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#1
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Power/pressure washers: GPM & PSI - are they accurate, what is moreimportant
I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). |
#2
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
In article , Some Guy wrote:
Your answer should not include "it depends on what you want to wash". It depends on what you want to wash. |
#3
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). The second is 4 times better. Anything can give you pressure. Even your grease gun can give you 10,000psi. The GPM rating far outweighs the pressure rating. |
#4
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Power/pressure washers: GPM & PSI - are they accurate, whatis more important
Some Guy wrote:
I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). IMHO - If you focus the stream, the pressure indicates how intense that stream will be. The GPM indicates how large an area you can clean per swath at a particular pressure. So if your concern is cutting through tough dirt in small areas, the pressure might be more interesting. If your concern is covering large areas in a reasonable time, the GPM might be what you want to look at. |
#5
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
cjt wrote:
Some Guy wrote: -snip- Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). IMHO - If you focus the stream, the pressure indicates how intense that stream will be. The GPM indicates how large an area you can clean per swath at a particular pressure. So if your concern is cutting through tough dirt in small areas, the pressure might be more interesting. If your concern is covering large areas in a reasonable time, the GPM might be what you want to look at. In other words. . . . "It depends on what you want to wash".g Jim |
#6
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
On Jul 11, 9:25*pm, Some Guy wrote:
I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). What are you washing |
#7
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Power/pressure washers: GPM & PSI - are they accurate, what is moreimportant
ransley wrote:
What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? I think that is the more relavent question here. What are you washing Today it might be one thing. Tommorrow it might be something else. Next year something completely different. Now do you see why asking "what do you want to wash" is irrelavent? If I wanted to buy a set of wrenches, or a drill, would you be asking "what want to assemble / disassemble?" or "what do you want to drill?". |
#8
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
Some Guy wrote:
ransley wrote: What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? I think that is the more relavent question here. What are you washing Today it might be one thing. Tommorrow it might be something else. Next year something completely different. Now do you see why asking "what do you want to wash" is irrelavent? If it was irrelevant why would you even need to ask? If I wanted to buy a set of wrenches, or a drill, would you be asking "what want to assemble / disassemble?" or "what do you want to drill?". In the case of a drill are you hanging curtains or using it in your steel erection business? Maybe a crappy harbor freight $9 drill will be OK for the curtains. |
#9
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Power/pressure washers: GPM & PSI - are they accurate, what ismoreimportant
George wrote:
What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? I think that is the more relavent question here. Still not willing to answer that question eh? Now do you see why asking "what do you want to wash" is irrelavent? If it was irrelevant why would you even need to ask? Ask what? I'm not the one asking "what do you want to wash?". I'm the one saying "don't ask me that question". How about this. I want to use it to wash my windows one day and carve granite statuary another day. Does that help? I'm asking if the GPM and PSI numbers (and engine HP numbers) can be trusted from one make/model to the next. I'm asking what are the minimum GPM, PSI and engine HP numbers that make it worth while to buy and use these things. If I wanted to buy a set of wrenches, or a drill, would you be asking "what want to assemble / disassemble?" or "what do you want to drill?". In the case of a drill are you hanging curtains or using it in your steel erection business? Don't you think that if I had a "steel erection business" that I'd probably have periodic contact with sales consultants for products that you will never see in a Lowes or Home Depot and I would probably already have several industrial-grade drills for us in my business? Do you have to resort to that level of hyperbole to make an inconsequential point? If you have no actual experience owning / using a pressure washer, then don't waste my time. |
#10
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
On Sat, 11 Jul 2009 22:25:19 -0400, Some Guy wrote:
I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? Yes, expect a lot of fudging. What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? It depends greatly on the type of work and the quantity of it. The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". Sorry but what you want to wash is a critical part of the choice. A large sledge hammer is good for splitting logs, but it is not very good at cutting diamonds. I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). Depends. Some things clean up best with more volume and less pressure and others with more pressure and less volume. In both cases it generally is faster - better with more volume and pressure. |
#11
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
On Jul 11, 9:25*pm, Some Guy wrote:
