Pressure washers can be safe for cars when used with wider nozzles and lower pressures. Choose a pressure washer with a suitable psi (pounds per square inch) rating, typically between 1200 and 2200, and use a wide spray nozzle (25 to 40 degrees) to minimize the risk of damaging the vehicle's paint and other surfaces.
Use the right amount of pressure
Although many electric pressure washers produce a pressure of about 1900 psi, you should only use a water pressure of 1500 psi or lower on your car. You'll need to look for a low-pressure machine that's a bit less aggressive than the standard.
Too much pressure (generally anything more than 1,900 PSI) can damage the paint job on your vehicle. If you're determined to do so, keep the following tips in mind. In addition to using the right pressure (1,000 to 1,200 PSI), make sure you use the correct nozzle.
Light-duty pressure washers are rated at 2,000 PSI or less and are suitable for cleaning automobiles, motorcycles, boats, bicycles and all-purpose cleaning. Medium-duty pressure washers produce 2,000 to 3,000 PSI and can be used to remove grease and grim from concrete, sidewalks, decks and siding.
2,000 - 2,900 PSI: This is a moderate strength unit used heavier residential tasks. These units are commonly sold as either electric or gas pressure washers. 3,000 - 6,900 PSI: These high pressure models are what professional pressure washers and contractors usually use.
High pressure is technically anything compressed to over 150 pounds per square inch (PSI). A standard garage compressor can produce up to that much pressure. While 150 PSI is the starting point of high pressure, Arctic Compressor typically supplies solutions for point of use pressures from 1000 – 6000 PSI.
For a typical car, use 1,200 to 1,900 PSI and 1.4 to 1.6 GPM for 1,900 to 2,800 cleaning units. Anything above risks the car's coating and paint.
Anything over 2,200 PSI should probably be avoided. As important if not more so than PSI is GPM (gallons per minute) You can have all the pressure in the world but it won't do much good without adequate water flow. Look for a machine that can flow 1.4 GPM or more, 2.0 to 2.4 GPM is widely considered the sweet spot.
Don't use household cleaning agents like hand soap, dishwashing detergent, or glass cleaner on the paint. These aren't formulated for use on a car's paint and may strip off the protective wax. Do use a dedicated car-wash product, which is milder and specifically designed for use on automotive paint.
Electric pressure washers are lighter, more nimble, and far quieter than their gas counterparts. And like all electric and battery-operated tools, they start instantly and are significantly better for the environment because they don't produce any emissions.
Apart from minor cleaning with the help of a clean and dry cloth regularly, you should properly get your car washed once every two weeks. This should be done to get rid of accumulated mud and dirt on the wheels, bumpers, inner wheel arches and mud flaps, as well as dust accumulated on windshields, door panels and roof.
For most people, the best pressure washer for detailing cars is going to be electric, produce around 1,000 PSI, and flow at least 1.2 GPM or more.
Selecting a pressure washer with a range of 2,000 psi to 4,000 psi will give you the most effective power for removing peeling paint. With pressure washers, as with all power equipment, always wear protective goggles and closed-toe shoes. Prepare the area around the structure you are working on.
For instance, if 35 psi is recommended, and the maximum safe pressure listed on your sidewall is 44 psi, you can safely put 38 or 40 psi in your tires. You can even go to 44 psi. You'll experience a harder ride, but you won't create a blowout danger. You may even experience sharper cornering and increased fuel economy.
Because of the high pressure levels, it can be very efficient and can drastically cut the time to complete this task. Selecting a pressure washer with a range of 2,000 PSI to 4,000 PSI will give you the most effective power for removing peeling paint.
When spraying clear coat I like to up the pressure 2-3 psi for a little more atomization and better flow out,HVLP spray gun Air Pressure Setting for Base Coat Clear Coat (High Volume Low Pressure) When spraying base coat clear coat systems, you want to spray at 26-29 PSI.
Too high of a PSI, washing from the bottom to top (instead of the other way around to clear off dirt and debris), or putting the stream of the pressure washer in one place for too long, can strip away or cause significant scratching and other damage to the paint.
Almost all modern car crushers use a hydraulic press to crush the cars. A large motor powers a pump that pushes hydraulic fluid to drive large cylinders. Using principles of force-multiplication, a hydraulic system can generate over 2,000 psi and impart more than 150 tons of crushing force onto a pile of scrap cars.
The highest barometric pressure ever recorded was 1083.8mb (32 in) at Agata, Siberia, Russia (alt. 262m or 862ft) on 31 December 1968. This pressure corresponds to being at an altitude of nearly 600 m (2,000 ft) below sea level!
Mid-Range Power: 2,000 to 3,200 PSI
The most versatile category of pressure washers, those ranging from 2,000 to 3,200 PSI effectively clean cars (including the most well-used off-road vehicles), home siding, fences, boats and grimy garage floors. Those closer to 3,200 PSI work effectively on tough stains, too.
Tire Damage and Wear
Plus, as a driver or passenger, you'll feel every bump and dip in the road, and that doesn't make for a pleasant ride. Excessive air pressure can also distort the shape of the tire, leading to decreased traction and increased wear and tear down the center of the tire.
PSI Pressure range for Different Surfaces
Different surfaces require different levels of PSI pressure. Generally, for most residential uses, an electric pressure washer (less than 2000 PSI) will suffice. Soft surfaces, such as decks and siding, usually require more cleaning power than harder surfaces such as driveways.