Water Pump Flow rate?
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Just measure the bore of the top hose and calculate the flow rate that will give you 2.0 metres/second velocity.

Then get a pump that will deliver that flow at 1 bar (15 psi) total head.

That will then give you the 30 psi in the block when the rad is running at 15 psi.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Fluck me, just gone online to see about buying a pump in the US.

Works out at £190 posted within the US. I'm heading to New York after christmas so may get one posted to the hotel. Thats nearly half price!

I wanted to get a load of stuff from summit this time but i was always moving hotels so couldnt.

Suddenly realised that I've got a big 12v water pump in my motorhome. If it's man enough for the shower then might be big enough for your needs.

Have a look at these:



Not sure how long they would last, but hell of a lot cheaper.

Here's another link:

Edited by Paul S on 24th Dec, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hi,
I thought caravan pumps were cold water only? Although there's no mention of temperature in the specs....
Cheers,
Gavin :)

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i'd be concerned how well they last with the higher temps. these pumps usually push the water through the system so only see cold water.

also my mum and dad's on the caravan that gets used a fair bit fail regularly. not something i want when my engine was red hot!

Also the seals may not cope with anti-freeze.

Anyway, just a thought.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

How about one of these driving the standard pump?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

starting to sound heavy and to be honest, bulky

a shower pump may provide a pump that could be driven with a 12v motor. it has to deal with hot water etc. not sure how small you can get them though.

This is what andre uses http://store.summitracing.com/partdetail.a...15&autoview=sku i believe

they look fairly good, 20gpm is a fair chunk of water, just how would you control the rate?

i like them though and the price is good!

I run a thermostat with it. They are designed to work together with a normal thermostat with a hole in.

ah ok, sounds simple enough, purely an on/off with the ecu type thing along with a delay timer no doubt.

hmm choices!

correct Iain!

Any of these any use...?

http://cgi.ebay.com/ebaymotors/Bosch-PAA-h...sspagenameZWD1V

http://cgi.ebay.com/ebaymotors/Bosch-GM-au...sspagenameZWD1V

http://cgi.ebay.com/ebaymotors/VW-BOSCH-El...sspagenameZWD1V

And, I've been told that the KAD pump is actually out of a coffee machine.

So take out of that what you will.

Si P

I drill holes in everything..!

Hmm thats an interesting one, the top ebay link says it will flow

5.6gpm which is 25.45 L/min at 11.5V

KAD pump flows 18.5 L/min at 12V

If you were to run the top pump at 12V you would get a flow of 27.27 L/min approx. considerabley more than the KAD one.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Is the KAD item rated at 18.5 l/min with no resistance?

TBH I don't know, it doesn't mention anything on their site about how they tested it?

As far as ive seen whilst seaching for pumps, the flow rates given seem to be given in an unpressurised system!

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1/4mile in 13.2sec @ 111 terminal on 15psi

Have a look at the pump curves in the top two links above. What this tells you is the flow rate against pump lift (pressure differential). The higher the lift the less flow. We are only talking 2 to 4 psi, which is nothing, you would need a fairly unrestrictive rad, and thermostat.

You could always omit the thermostat.

Sprox,

If you read that link you posted above, it says that you need 30 psi in the head and 15 psi in the rad. The pressure difference is caused by the flow through the thermostat.

Hence, you have a total head of 15 psi, (30 -15)or approx. 10 metres water head.

If you omit the thermostat, you will not get the cooling system to work properly at all.

Edited by Paul S on 26th Dec, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hi,
Those pumps in there usual application are use as booster pumps for heaters, so I don't think they'd be up to the job...
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

Wasn't Jon Flanigan using a heater pump from a Renault savanna that was running 28 L /min (unrestricted) with good results?

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1/4mile in 13.2sec @ 111 terminal on 15psi

Yeah he was, somewhere there was a pic of him shooting water into a paddling pool with it

Im trying to find out what the flow rate of the one that i previously tried was

It was enough to keep it cool on idle, but when giving it some beans it couldnt cope at all

It was a merc one wasn't it? If so Andre tested one at 20 L/min?

Is this the pic you were after?

Edited by matty on 26th Dec, 2007.

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1/4mile in 13.2sec @ 111 terminal on 15psi

thats the pic

And yes it was a merc one, ive been looking on tinternet at it to find the part no.
the merc part no is 001 835 13 64, but this doesnt seem to relate to things ive found so far on the bosch site