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Concept:
Welcome to my Foam Cannon Orifice Testing webpage, where I will attempt to find the sweet spot between foam production and pressure washer longevity.
One of the most common modifications performed by automotive detailing enthusiasts is changing the foam cannon orifice nozzle. The generally accepted belief is simple: smaller orifice sizes produce thicker foam while larger orifices reduce strain on the pressure washer. While this concept is widely repeated throughout online forums and social media, very little objective testing exists to quantify exactly how much these changes affect pressure washer performance and foam production.
As automotive enthusiasts, many of us routinely modify our vehicles in pursuit of improved performance, even when those modifications may increase wear or reduce component lifespan. Naturally, that same mindset often carries over into our detailing equipment. If a simple modification can produce thicker foam and improve the washing experience, many enthusiasts are willing to accept a modest increase in equipment wear provided it remains within reasonable limits.
This review seeks to determine the practical balance between maximum foam production and acceptable pressure washer loading by evaluating a wide range of stainless steel foam cannon orifice sizes using a controlled testing methodology. The goal is not simply to identify the thickest foam, but rather to identify the optimal compromise between foam quality, cleaning performance and pressure washer longevity.
Testing will be performed using the MJJC Pro V3.0 Foam Cannon and Active 2.0 Pressure Washer, measuring pressure, electrical load, foam characteristics and overall system performance across multiple orifice sizes ranging from 1.00mm through 1.40mm.
The results should help enthusiasts make informed decisions regarding foam cannon tuning while better understanding the impact these modifications may have on their pressure washing systems.
Why Was The MJJC Pro V3.0 Foam Cannon Selected:
For this testing I selected the MJJC Pro V3.0 Foam Cannon from among more than twenty foam cannons currently within my collection.
The reason is simple. The MJJC Pro V3.0 represents one of the highest performing foam cannons currently available and was specifically engineered to maximize foam production. Throughout my testing it has consistently demonstrated excellent foam quality, efficient chemical consumption and outstanding overall performance. If an orifice size change is capable of producing measurable differences in foam output, I wanted to evaluate those differences using a premium foam cannon designed specifically for maximum performance.
The MJJC Pro V3.0 also offers excellent repeatability, making it an ideal testing platform. Consistent foam generation is critical when attempting to isolate the effect of a single variable such as orifice size.
The objective of this review is not to determine whether the MJJC Pro V3.0 performs well. That has already been established. Instead, the objective is to determine whether its performance can be optimized further through careful orifice selection.
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Left - MJJC 1.25mm
Right - Generic 1.25mm |
Left - MJJC 1.25mm
Right - Generic 1.25mm |
Test Configuration
Active 2.0 Pressure Washer (2024 Original Model)
MJJC Pro V3.0 Foam Cannon
Stainless Steel Orifices:
- 1.40mm
- 1.35mm
- 1.30mm
- 1.25mm MJJC (Brass)
- 1.25mm
- 1.20mm
- 1.175mm (Brass)
- 1.15mm
- 1.125mm
- 1.10mm
- 1.05mm
- 1.00mm
Dedicated 20 Amp Circuit
12 Gauge Wiring
20 Amp Receptacle
Pressure Gauge
Amp Meter
Scale
Why this test is important, Understanding the tradeoffs
A smaller foam cannon orifice restricts water flow entering the cannon.
This generally produces:
Thicker foam
Greater air entrainment
Longer dwell times
However it may also:
Increase pump load
Increase motor load
Increase amp draw
Increase heat generation
Increase wear on switches and capacitors
Reduce pressure washer lifespan
Conversely, larger orifices generally:
Reduce system restriction
Lower amp draw
Lower component stress
Improve pressure washer longevity
But may also:
Produce thinner foam
Reduce dwell time
Increase water consumption
The challenge is determining where the optimal balance exists.
Important Disclaimer, your results may vary
While this testing provides a useful baseline, every pressure washing system is unique.
Factors that can significantly influence results include:
Pressure washer model
Motor design
Pump design
Household voltage
Circuit wiring
Extension cord use
Incoming water pressure
Water temperature
Water hardness
Hose length
Hose diameter
Hose construction
Spray gun design
Foam cannon design
Soap formulation
Soap dilution ratio
For these reasons, the exact pressures, amperage readings and foam characteristics observed during this testing should be viewed as representative of my specific setup rather than universal values applicable to all users.
