Electric water pump

20ate

Member
I run a auxillary water pump from a 04-07 Dodge Durango about 10 dollars at junk yard around 50 eBay
 

Ted Hamilton

Helmet Painter / Racer
I think most are using a Bosch unit. I've been tempted to get a standard CIK pump, remove the pulley, and attach a r/c brushless motor with a piece of fuel line to connect them....calculate required voltage and add a r/c cell and potentiometer.
 

yamadog35

Member
Not inexpensive, but in the Enduro world which is what I know, some are using Davies Craig booster pumps. I know of 125 laydown shifter karts using the EBP15 model. I'm using the EBP23 model for a BRC 150 on a laydown kart (45 minute races). They can be found on eBay.
 

tecbigdog

Site Supporter

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tecbigdog

Site Supporter
We use the expensive small battery (darn thing costs about $80) that NAPA sells, but it holds a charge for a long time (I keep forgetting to charge it before a race). We have used these batterys for over a month without re-charging and they come from NAPA fully charged. I think any of the small motorcycle batterys would also work just fine.
 

Ted Hamilton

Helmet Painter / Racer
Bob - AGM batteries? Are you just running a switch in-line, and letting the pump run constant speed, draw on battery whatever it is?
 

tecbigdog

Site Supporter
Bob - AGM batteries? Are you just running a switch in-line, and letting the pump run constant speed, draw on battery whatever it is?
We only have a switch that cuts the pump off when the engine is not running, but when the engine is running the pump is running at a constant speed. Our water temperature never goes above 170 (running a 270cc Yamaha) measured with an inline sensor and running straight water and during the hot Florida summers. This pump will move about twice the amount of water that the Bosch pump moves.

Ted, Yes they are AGM (Gel type) batteries. The battery that we use may seem like an overkill until you realize that we are also running an air pump, for cooling the brake rotor, and an electronic ignition that will cut off below 9V. We just don't want to take a chance on the cheaper batteries.
 

tecbigdog

Site Supporter
Whats wrong with a pump off the rear axle,

When you are setting on the grid waiting to go out on the track, you are not cooling your engine. During yellow flags, the pump is pumping a minimum of coolant, engine temperature rises. During a red flag, your engine is already at running temperature and you have to get lined up at a slow speed, engine temperature again rises.

Actually, there are a few people running them, but we just like the electric ones better.
 

Yakattack

Member
You can order Camera batteries that are lithium ion from China for $10
680-780mha... will run 3 nights at 2 heats and a feature... without dyeing using the said pump in earlier post...
Buy a speed controller and control pump speed...

Using these for years with no issue...
 
got a radiator and pump set up for sale that zac lamb used on his rotary motors ! 100.00 + ship! had 2 of them sold one to tony jones for his 250 setup! like new!
 

Bigpants

New member
Hi everyone. Newbie here from the UK in need of help. Sorry to resurrect this 2 year old thread . I'm about to try to set up my first electric water pump (on a classic race bike) and I'm finding it difficult to get any real info. Your thread was the best I've found so far. I'm going to use the davis craig/bosch ebp 15 pump but it's batteries I'm having trouble with. Yakattack said 780mah camera batteries did a couple of races or did I misunderstand ? An online battery calculator suggested I'd need a 4ah battery to run it for an hour and that's a big battery for a little 125cc race bike. Any help much appreciated.
 

nobozos

Member
I run a 1.4 ah garage door battery for mine but UAS at most is only 30 laps. It's the size of a pack of cigarettes. It' good for a 2day show later Chuck.
 

yamadog35

Member
I ran a similar Davies Craig pump on my laydown enduro karts which run 45 minute races. I used these batteries available on Amazon:
https://www.amazon.com/gp/product/B00NBIMP24/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
That is a three pack but I'm sure you can purchase a single battery. I did a test once and the battery lasted about three hours before stopping. If you run short races I'm sure you can get by with a smaller battery. These proved to be very reliable for the racing I did.
 

twostroketoowoke

Site Supporter
Can these electric pumps overcome any distance or radiator configuration? I.e a small oil cooler mounted low out of the air on the left side nerf and hoses going from there to the engine and back. I ask because I had this setup on an axle driven pump and I feel like it didn’t provide enough speed to get water actually circulating. Not pictured is a water heater on the left side weight tabs that created a loop. So about 5’ of hose total. This motor runs incredibly cold so my idea was to get the cooler out of the air, but have a water heater so I could get up to actual temp before firing up.
 

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