Second water pump gone already

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Mcv4 said:
Thinking about it, if your bike was out of warranty and you were also paying labour to have the pump replaced on the regular, it may not look like too bad of a proposition
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Looks like a pump from a swamp cooler. $50. $1000 is a pretty silly price for a pump and a couple of hoses. Looks like a DIY project. Ultimately running a pump from the alternator is a power losing proposition. They're no such thing as perfect energy transfer and if the pump is constant velocity it will draw more power when it's not needed. Of course, on these you'd never notice any minor power loss.
 
BP PanigaleV4S said:
:rolleyes:
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The pump has to be sized to provide enough flow to cool at max power. An electric pump can be run at that output constantly, don't need speed variance. On drag race cars pretty common except you're not running the pump from the alternator as you don't have one. It would appear from the pictures they're providing speed variance. I can see this as being readily done by taking a signal off the crank sensor and building a small circuit that would convert this to a linear output controlling a power transistor that varied current to the pump. The speed variance is trick but unnecessary if you're willing to give up a little power.
 
Ready to collect 😂
 

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It might get kind of hot down there. I used an aluminum bottle and zip tied it to the fan bracket.
 
Mcv4 said:
Modified. Hopefully get some time to give it a hiding soon.
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Why don't you just add a nipple and plumb it into the overflow tank. The overflow tank only sees pressure when the caps off its seat. Then if unseated it would want to pressurize the line you added but wouldn't that only end up as a push at the back of the seal. Maybe a one-way valve in the line? The seal on the bleed end of the bearing assembly activates by pressure in the bleed cavity. I'm going to think about this some more. Thoughts?
 
If it was weeping badly, I'd do something like that but as I / the dealer can't get it to weep under normal riding this will work better for the sake of the exercise due to gravity. It's only a small amount of coolant and I only want to catch some so I can show the dealer and have proof (other than pics and video that didn't do the job). The bottle is vented on the lid so coolant should run down the line and collect in the small bottle with ease.
 
Mcv4 said:
If it was weeping badly, I'd do something like that but as I / the dealer can't get it to weep under normal riding this will work better for the sake of the exercise due to gravity. It's only a small amount of coolant and I only want to catch some so I can show the dealer and have proof (other than pics and video that didn't do the job). The bottle is vented on the lid so coolant should run down the line and collect in the small bottle with ease.
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Makes sense. Yours is a weird failure anyway.
 
Managed to get out for a solid ride on the weekend with the collection bottle. Initially no visible coolant collected in the bottle while relatively 'normal' riding. The area I wanted to try and replicate the the type riding I was doing where the last 2 water pump failures occurred is mid way into this 370 odd km loop and is a series of tighter corners where you can use a lot of on/off 1st gear continuously for about 16km (it's actually called 10 mile corners). After this section, and a lot of corner exit wheelies + TC intervention I pulled over to see approx 15mL of coolant in the bottle. It seemed that after this no matter how I was riding, the coolant kept weeping from the pump. By the time I got home there was approx 50mL of coolant in the bottle.

Drained it, took the bike for a local cruise to get breakfast the next day and once again, zero coolant in the bottle.

From this test, on my bike anyway, it seems that I can reasonably conclude that this particular water pump needs heat and high RPM 1st gear usage to start the weep process off. Once it starts it doesn't seem to stop until it's cooled down again. My first failed pump happened under the same conditions but didn't stop and got bad fast.

Hopefully this is enough of a test for Ducati to replace the pump.
 

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Mcv4 said:
Managed to get out for a solid ride on the weekend with the collection bottle. Initially no visible coolant collected in the bottle while relatively 'normal' riding. The area I wanted to try and replicate the the type riding I was doing where the last 2 water pump failures occurred is mid way into this 370 odd km loop and is a series of tighter corners where you can use a lot of on/off 1st gear continuously for about 16km (it's actually called 10 mile corners). After this section, and a lot of corner exit wheelies + TC intervention I pulled over to see approx 15mL of coolant in the bottle. It seemed that after this no matter how I was riding, the coolant kept weeping from the pump. By the time I got home there was approx 50mL of coolant in the bottle.

Drained it, took the bike for a local cruise to get breakfast the next day and once again, zero coolant in the bottle.

From this test, on my bike anyway, it seems that I can reasonably conclude that this particular water pump needs heat and high RPM 1st gear usage to start the weep process off. Once it starts it doesn't seem to stop until it's cooled down again. My first failed pump happened under the same conditions but didn't stop and got bad fast.

Hopefully this is enough of a test for Ducati to replace the pump.
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See if you can keep that pump. Their QC guys don't need it. They should have plenty of pump failure data.
 

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