Size  
 400
PSI
 500
PSI
 600
PSI
 700
PSI
 800
PSI
 1000 PSI
 1250 PSI
 1500 PSI
 2000 PSI
 2500 PSI
 3000 PSI
 4000 PSI
 5000 PSI
 6000 PSI
 7000 PSI
 03.0  
 0.9  
 1.0  
 1.1  
 1.2  
 1.3  
 1.5  
 1.6  
 1.8  
 2.1  
 2.3  
 2.5  
 3.0  
 3.3  
 3.6  
 3.9  
 03.5  
 1.1  
 1.2  
 1.4  
 1.5  
 1.6  
 1.8  
 2.0  
 2.1  
 2.5  
 2.8  
 3.0  
 3.5  
 3.9  
 4.3  
 4.6  
 04.0  
 1.2  
 1.4  
 1.5  
 1.7  
 1.8  
 2.0  
 2.2  
 2.4  
 2.8  
 3.1  
 3.5  
 4.0  
 4.5  
 4.9  
 5.3  
 04.5  
 1.4  
 1.5  
 1.7  
 1.8  
 2.0  
 2.2  
 2.5  
 2.7  
 3.1  
 3.5  
 3.8  
 4.5  
 5.0  
 5.5  
 5.9  
 05.0  
 1.5  
 1.8  
 1.9  
 2.1  
 2.2  
 2.5  
 2.7  
 3.1  
 3.5  
 3.9  
 4.3  
 5.0  
 5.6  
 6.1  
 6.6  
 05.5  
 1.7  
 1.9  
 2.1  
 2.3  
 2.5  
 2.8  
 3.0  
 3.4  
 3.9  
 4.3  
 4.8  
 5.5  
 6.2  
 6.7  
 7.3  
 06.0  
 1.8  
 2.1  
 2.3  
 2.5  
 2.7  
 3.0  
 3.3  
 3.7  
 4.2  
 4.7  
 5.2  
 6.0  
 6.7  
 7.3  
 7.9  
 06.5  
 2.0  
 2.3  
 2.5  
 2.7  
 2.9  
 3.3  
 3.6  
 4.0  
 4.6  
 5.1  
 5.6  
 6.5  
 7.3  
 8.0  
 8.6  
 07.0  
 2.2  
 2.5  
 2.7  
 2.9  
 3.1  
 3.5  
 3.9  
 4.3  
 4.9  
 5.5  
 6.1  
 7.0  
 7.8  
 8.6  
 9.3  
 07.5  
 2.3  
 2.7  
 2.9  
 3.1  
 3.4  
 3.8  
 4.1  
 4.6  
 5.3  
 5.9  
 6.5  
 7.5  
 8.4  
 9.2  
 9.9  
 08.0  
 2.5  
 2.8  
 3.1  
 3.3  
 3.6  
 4.0  
 4.4  
 4.9  
 5.7  
 6.3  
 6.9  
 8.0  
 8.9  
 9.8  
 10.6  
 08.5  
 2.6  
 3.0  
 3.3  
 3.6  
 3.8  
 4.3  
 4.7  
 5.2  
 6.0  
 6.7  
 7.4  
 8.5  
 9.5  
 10.4  
 11.2  
 09.0  
 2.8  
 3.2  
 3.5  
 3.8  
 4.0  
 4.5  
 5.0  
 5.5  
 6.4  
 7.1  
 7.8  
 9.0  
 10.1  
 11.0  
 11.9  
 10.0  
 3.1  
 3.5  
 3.9  
 4.2  
 4.5  
 5.0  
 5.5  
 6.1  
 7.1  
 7.9  
 8.7  
 10.0  
 11.2  
 12.2  
 13.2  
 12.5  
 3.9  
 4.4  
 4.8  
 5.2  
 5.6  
 6.3  
 6.9  
 7.7  
 8.8  
 9.8  
 10.8  
 12.5  
 14.0  
 15.3  
 16.5  
 15.0  
 4.7  
 5.3  
 5.8  
 6.3  
 6.7  
 7.5  
 8.3  
 9.2  
 10.6  
 11.8  
 12.9  
 15.0  
 16.8  
 18.4  
 19.8  
How to read Chart #1

First you need to know the GPM or your pump and it’s rated PSI.

