333pg333

Are there any specs on what the stock water pump is rated at? As in how many litres or gallons it moves max a minute?

Dubai944

Hey that sounds like a great science experiment!

I am picturing a fire hose, a big bucket and your engine running unloaded at 7000rpm for a minute

333pg333

Did you see the drawings??
;-)

mikey_audiogeek

Sounds like you've been talking to a Mr C. Davies?

Paulyy

What would be interesting is knowing the 2.5 vs 3L pump.

V2Rocket

Most of the nicer EWP kits have an electric controller with PWM control of the pump based on demand...

You could just play with PW "duty cycle" for the pump and keep track of coolant temps to figure the sweet spot empirically.

Or, just do the bucket test...stick the lower rad hose end into a big bucket of water on a running engine and let it suck the water up and pump through the engine/radiator, and out the radiator port into another bucket...time how long it takes to use X amount of water?

333pg333

We're considering a few options but it's been decided that having more flow is better than less. ie One locally made pump works at max of 39 gals per min where a recommended US version is rated at 55 gals pm. So that's quite a difference. If, for whatever reason it's too much we can restrict it somewhere but already thinking of sending 2nd line to rear of head. I think there's quite a large hex bolt back there?
Need this for motor that spins well over 8k.

thingo

Keep an eye on flow vs pressure, I found the davies craig works well, no coolings problems with my motor.

333pg333

I thought of that but I can't think of a way of determining flow with any accuracy?

Paulyy

Can you control the speed of the electric ones?
For example by lowering the voltage to the pump getting it to spin slower thus less flow?
If so, You could get the motec to control the pump by engine temp. A trigger from the ecu to a relay switching it from a full voltage circuit to a restricted voltage circuit.

333pg333

I would say all that is do-able Pauly. Can easily opt for the same one Rod has and there haven't been any issues for him.

This was the brand that was recommended to me.

https://www.meziere.com/Products/Coo...tor-Mount.aspx

mikey_audiogeek

Hi Patrick, are you comparing apples with apples?

The U.S. liquid gallon and the U.S. dry gallon are different units defined by different means. The U.S. liquid gallon is defined as 231 cubic inches and equates to approximately 3.785 litres. One imperial gallon is equivalent to approximately 1.2 U.S. liquid gallons.


The pump curves are steep enough that you don't need to measure flow.
Just measure differential pressure and use the pump curve to calculate flow.

E.g for the EWP150, a close approximation is:

flow (l/min) = 150 - (2.5*deltaP)

where deltaP = differential pressure across the pump (kPa)

Linear approximation looks close enough so you could even do the calc in your ECU and display flow directly on the dash/datalogger.

You can probably corroborate this to some extent with your temperature measurements in/out of the block/head/radiator.

Cheers,
Mike

Paulyy

Oh I hate imperial. for those reasons and more!

I'm assuming you want to know the stock pump flow rate to get an equivalent or better electric pump?

If Rods one works, i wouldn't second guess it either.

thingo

I meant the specs of the pump flow at what pressure. Davies Craig has a graph, I can't see one for the Meziere.

333pg333

Both list a spec per gallon so I assume they've got that format correct...although stranger things have happened. I'm sure there's plenty of options and either should be fine. Advantages of both.


For sure. Hard to knock something that works on a somewhat similar motor...and I'm not actually knocking the DC version at all. It's just that the Mez was recommended and I'm looking at it.

Not sure yet Rod. But if one pumps more than the other absolute then that may be one part of the equation.