better,..But when some do and some don't,..makes me scratch my head.

**Is there any chance these guys that don't have an issue are running less RPMs? I REALLY doubt that would be the case,..as most people understand that flow is important,..and cutting back RPM's would lessen the PSI along with flow.

Jeff

From what ive read/seen most engines used in builds underpower the pumps when at full pressure. Plus friction loss due to hoses... etc. My 10 at 2500 udor pump ive always had to fight to keep down way way more then my 8 at 3000 general pump.

Id bet we could do some testing and figure some of this out more. See how much water really is coming out per minute on the surface cleaner... PSI at the gun... Lead us in the right direction of why it seems so many people are getting different results from lift from 8-10 gpm.

I mean it also depends on unloader settings to. If i put tips for 10 at 2500 on my SC and i set my unloader with nothing more then a tiny whip hose, when i have 200' of 3/8 im bypassing a decent ammount of water due to the friction loss.
 
Back
Top