Blue = the PSI of your pump.  Let’s say for an example that it is a 4,000 PSI Rated Pump.  Go across the top until you get to 4000 PSI.  

Now let’s say it is a 5.5 GPM Pump.  Under the 4000 PSI go DOWN until you get to 5.5 in the RED.  Now go left from the 5.5 until you get to the BLACK/SIZE column.

You will see the nozzle size that is required for your pump is 05.5
MOBILE WASHERS REAL WORLD NOZZLE SIZING
These 3 are typically Direct Drive Pumps that bolt directly to the engine and rotate the same RPM's as the engine rotates.  So if the engine is rotating at 3400 RPM's so is the pump.
If you have a…
…and want to get…
…you will need a…
…and will need at least a…
4.0 GPM Pump
3500 PSI
4.0 Nozzle Size
13 HP Engine
4.0 GPM Pump
4000 PSI
4.0 Nozzle Size
15 HP Engine
4.5 GPM Pump
3200 PSI
5.0 Nozzle Size
13 HP Engine
 All of the pumps from here on down will rotate by means of a V-Belt that attaches the pump pulley and to the engine pulley or by means of a Gear Box/Gear Reducer that is bolted to the pump and then bolted directly to the engine.
Gear Reducers are always the preferred method of mounting a pump.  Where a Direct Drive Pump will turn at the same RPM's as the engine the Gear Reduced pump will turn at less than 1/2 the RPM's of the engine because of the way the two internal gears are sized.  This is typical of what you would find in an automobile.  If the rear wheels on a automobile were turning the same RPM's as the engine we would all be setting land speed records daily.  A large gear meshed with a smaller gear allows us to obtain maximum horsepower from the engine while turning the pump (or rear wheels on the car) slower - thus extending pump life.
If you have a…
…and want to get…
…you will need a…
…and will need at least a…
5.0 GPM Pump
2900 PSI
5.5 Nozzle Size
13 HP Engine
5.0 GPM Pump
3500 PSI
5.5 Nozzle Size
16 HP Engine
5.0 GPM Pump
5000 PSI
4.5 Nozzle Size
22 HP Engine
5.6 GPM Pump
2500 PSI
7.0 Nozzle Size
13 HP Engine
5.6 GPM Pump
3500 PSI
6.0 Nozzle Size
18 HP Engine
5.6 GPM Pump
4000 PSI
5.5 Nozzle Size
20 HP Engine
8.0 GPM Pump
3000 PSI
9.0 Nozzle Size
22 HP Engine
8.0 GPM Pump
3400 PSI
8.5 Nozzle Size
24 HP Engine
8.6 GPM Pump
3500 PSI
9.0 Nozzle Size
28 HP Engine
10.0 GPM Pump
2000 PSI
15.0 Nozzle Size
18 HP Engine
10.0 GPM Pump
2500 PSI
12.0 Nozzle Size
24 HP Engine
10.0 GPM Pump
3000 PSI
11.0 Nozzle Size
27 HP Engine
The specifications below will all use #15 Nozzles simply because sizes between 12 and 15 and sizes between 15 & 20 are extremely hard to find.  Refer to nozzle chart on the previous page.
If you have a…
…and want to get…
…you will need a…
…and will need at least a…
11.0 GPM Pump
2000 PSI
15.0 Nozzle Size
20 HP Engine
11.0 GPM Pump
2500 PSI
15.0 Nozzle Size
25 HP Engine
12.0 GPM Pump
2000 PSI
15.0 Nozzle Size
22 HP Engine
12.0 GPM Pump
2500 PSI
15.0 Nozzle Size
27 HP Engine
13.0 GPM Pump
2000 PSI
15.0 Nozzle Size
24 HP Engine
13.0 GPM Pump
2500 PSI
15.0 Nozzle Size
30 HP Engine
CHART #2
CHART #1
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