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Overheating - Water Pump 5 years 2 weeks ago #7233

  • Joachim
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Great ;)

I think i have some dismounted pumps somewhere in a box.
If i will find the time i will measure them.
So we will have a little sample of diameters.
Maybe this will help
I'm just wondering if the smaller pumps have the same shaft or not.
As far as i remember there are only differences in some diameters of the pump itself.
The inner parts are the same. I will check.

Time to open a list for a bulk buy ;)
Would it be helpfull to ask for other potential buyers?
I think the price depends on the amount of parts you will order .

ciao Joachim

Overheating - Water Pump 5 years 2 weeks ago #7234

  • ChrisB998
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Joachim,

Have been chatting with Zacpike and he is in need of some pump shafts. I will look at running a batch off on the CNC lathe at work for people.

These have to be machined, hardened and then ground between centres, because of the interference fit of the impeller and pulley; as such they wont be cheap, but the bigger the batch the better the price!

Overheating - Water Pump 5 years 2 weeks ago #7236

  • MikeW
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Joachim,

Have been chatting with Zacpike and he is in need of some pump shafts. I will look at running a batch off on the CNC lathe at work for people.

These have to be machined, hardened and then ground between centres, because of the interference fit of the impeller and pulley; as such they wont be cheap, but the bigger the batch the better the price!


I'm certainly interested.

Overheating - Water Pump 5 years 2 weeks ago #7237

  • Bison
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Me too.

Overheating - Water Pump 4 years 11 months ago #7272

  • PeMoPa
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Hello!

Short (or maybe not) statement to this topic. I build pumps since 2009, every year 30 pumps and so far i sold over 350 pumps worldwide. One pump of the first batch i put in a Gilera XRT engine, took them to Tunesia, Marokko, across the south of europe and the middle east. Do not know how many KM i did with it, but was a lot under the toughest conditions ;-)
Then i sold this bike to a german gileraclub-member, and few month ago he told me he is still happy with the engine....
But, to be honest, to build a waterpump sounds super easy but it is not.....

I found some comments about the pumps and i would like to give an answer.

I seem remember PEMOPA doing a curved vane, If everything else is

This is not working... i cancelled the idea with the curved vane because there was no progress at all.

#7181: The shaft of your PeMoPa pump looks, at least for me, like it has tumbeled around for a time

Are we seriously talking about a PeMoPa-Pump?

#7181: Usually the temperature is not that high to make C3 bearings needfull.
C3 is more expensive than bearings with normal play.

The past has showen (my opinion) that a C3 bearing is better than a standard. I found out (my opinion) that it does not belong to the temperature of the coolant system bc its a question of the rotations per minute. This generates a lot of heat and as higher the speed as higher the temperatur at the bearings.

#7183: Even if pemopa made the shaft diameter smaller to allow for expansion due to heat, in my opinion at 11.94 mm, it is too small.

I show you a detail of our drawing, we manufacture a diameter of 12 / 11.98 h7. For each single shaft we get a document with all the details of the pumps (diameter etc.) Thats a fact.

#7228 / 7229:

This will not work


Last word about the quality of PeMoPa-Pumps. Over the last 10 / 11 years i sold more than 350 pumps and so far we had roundabout 10 complains. Some of them were due to over tightened timing belts. Thats also a fact.
Nowadays everybody thiks he s a mechanik but for some of the clients its better to give jobs like changing a waterpump to a professional workshop.
If there was a complain in the past, we never cared about how or why, we tried our best to solve the problem.

Hope noone will get me wrong, just want to say my opinion.

Regards

Pete

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Overheating - Water Pump 4 years 11 months ago #7274

  • Joachim
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thanks for those informations

C3 bearings are not only used due to high temperatures.
Also the mounting condutions will have some influence (floating bearing, thrust bearing...)
I suppose Luigi has a good reason for C3 bearings.
They are more expensive and Luigi did use them anyway?
If they are not of any use, the Gilera controllers would have canceled this at once ;)
Also the idea to use a radial seal ring instead of a mechanical sealing.
If that will work Luigi (and his controllers) would have done this at once ;)
There must be a reason to use those expensive things.
Yust my opinion.
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