I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). From a homeowners useage point of view you will 'never' need more than 2500psi, however you will often wish you had more than 2 GPM. With 2500psi you can easily carve your initials in your wooden deck, remove paint from your car, and blow window panes out of their mountings. KC |
#12
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
Some Guy wrote:
How about this. I want to use it to wash my windows one day and carve granite statuary another day. Does that help? You don't use a pressure washer to wash windows. You use a brush on a stick and a hose or a bucket and a rag. You might even consider a sponge and a squeegee. I will leave the topic of window cleaning solutions for another discussion. Jon |
#13
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
On Jul 12, 7:15*am, Some Guy wrote:
ransley wrote: What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? I think that is the more relavent question here. What are you washing Today it might be one thing. Tommorrow it might be something else. *Next year something completely different. Now do you see why asking "what do you want to wash" is irrelavent? If I wanted to buy a set of wrenches, or a drill, would you be asking "what want to assemble / disassemble?" or "what do you want to drill?". You dont get it, its all about what you wash, if its a 10ft side walk, or a lawnmower its one need, if its a mud caked dump truck or a 500ft building its another. Ive used the best units and the least powerfull, sizing a tool is whats important like I dont use my 1/2 " hammer drill to drill a 1/16" hole, but maybe you do. On that note id rather have more gpm than pressure for my minimal needs |
#14
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Power/pressure washers: GPM & PSI - are they accurate, whatis more important
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#15
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Power/pressure washers: GPM & PSI - are they accurate, what is moreimportant
Some Guy wrote: I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). They are independent. PSI = Cleaning power as it dictates the water velocity and thus cleaning force. GPM = Cleaning efficiency as it dictates the volume of high pressure water and therefore the area that the cleaning force can be applied to. The smaller the area, the longer it will take to clean a given surface area, just like a 22" lawn mower vs. a 60". |
#16
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Power/pressure washers: GPM & PSI - are they accurate, whatis more important
Pete C. wrote:
Some Guy wrote: I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). They are independent. PSI = Cleaning power as it dictates the water velocity and thus cleaning force. GPM = Cleaning efficiency as it dictates the volume of high pressure water and therefore the area that the cleaning force can be applied to. The smaller the area, the longer it will take to clean a given surface area, just like a 22" lawn mower vs. a 60". Well, that ain't exactly the whole story either... The nozzle tip geometry has a great deal to do w/ the actual application of the water to the surface and the effect thereon for whatever the actual PSI/GPM ratings are... -- |
#17
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
On Jul 11, 9:25 pm, Some Guy wrote: I'm looking at a few gasoline-powered pressure washers. What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). The numbers are real, but they are also somewhat meaningless other than rough comparison. While you don't want to hear "it depends", in actual use, it does. The rating figure is for the water coming out of the tip at close range. In actual use, the 2000 psi unit held at a food or two is giving the same pressure at the 4000 psi unit held a longer distance, and the object of being cleaned in receiving far less than the rated numbers. My experience is limited to a 2500 psi model and I've never wanted more, either at home or at the shop. OTOH, if I wad dong heavy cleaning of power plants every day, I'd go with bigger. |
#18
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Power/pressure washers: GPM & PSI - are they accurate, what is moreimportant
ransley wrote:
I've used the best units and the least powerfull, sizing a tool is whats important like I dont use my 1/2 " hammer drill to drill a 1/16" hole, but maybe you do. On that note id rather have more gpm than pressure for my minimal needs I can understand that if I'm washing something tough/nasty all day long because it's my job, that I don't necessarily want the smallest nozzle and spend a lot of time cleaning one spot because it's all my machine is capable of. There must be some minimum amount of PSI/GPM rating to make these things worth buying for home or light commercial use. And nobody has yet to comment on the power rating of the engine. Since the engine is the real power behind these washers, how can it be explained that there is such a wide range of power (from 5 hp to 15 hp) yet the PSI and GPM numbers don't change very much, and sometimes two different washers with identical GPM/PSI rating will have vastly different engine HP rating. I'm also looking at a sand pickup attachment (for wet sandblasting) that claims to have a minimum requirement of 3 gpm @ 1500 psi. http://www.princessauto.com/vmchk/sh...-sandblast-kit |
#19
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Power/pressure washers: GPM & PSI - are they accurate, whatis moreimportant
dpb wrote: Pete C. wrote: Some Guy wrote: I'm looking at a few gasoline-powered pressure washers. Naturally, the typical specs a a) the hp rating of the engine b) the gpm c) the psi So my main question is - are these numbers fudged, or have a wide accuracy range? What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). They are independent. PSI = Cleaning power as it dictates the water velocity and thus cleaning force. GPM = Cleaning efficiency as it dictates the volume of high pressure water and therefore the area that the cleaning force can be applied to. The smaller the area, the longer it will take to clean a given surface area, just like a 22" lawn mower vs. a 60". Well, that ain't exactly the whole story either... The nozzle tip geometry has a great deal to do w/ the actual application of the water to the surface and the effect thereon for whatever the actual PSI/GPM ratings are... Yes, but most any given pressure washer can accept different nozzles, the max PSI and GPM available to drive the nozzle don't change. |
