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Rockwells make your sac swell!
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<blockquote data-quote="patooyee" data-source="post: 451087" data-attributes="member: 483"><p>In hydraulic pumps pressure = power and displacement = speed.</p><p></p><p>Almost ALL PS pumps, stock or aftermarket, are in the 1200 - 1800 psi range. There is very little variance because beyond that the back plates blow off. Some people have experimented with billet back plates and then the retaining rings blow out or the housings crack. So at that point you're faced with designing a new housing and making a $1000 pump which no one is going to buy. This means that you're not really going to realize a large increase of power from a simple pump swap. You will if there is something wrong with the old pump that is preventing it from supplying full pressure. And maybe you will if you go from a 1200 psi pump to an 1800 psi pump. But most people are probably going from 1250 to about 1650 which isn't a huge gain. The biggest strength gain possibilities come from either reducing shaft size or increasing bore dia. of the ram. Force = pi * R^2 * pressure. That means the effect of increasing the radial surface area that the pressure acts on is exponential whereas increasing pressure alone is not.</p><p></p><p>Most aftermarket pumps will feature a small increase of pressure over stock but offer more in the form of displacement to increase speed. If you want to increase speed you have to fill the cylinder faster. To fill the cylinder faster you have to get a bigger orbital. To feed a bigger orbital you need more displacement from the pump.</p></blockquote><p></p>
[QUOTE="patooyee, post: 451087, member: 483"] In hydraulic pumps pressure = power and displacement = speed. Almost ALL PS pumps, stock or aftermarket, are in the 1200 - 1800 psi range. There is very little variance because beyond that the back plates blow off. Some people have experimented with billet back plates and then the retaining rings blow out or the housings crack. So at that point you're faced with designing a new housing and making a $1000 pump which no one is going to buy. This means that you're not really going to realize a large increase of power from a simple pump swap. You will if there is something wrong with the old pump that is preventing it from supplying full pressure. And maybe you will if you go from a 1200 psi pump to an 1800 psi pump. But most people are probably going from 1250 to about 1650 which isn't a huge gain. The biggest strength gain possibilities come from either reducing shaft size or increasing bore dia. of the ram. Force = pi * R^2 * pressure. That means the effect of increasing the radial surface area that the pressure acts on is exponential whereas increasing pressure alone is not. Most aftermarket pumps will feature a small increase of pressure over stock but offer more in the form of displacement to increase speed. If you want to increase speed you have to fill the cylinder faster. To fill the cylinder faster you have to get a bigger orbital. To feed a bigger orbital you need more displacement from the pump. [/QUOTE]
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