Electric water pump

quote:

Originally posted by ItalFord:
I read a long time ago that Edelbrock dyno's their water pumps. I wonder if someone can contact them and ask if they can share that data?

I can't believe that water pump flow/head/rpm curves are not readily available. extensive googling today only found the following link where one did call edelbrock and obtained data for thier pump
http://www.clubcobra.com/forum...-specifications.html

I wish they had at least included the head drop across the heads they used during thier flow testing

reading between the lines answered one question for me...I have seen where "NASCAR" water pump flow rates are +100 gpm, the comment in the post was this is due to NASCAR intentionally restricting AIR flow through the radiator, thus the need for greater water flow

quote:

Originally posted by PanteraTurbo:
Just out of curiosity has anyone ever measured the head pressure in a pantera with a known pump?

another "I can't believe"! IF I had been interested in Panteras during the period when I was capable, I would have had to measure this, especially given the redoric I've seen recently about the inadaquancies of the original cooling system

even though the flow rates do approach 100 gpm at high rpms, I would wonder how much flow was truelly needed and would be concern that "overheating" could occur with those expected flows due to actual flow being less due to cavatation influanced by actual system head lossed

quote:

Originally posted by JFB #05177:


another "I can't believe"! IF I had been interested in Panteras during the period when I was capable, I would have had to measure this, especially given the redoric I've seen recently about the inadaquancies of the original cooling system

even though the flow rates do approach 100 gpm at high rpms, I would wonder how much flow was truelly needed and would be concern that "overheating" could occur with those expected flows due to actual flow being less due to cavatation influanced by actual system head lossed

We have the technology!!! I will weld in some bungs to the water pipes when I do my new setup. Its quite easy for me to measure as I have plenty of fluid sensors kicking around and an ECU that can read the differential. Wont happen for a few months anyway.

at the rate I'm going, a few months will be well before I could!

getting temperture and pressure drops are basic, do you have the technology for flow?

For actual values, a calibrated device would be needed, but I was thinking an orifice and a manometer might be in the ball park.

I do have flow meters however they are for methanol injection flow so are very small. I suppose I could install one in some sort of a shunt configuration and do some calculations to figure out main circuit flow. It may not be 100 percent accurate but close enough.

I can only see being able to measure flow to radiator, but not what is recircing via the thermastat not being fully open during data gathering. Of course any data would have to specify the car's equipment.

I would think having an orifice monitor radiator flow as a perment gauge could give an indication of caviation at high rpm as temp would increase and flow fall.

I found some test plugs that claim they would allow insertion and removal of pressure of temp probe with system in service
http://www.petersenproducts.co...ure_Petes_Plugs.aspx

My system will not have a thermostat. It will be purely controlled by modulation of pump speed to maintain temperature therefore will not be as accurate for a stock system. Everything from firewall forward will remain stock configuration but with upgraded rad.

You should be able to know your flow based upon the pump speed. I would think pierburg provided such a curve and you would only need to correct due to restrictive pressure from plumbing.

which reminds me, beside the water pump manufactors not readily providing a flow(pressure)/rpm curve. I would think the radiator manufactors would provide a pressure/flow curve. that would be better than orifice

Do you know the method those MWI sensors mesure flow? so far I have not found googling.

EDIT: (bare with me as I am learning)

If you run an electric water pump without thermostat, what do you do about bypass flow during warmup

Yes I do have flow charts for the cwa400 pump. This particular setup allows pump speed to be controlled. I can turn down the pump to next to no flow. It may take a minor bit more time to warm up depending on how low the flow can be turned down but I haven't had a heater for 7 years anyway. I will be using my ECU for control but you can also purchase these http://www.tecomotive.com/en/tinycwa-en for a standalone application. The methanol injection flow sensors are a turbine sensor If I remember correctly. They output either a vr output or hall effect pulse. I cant remember which. Here is the flow chaft for the pierburg units.

Being that I live about 90 miles south of you, I had to convert cubic meters.

There is 264.2 gallons per cubic meter.
.

Lol, I am from Louisiana anyhow but I go mostly by liters these days. These pumps are made in Germany though. I suppose thats whats up with the whole m3/h thing.

^^^ ah, I thought you were in Victoria B.C.

To be clear, you are using these pumps for coolant, correct?
.

I do live in Victoria but originally from the states. The two larger pumps (CWA200 and CWA400) are designed to be used as primary cooling pumps for some BMW OEM engines like the Z4. The smaller ones are I think typically used as air/water intercooler circulation pumps. The nice thing about these pumps is that they have all of the high current circuitry built in for speed control. You feed them a 12v high current wire, ground, and a single low current wire feeding a square wave signal with varying duty cycle. 13% duty cycle is minimum speed and 90% duty cycle is full speed. This is easily configurable in most aftermarket fuel injection computers.

For myself and others that think in Imperial units.

I'll assume this one curve is for pump at full speed. I used typical pump performance relationship to derive the curves for operating the pump at 80%, 60%, 40% & 20% rated speed.

If you take the pressure across the pump at the various pump speed it will provide the restriction curve for flow through block, heads and radiator