Pressure Washer, advice needed!

Soldato
Joined
18 Oct 2002
Posts
9,804
Location
Southampton, Hampshire
Having had the unfortunate pleasure of washing my car on the weekend due to the serious lack of water pressure of the hose ive decided to invest in a pressure washer.

"aaaah you'll strip the paint off the car!!1" i hear you cry but as long as its set to a low bar it should be safe... plus its a new car and there arent any rust spots to flake off anyway!

right, from all my searching and knowledge gathering ive decided to go for a low power, induction motor (it'll be quiet too, so no need for ear protectors!) and one that can pump out enough water to do a cleaning job justice.

something i dont understand is how is a pressure washer able to generate the pressure if there is low pressure in the first place? incoming is slower than the outgoing therefore wouldnt it just run out of water to pump though? im guessing there has to be some sort of large resevoir in order to compensate?

the one i have my eye on is the Karcher 499M. Does anyone own one of these? Opinions? :)
 
kaiowas said:
Flow rate and pressure are different (but connected) things.

For a given (volume) flow rate through a nozzle you can increase pressure by reducing the nozzle size - or in simple terms, squashing the end of a hosepipe makes the water come out faster.


yes but... when the flow rate is a trickle, theres only so much pressure you can generate from it, before closing off the end (i.e. becomes too small) right?
 
the cheapest ive found the K499 M above is £129.97... i dont really want to pay a lot as the most it'll be used for is washing cars and maybe the patio. can they be used with say a sand blaster attachment?
 
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