DIY: Eheim 2260 to 2262

[SunnyHouTX]

Cool. I got two 1260 sitting around

[aggrofishkeeper]

I own both the FX5 and Eheim and I have to say I'll stick to Eheim, I noticed the flow slowed down considerably on the FX5 after a year. And the pump being on the bottom is a no no for me.

[SunnyHouTX]

If only I knew this before I bought a 1262 a couple of months ago... FML

[eklikewhoa]

I wanna say this was discussed on here in the past.

[aggrofishkeeper]

I'm so lucky I bought a 2260 with the intake/out double tap quick disconnects. Those things are EXPENSIVEEEE for pieces of plastic.

[eklikewhoa]

Yeah they are, honestly the quick disconnects are what makes or breaks the deal when buying used.

I'm a gear snob and won't buy one unless it has them and that's where the price difference is when comparing the 2260/2262

[aggrofishkeeper]

Isn't it pretty simple to make your own Quick disconnects from pvc parts at Home Depot?

[eklikewhoa]

Yeah but those are bulky and not as nice.

The eheim has the valve block and the QD, the homemade QD are super bulky and then you would need a ball valve on both ends to compare to the eheim which would be even more bulky.

[sunkenmetal]

I'm so lucky I bought a 2260 with the intake/out double tap quick disconnects. Those things are EXPENSIVEEEE for pieces of plastic.

Yes but they are nice pieces of plastic...

[Totenkampf]

More flow = More impeller revolutions = More power consumption

It's a pretty simple concept, you gain approx the same in comparison to the increased power consumption

i dont believe this to be true EK, this isnt a mechanical coupling nor is it a positive displacement type pump where the pump moves all of the water that is caught in between the impellor vanes. they do not produce 'torque' if you will, that is why they are not rated for a head pressure like a fountain pump is. If you block in both sides of an impellor type canister filter the motor will still run the same magnetic field which is not dependant upon the impellors operation. the impellor is driven by a magnetic field which remains the same regardless of how fast the impellor is able to spin and i have obesrved that it still spins pretty fast. the field isnt variable so i dont see how the current draw could be different between the two. most likely the power consumption rating is just stupid marketing and inaccurate. if have a pretty full set of parts list for eheim pumps that i found while rebuilding my 2028 cansiter and i was surprised how many of the parts are the same. intel offers crippled cache or lower grade processors for the slower speeds and the higher bins are the top end cpus that get released later, but its the same part in many cases. eheim does the same with the flowrates it seems.

[Totenkampf]

okay i just caught an electrical engineer at the coffee machine so, since i am primarily a mechanical / hydraulics / pneumatics type guy, i wanted to make sure that i was thinking the right way. turns out i am not. a magnetically coupled impellor will still create more resistance in a magnetic field if the flow around its vanes are even slightly restricted. this resistance creates an inefficiency which will result in a greater load (eg current in amperage) to be drawn at the same voltage in order to accomplish the same work (eg power in watts). according to him the smaller rated filter that has the same motor and impellor assembly but has been purposely derated in its flow rate capacity by using a smaller orifice size (the volute) would actually require more power than the one that is more free flowing. so...hmmmm. i am going with stupid marketing data on eheims part. you would be surprised how many manufacturers will bs specifications in order to just have quantity to 'fill in the blank', even german ones

[SunnyHouTX]

I was thinking on the same lines Yeff, like the motor windings must be different between the 1260 and 1262, which makes more sense. On the other hand, the price differential between the two pumps is also under $20 at most places. I have a couple of 1260 pumps that I'm gonna swap impeller covers from one of my 1262 to see what happens when I clean out a 2262 this week.

I'm just kicking myself for buying a new 1262...

But then again, I now have two kickass sump pumps in my 1260s

[SunnyHouTX]

okay i just caught an electrical engineer at the coffee machine so, since i am primarily a mechanical / hydraulics / pneumatics type guy, i wanted to make sure that i was thinking the right way. turns out i am not. a magnetically coupled impellor will still create more resistance in a magnetic field if the flow around its vanes are even slightly restricted. this resistance creates an inefficiency which will result in a greater load (eg current in amperage) to be drawn at the same voltage in order to accomplish the same work (eg power in watts). according to him the smaller rated filter that has the same motor and impellor assembly but has been purposely derated in its flow rate capacity by using a smaller orifice size (the volute) would actually require more power than the one that is more free flowing. so...hmmmm. i am going with stupid marketing data on eheims part. you would be surprised how many manufacturers will bs specifications in order to just have quantity to 'fill in the blank', even german ones

You posted this as I was typing my previous post. Ask your engineer buddy if the motor windings should be different between the 1260 and 1262. Also if the restriction on the 1260 is removed, should power consumption change or stay the same when considering reduced restrictions and also higher RPM.

[Totenkampf]

he said that they might use a resistance coil (which would be like messing with the windings) in one motor versus the other but if they are both the same part number then eheim wont be doing that. germans are nuts about part numbers. our gas chromatographs have part numbers that routinely run about 80 characters.

looking at the exploded drawings, i would guess its just palting with numbers and now that i see how little free volume there is around the impellor (i was visualizing a different pump doh) i can see how the power draw would be different between the two

is it a pretty good pump otherwise? i have only ever used iwaki

[SunnyHouTX]

They are beast pumps for sure. I haven't used my 1260s yet but will change out my Quiet One and Rio pumps to these. I need to change the impeller cover on one of them to put under my 135gal tank.

So the the only difference being the cover is legit?