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bigben2k · 05-19-2002, 11:16 AM

This has to be the worse thread I have ever seen...

1-running a 900GPH pump is not better, in fact, it's more likely to be worse, far worse...

1A- You will put a tremendous pressure in your system, and you'll be running like a headless chicken plugging leaks everywhere.

1B- There is too much flow resistance for your pump to operate at maximum capacity, and it will most certainly overheat.

2- A faster flow rate does not mean that you will get better cooling, in fact (as UnaClocker will testify) it might run worse.

The coolant needs to be in the radiator for some time, in order for it to transmit its heat out of it.

So any way you look at it, it's a bad idea. That being said...

3- You can try to undervolt a pump, but it may not work. A dimmer will not work, it is only designed to clip the top of an AC sinewave, which works very well for light bulbs, but very poorly for variable load items, like a pump. (i.e. the pump draws lots more current at the top of the sine wave). I've used a dimmer on an AC motor before (a small fan) and it works, but you can tell just from the noise it makes, that it's already struggling...

3A- Some pumps, mostly industrial types, are designed to run at the top of their specified voltage range. Running under that voltage may have a number of unpredictable results, up to, and including, the pump not moving any water whatsoever.

The easiest way to drop the voltage, would be to slap a big resistor between the AC outlet and the pump. The problem is that it would have to be rated for at least 250W, and I can tell you right now, you're not likely to find one, never mind being able to fit it anywhere...

So if you really want to try it, then go right ahead: we're all waiting anxiously to see the results...

05-19-2002, 11:16 AM	#21
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	This has to be the worse thread I have ever seen... 1-running a 900GPH pump is not better, in fact, it's more likely to be worse, far worse... 1A- You will put a tremendous pressure in your system, and you'll be running like a headless chicken plugging leaks everywhere. 1B- There is too much flow resistance for your pump to operate at maximum capacity, and it will most certainly overheat. 2- A faster flow rate does not mean that you will get better cooling, in fact (as UnaClocker will testify) it might run worse. The coolant needs to be in the radiator for some time, in order for it to transmit its heat out of it. So any way you look at it, it's a bad idea. That being said... 3- You can try to undervolt a pump, but it may not work. A dimmer will not work, it is only designed to clip the top of an AC sinewave, which works very well for light bulbs, but very poorly for variable load items, like a pump. (i.e. the pump draws lots more current at the top of the sine wave). I've used a dimmer on an AC motor before (a small fan) and it works, but you can tell just from the noise it makes, that it's already struggling... 3A- Some pumps, mostly industrial types, are designed to run at the top of their specified voltage range. Running under that voltage may have a number of unpredictable results, up to, and including, the pump not moving any water whatsoever. The easiest way to drop the voltage, would be to slap a big resistor between the AC outlet and the pump. The problem is that it would have to be rated for at least 250W, and I can tell you right now, you're not likely to find one, never mind being able to fit it anywhere... So if you really want to try it, then go right ahead: we're all waiting anxiously to see the results... __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101 Last edited by bigben2k; 05-19-2002 at 11:47 AM.