#20
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Power/pressure washers: GPM & PSI - are they accurate, what is moreimportant
Ed Pawlowski wrote: On Jul 11, 9:25 pm, Some Guy wrote: I'm looking at a few gasoline-powered pressure washers. What is the minumum rating (in terms of gpm and /or psi) that make it worth while to actually buy one of these things? The range I see are from 2 to 4 GPM, and roughly 2000 to 4000 psi. Engine HP from 6 to 13. Your answer should not include "it depends on what you want to wash". I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). The numbers are real, but they are also somewhat meaningless other than rough comparison. While you don't want to hear "it depends", in actual use, it does. The rating figure is for the water coming out of the tip at close range. In actual use, the 2000 psi unit held at a food or two is giving the same pressure at the 4000 psi unit held a longer distance, and the object of being cleaned in receiving far less than the rated numbers. Pressure is in the hoses and lines up to the nozzle, there is no pressure after the nozzle, only velocity. |
#21
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
On Jul 12, 10:47*am, Some Guy wrote:
ransley wrote: I've used the best units and the least powerfull, sizing a tool is whats important like I dont use my 1/2 " hammer drill to drill a *1/16" hole, but maybe you do. On that note id rather have more gpm than pressure for my minimal needs I can understand that if I'm washing something tough/nasty all day long because it's my job, that I don't necessarily want the smallest nozzle and spend a lot of time cleaning one spot because it's all my machine is capable of. There must be some minimum amount of PSI/GPM rating to make these things worth buying for home or light commercial use. * And nobody has yet to comment on the power rating of the engine. Since the engine is the real power behind these washers, how can it be explained that there is such a wide range of power (from 5 hp to 15 hp) yet the PSI and GPM numbers don't change very much, and sometimes two different washers with identical GPM/PSI rating will have vastly different engine HP rating. I'm also looking at a sand pickup attachment (for wet sandblasting) that claims to have a minimum requirement of 3 gpm @ 1500 psi. http://www.princessauto.com/vmchk/sh...washer-accesso... For light use my electric karcher is fine, its maybe 2 gpm at 1300 psi, a 13hp commercial unit may accept 6 gpm or more so it has the extra power but my supplys are under 5gpm, sometimes 3gpm. Measure your faucet gpm because buying more is a waste of money. For ocasional use a 15 or 30a electric might be smarter, there are electrics that use 3-5 gpm. Doing windows and carving granite are not what you get a power washer for. So the questions of its use, are what determine what is best, ive used the bigest Honda, I dont want one, it would be overkill for me. |
#22
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
"Pete C." wrote in message Pressure is in the hoses and lines up to the nozzle, there is no pressure after the nozzle, only velocity. So when the water hits the surface, there is no pressure against it? You can hold your hand against it and feel nothing? Velocity is the rate of change of position, pressure is what you feel. |
#23
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Power/pressure washers: GPM & PSI - are they accurate, what is moreimportant
Ed Pawlowski wrote: "Pete C." wrote in message Pressure is in the hoses and lines up to the nozzle, there is no pressure after the nozzle, only velocity. So when the water hits the surface, there is no pressure against it? You can hold your hand against it and feel nothing? Velocity is the rate of change of position, pressure is what you feel. There is force from the mass of the water impacting the surface at a high velocity, but this is not the same as the fluid pressure inside the hose. |
#24
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
"Pete C." wrote in message ster.com... Ed Pawlowski wrote: "Pete C." wrote in message Pressure is in the hoses and lines up to the nozzle, there is no pressure after the nozzle, only velocity. So when the water hits the surface, there is no pressure against it? You can hold your hand against it and feel nothing? Velocity is the rate of change of position, pressure is what you feel. There is force from the mass of the water impacting the surface at a high velocity, but this is not the same as the fluid pressure inside the hose. True, but that force, or pressure is what counts, not the pressure inside the hose. As you move the nozzle closer and farther from the target, the force is going to change. Even though the figure is given in psi, the hole in the nozzle is very small too, not an inch. Just as light falls off as you move to increase the distance between the light source and target. |
#25
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
On Sun, 12 Jul 2009 09:09:11 -0400, Some Guy wrote:
