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Low flow rate MCP655?

post #1 of 13
Thread Starter 

Hey guys,
I think my pump is giving me incredibly low flow rates. Im not sure what these pumps are usually capable of, but both of the pumps i got act like this.

These are the MCP655's with the adjustable speeds. I took a video of them in action. It starts on full speed then goes down to the lowest, then back up.


Any help would be appreciated.

Thanks OCN
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post #2 of 13
Looks like a kink in the line at the top of the pump, in that video. They're rated at a maximum discharge rate of ~ 317 GPH (1200 LPH). Are the pumps new?
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post #3 of 13
Thread Starter 
Yeah the pumps are brand new from sidewinder.
And i know it looks like a kink at the top, but its not really kinked at all. Just stretched over the top of the pump. It looks like this no matter if i hold all the line in my hand to make sure there is no bends at all.

So does this look slow to you?
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post #4 of 13
If the pumps sound smooth while running and they are both doing the same thing, then they are good.
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post #5 of 13
Thread Starter 
This doesnt even flow fast enough to push air bubbles out from the output. Ive seen videos of these pumps making whirlpools in the res. This isnt nearly that powerful.

This doesn't seem a little weird to you? How fast do your pumps flow?
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post #6 of 13
That looks normal. When it's a closed system, there's less water resistance than trying to pull water out of a sink.
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post #7 of 13
The tubing in this video is smaller than yours and looks to be flowing faster, but it's the same amount of GPH (LPH).
http://www.dailymotion.com/video/xa7...osition-5_tech
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post #8 of 13
Thread Starter 
Ok, thanks a lot. was looking for a video forever.

Didn't realize these pumps were so weak. +rep
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post #9 of 13
Quote:
Originally Posted by OverShocked View Post
Ok, thanks a lot. was looking for a video forever.

Didn't realize these pumps were so weak.
They do a lot better with a little bit of pressure at inlet. Centripetal pumps are not great at sucking, they are meant to push the water. When you set your loop up, try to mount the res higher than the pump. This will help the performance and also make it easier to bleed the loop.
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post #10 of 13
Quote:
Originally Posted by GingerJohn View Post
They do a lot better with a little bit of pressure at inlet. Centripetal pumps are not great at sucking, they are meant to push the water. When you set your loop up, try to mount the res higher than the pump. This will help the performance and also make it easier to bleed the loop.
This. I use 2 of these and they do push water very well. If they were weak and didn't work well why would so many people buy them?
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