Q:When the pump is running with frequency conversion, the instantaneous power is greater than the power frequency operation, and the actual flow and lift are less than the power frequency. When running, the efficiency is very low. Why?

Pump power frequency operation, speed is rated. Frequency conversion actually adjusts the speed of the pump (the speed becomes smaller), and the flow of the pump moves parallel and downward. As for efficiency, it depends on the operating conditions of the pump. Does it deviate or run to the minimum efficiency position of the flow curve of the pump?.

Q:Does the IP55 indicate the lift on the water pump nameplate?

IP55 refers to the level of protection

Q:I have a 1969 Chrysler with a new 3 core radiator. It still has the stock water pump and I am wondering if a high volume pump would make it run cooler at higher speeds. It runs hotter when you get off the freeway. I have flushed the system and installed a new thermostat. I also replaced the fan clutch. I am at a loss of why it still runs warmer than the 180* thermostat.

maybe the fan is too far away from the radiator to efficiency pull the air at slow speed. They sell spacers.

Q:ok so i have a crack in my radiator a small crack but anyways yesterday it caused my car to over heat. i normally keep coolant in the car but it just got low and over heated pretty bad. so today the car is making a really loud annoying noise. coolant is also draining out of the bottom of the engine when the car is on. at a pretty good pace. it is coming out like right under the belt area so my friend said it is probably the water pump baring and he said it could have gotten damaged when it over heated. so i think these symptoms def point to the water pump. anyways i called a mechanic and he said that he had to change the belt to and he said he had to charge me $385. what you guys think. does he need to change the pump and the belt or just the pump? and is $385 a rip off or is that the going rate? thank you all for your knowledgeand information

That water pump is driven by the timing belt. Usually when you do a timing belt or water pump it makes sense to change both now because they are both difficult to get to and you have to take off the same things for both. $385 is a bad price If you want to look smart about it, ask him to look at and check the seals, all he would be able to tell you is if they are leaking, if they are, ask him how much more. It's all worth it if the car is still good. We just did that on a friend's '91 and her's overheated a few times. She ha 235,000 miles.

Q:do you trust the bran?

Point blank, ask the folks at Auto Zone where this water-pump was produced. If it was re-manufactured off-shore leave it on their shelves. I trust you knew these Duralast water-pumps are re-manufactured. All AC-Delco starters, alternators and water-pumps are re-manufactured in the USA. Every part inside the reused housings are factory brand new with parts made here in the US.

Q:I replaced the water pump on my 350 chevy small block and the thing is leaking out of the lower bolt hole on the passenger side. I was told to remove the bolt and coat it with permatex hi tack gasket sealer and reinstall it. Any how I'm wondering why there would be a leak there in the first place, any ideas?

my first response is, you used a wrong gasket or you mucked up the gasket when you installed it. Then i think of maybe the water pump casting cracked when you tightened the bolt. ( but not likely) . I guess you could try the sealer thing. but you could test it to see if it leaking from under the bolt head. The way you could do that is put a soft washer , like copper washer under the bolt head and put the bolt back in. the soft copper washer will make a water tight seal. if it were me , i would remove the pump and find out what the hay is wrong . i have replaced at least 6 water pumps on my own chevys, and have never had that problem.

Q:I Need a water pump, no matter its fountain pump or high stream pump. But the things or you can say the parameters i required in that pump is, 2 inch minimum outlet from where the water come out, pressure 130 or above (in PSI) runs wid a 1 or 2 Horse Powered motor not more then 2HP. And the pressure calculation is flow of the water (130 Psi) , like while water is streaming out.Any one who can sugest some water pumps which can fulfill or near or above to my requirements. thanks alot sir for you kind time.

With 100M of 'head' you're going to need a constant displacement pump, and high pressure piping. I'd consider an intermediate lift station.

Q:In this area (picture) its leaking quite a bit of coolant underneath the car it is heavy dripping. Could it be the water pump? Car is over heating .It almost looks like its missing a screw or something where the coolant is dripping.

Looks like it needs a thorough coolant flush and a water pump.

Q:the car over heats and I hear the antifreeze boiling and it also leaks a small amount of antifreeze amechanic told me i need a thermostat and a new water pump just looking for second opinion.

Most likely thermostat is stuck closed, However if your waterpump isn't turning, it would cause the same problem. Does the air in the car get hot when you have the heater on full blast?

Q:my 98 expedition keeps over heating, i replaced the water pump, thermostat,coolant. it will be fine one minute then it overheats. weather im on the road or sitting at a light. i also replaced the fan clutch. thanks!

I would check the radiator first and if its not it then your looking at a bad head or head gasket if u have already replaced what u said u have