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1.40mm Orifice Nozzle
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1.35mm Orifice Nozzle
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1.30mm Orifice Nozzle
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1.25mm MJJC Orifice Nozzle
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1.25mm Orifice Nozzle
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1.20mm Orifice Nozzle
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1.175mm Orifice Nozzle
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1.15mm Orifice Nozzle
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1.125mm Orifice Nozzle
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1.10mm Orifice Nozzle
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1.05mm Orifice Nozzle
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1.00mm Orifice Nozzle
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The objective of this testing was not simply to determine which orifice produced the thickest foam, but rather to identify the best overall
balance between foam quality, pressure washer performance, chemical efficiency, and long term equipment longevity.
To ensure meaningful comparisons, testing was performed using the same MJJC Pro V3.0 Foam Cannon, Active 2.0 Pressure Washer, identical wash
solution, and a controlled test methodology. Unlike many online demonstrations, the soap concentration was adjusted throughout testing to
maintain an approximate 0.50% Panel Impact Ratio (PIR). By keeping the final soap concentration reaching the vehicle essentially constant,
the primary variable under evaluation became the orifice size itself rather than changes in chemical concentration as a result of fluctuating
native dilution ratios resulting from the different orifice nozzles.
As expected, decreasing the orifice diameter increased system restriction, resulting in higher operating pressure and increased electrical
load on the pressure washer. Conversely, larger orifices reduced both pressure and current draw while allowing greater total water flow
through the foam cannon.
The factory installed MJJC 1.25mm orifice ultimately proved to be an excellent compromise between these competing factors.
It consistently produced outstanding foam quality while maintaining moderate operating pressure, reasonable electrical load,
and one of the highest total output volumes measured during testing. From a real-world perspective, it represented the best overall
balance of performance and efficiency.
Moving slightly smaller to the 1.20mm, 1.175mm, and 1.15mm orifices did produce a modest improvement in foam density and cling characteristics.
However, these gains came with steadily increasing pump pressure, higher electrical consumption, and greater mechanical loading on the
pressure washer. While the improvements were certainly visible, they were relatively modest considering the additional stress being placed
on the system.
Below the 1.15mm size, the law of diminishing returns became increasingly apparent. Pressure continued to rise and electrical demand
increased further, yet foam quality showed no additional improvement.
Although the Active 2.0 handled every orifice tested without surging, pulsing, or operational instability, the additional system loading
offered little practical benefit for routine washing.
Interestingly, the largest orifices tested, particularly the 1.30mm, 1.35mm, and 1.40mm sizes, still produced surprisingly good foam while
and the 1.40mm reduced pump workload significantly. For users primarily concerned with maximizing pressure washer longevity
(e.g. Professional Detailers) rather than absolute foam performance, these larger orifices may represent an attractive alternative with a
barely noticable if any compromise in foam density. For those of you with a revised 2026+ Active 2.0 model, remember that they now recommend
a 1.35mm orifice nozzle and these three choices should fit the bill if you run into issues using a 1.25mm.
One anomaly observed during testing involved the 1.125mm orifice. Unlike the other generic stainless steel orifices,
this particular nozzle was sourced from a different manufacturer and was noticeably shorter in overall length. Internal geometry,
inlet chamfer, manufacturing tolerances, and overall nozzle design can all influence flow characteristics beyond simple hole diameter.
As a result, its performance should not be interpreted solely as a function of its nominal 1.125mm opening, further demonstrating that two
identically sized orifices from different manufacturers may not necessarily perform the same.
Perhaps the most important conclusion from this testing is that smaller orifices do not automatically produce dramatically better foam.
Once the foam cannon reaches an efficient operating range, additional restriction yields progressively smaller improvements in foam quality
while continuing to increase pressure, electrical load, and overall stress on the pressure washer.
For the MJJC Pro V3.0 tested here, the factory supplied 1.25mm orifice appears to represent an exceptionally well engineered compromise.
While enthusiasts seeking the absolute thickest foam may choose to experiment with slightly smaller sizes, the testing suggests that the
modest gains achieved below 1.25mm are unlikely to justify the additional system loading for most users.
Based on the results of this testing, I will continue using the factory MJJC 1.25mm brass orifice in my MJJC Pro V3.0 Foam Cannon.
Although brass is generally more susceptible to corrosion than stainless steel and replacement MJJC orifices cost approximately $10 each
compared to around $3 for generic stainless steel versions, the factory orifice consistently delivered excellent foam while operating at
noticeably lower amperage than the generic 1.25mm nozzle. That reduction in electrical load, combined with its outstanding overall performance,
makes the additional cost worthwhile in my opinion for a premium foam cannon designed to maximize performance.
The decision becomes less straightforward when considering a budget foam cannon costing only $20 to $30. In that situation, spending several
times more for a premium replacement orifice may not offer the same value proposition. However, for enthusiasts looking to optimize a high end
foam cannon, I believe the MJJC factory engineered 1.25mm orifice remains the best overall choice based on both objective testing and
real world performance.
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