.... How about this. I want to use it to wash my windows one day and carve granite statuary another day. Does that help? I hope you are not planning to use the same tools for both. I'm asking if the GPM and PSI numbers (and engine HP numbers) can be trusted from one make/model to the next. Not very. They both likely will have inflated their numbers. This kind of misrepresentation is most common on consumer grade tools than professional or industrial. I'm asking what are the minimum GPM, PSI and engine HP numbers that make it worth while to buy and use these things. It depends on what you want to use it on. I would go a little further and suggest that not only what you want to use it on but also what make and model tool, not just the GPM and PSI. Sort of like asking what the Towing capacity and the fuel tank capacity is needed for for a car and not telling us what you want to do with that car. We might guess you want to tow a boat, but that could be a 40 foot power boat or a 10 foot row boat. Would you tell you doctor you have a pain, and you want to know what to do about it and refuse to tell him where the pain is, or when you feel it? |
#26
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Power/pressure washers: GPM & PSI - are they accurate, what ismoreimportant
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#27
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
In article , Some Guy wrote:
Can you cite any authoritative source that has done any sort of analysis of several models of home, farm or light-commercial grade power washers and has come to that conclusion or made that observation? My problem with your queries is that you're asking for a hell of a lot more information than any one person is likely to have. Few people own more than one pressure washer, or have owned more than a couple of them in their lives. And almost none of them have ever verified the accuracy of the stated GPM or HP. I think the best you're going to get out of a bunch of random idiots (and I mean that in a polite way) is anecdotal stuff such as: "I used to own an ABC model 17 washer, with specs "such and such," and I used it to do tasks X, Y, and Z. It was OK for X, fair for Y, and useless for Z. Last year I bought a DEF model 99, with specs "this and that," and it is more than I need for X, works well on Y, and is acceptable but slow for Z." If you get enough of those tales, you're going to have to tabulate and analyze the results yourself. But I doubt you're going to get much statistical significance out of a small group like a.h.r. No one here is going to do a major research project for you, only contribute small bits to your own research project. Maybe you can approach CR, and tell them you'd like to write a piece on the topic, and ask them for $20,000 to buy the washers, $10,000 to do the research, and $10,000 to write the article. Having said all that, I'd say spend the most you can afford on name brand equipment, and limit yourself to tasks it will perform, as determined by your own experience. I know many here are happy with their units, but I've never seen the need for a home owner quality, 120 VAC washer. I've got a very good brass hose nozzle, no moving parts, and it's capable of doing everything I need done. If I ever need something more serious done, I'll hire a guy with a professional unit on a trailer, powered by an actual internal combustion engine. |
#28
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Power/pressure washers: GPM & PSI - are they accurate, what is more important
I want to know if a washer that does 2 gpm @ 2000 psi has only half the "cleaning power" as one that can do 4 gpm at 4000 psi (ie does the cleaning power scale linearly with these numbers, or geometrically or exponentially). Another way of looking at these two washers is to make a more common electrical comparison. This comparison difference will hold true in pressure washers also. 2gpm @2000 psi would be represented by 2amps @2000 volts 4gpm @4000 psi would be represented by 4 amps @4000 volts Power = Voltage x Amperage So........ The 2gpm washer equals 4000 units of cleaning power The 4gpm washer equals 16000 units of cleaning power * units of cleaning power undefined * units of cleaning power are for reference/comparison only |
#29
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Power/pressure washers: GPM & PSI - are they accurate, what ismore important
On Mon, 13 Jul 2009 08:44:27 -0400, Some Guy wrote:
wrote: I'm asking if the GPM and PSI numbers (and engine HP numbers) can be trusted from one make/model to the next. Not very. They both likely will have inflated their numbers. This kind of misrepresentation is most common on consumer grade tools than professional or industrial. Can you cite any authoritative source that has done any sort of analysis of several models of home, farm or light-commercial grade power washers and has come to that conclusion or made that observation? ... I have seen some test results, but nothing conclusive. I would expect that the numbers are real and under the specific text conditions, they are valid. The problem is each manufacturer, or even different models may be measured using different methods. Do you own or use any power washers? ... Yes If I describe exactly what I want to clean, can YOU tell me the minimum PSI and GPM I need? No. I would need to have more detailed information about the equipment on the market, which I have never seen, and there would be the difference in what I would consider minimum and what you would consider minimum. If time is no issue, then why use a power washer at all. a standard hose will do the job. It may take weeks, but that 30 psi will do it in time. Or do you just like answering a question with another question? I love answering questions with a question when the initial question needs clarification. |
#30
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Power/pressure washers: GPM & PSI - are they accurate, whatismore important
I just aquired a 1800psi 2 gpm with a B&S 4.5HP. It will peal paint. I
was using a 1300 PSI electric that I thought was pretty good. For the typical non-professional consumer (like me), the 1800/2GPM will do most of what you want to do. If it is too powerful, hold the tip farther fromt he surface to be cleaned. Also, there are an array of tips that can be bought that will fit most jobs. Or, get an adjustable one. Hank ~~~keeping it simple |
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