The problem with putting air in our tires is that it’s often the last thing we think about. We see the air is low and tell ourselves “oh I must do that”, and then we forget. Now having enough air in your tires is extremely dangerous and can cause accidents. Fortunately, there is a simple and cost-effective solution- portable compressors.
Viair has a solid reputation for manufacturing portable compressors, in particular, the Viair 300p and the Viair 400p. Today, we are going to discuss the similarities and differences of these two off-road and on-road air compressors. We will add a comparison chart with all their features and some pros and cons. Our final verdict will help you with your choice.
We will start with what the Viair 300p and the Viair 400p have in common.
The Viair 300p and the Viair 400p can be used with any vehicle that has a 12v battery. All you need to do is attach the battery clamp power leads to the battery, attach the level style chuck to your tire valve and turn the air compressor on. The amount of pressure can be read using the 5-in-1 inline inflator/deflator hose and gauge.
Both the Viair 300p and the Viair 400p have a 12v, 30 amp motor. They are permanent magnetic motors.
PSI is a measurement of force, specifically pound (or pound-force) per square. The Viair 300p and the Viair 400p are both powerful compressors with a maximum PSI of 150.
This is a percentage that indicates the amount of time a compressor can be used in a certain period of time. The percentage is based on 100 PSI at a temperature of 72ºF. For an easy example, a compressor that has a 25% duty cycle means it can be used for 10 minutes and then off for 30 minutes. The Viair 300p and the Viair 400p have a 33% duty cycle.
CFM stands for cubic feet per minute and measures the speed of the airflow. The Viair 300p and the Viair 400p have a 2.30 CFM at 0 PSI.
The Viair 300p and the Viair 400p come with everything you need. You will receive a deluxe carry bag, a 25ft 5-in-1 inflator/deflator open-ended air hose with 120 PSI gauge, a heavy-duty sand tray with vibration isolators, a set of heavy-duty direct battery clamps, an 8ft power cable, a 3 piece inflation tips kit, an inline fuse holder, and an owner’s manual.
Side by Side Comparison
For the next part, we will focus on how the Viair 300p and the Viair 400p are different.
The design of the two portable compressors is the same, they are both compact and silver. There is a slight difference in their dimensions.
After confirming our measurements with Viair, this measures 9 x 7.5 x 4.9 inches and weighs 8.7 pounds.
The 400p is larger and weighs more too. It is 10.87 x 5.83 x 7.48 inches and 10.4 pounds.
The Winner Is- The Viair 300p
Air compressors are designed to be used with certain tire sizes.
This portable air compressor is suitable for tires up to 33 inches.
Here, the tire size is up to 35 inches.
The Winner Is- The Viair 400p
The fill rates are the approximate time it takes to inflate a tire at 12v.
To inflate a 33 x 12.5-inch tire from 0 to 30 PSI it takes 5 minutes. At 15 to 30 PSI is takes 2 minutes and 45 seconds.
For a 35 x 12.5-inch tire from 0 to 30 PSI is similar at 5 minutes and 5 seconds. At 15 to 30 PSI it’s just 2 minutes and 40 seconds.
The Winner Is- A Tie
Value for Money
For a high-powered portable air compressor like these, you could expect to pay anywhere from $250 to $500. The value for money also depends on what is included and the warranty.
It is well below the average cost and a little less than the Viair 400p. It comes with an excellent range of accessories and a one-year warranty.
Even though it is more expensive than the Viair 300p, it is still excellent value for money with the same accessories and the same one-year warranty.
The Winner Is- The Viair 300p
Pros and Cons
Just before our final verdict, we have a few pros and cons for the two Viair portable compressors.