wodge
Part of things
Posts: 455 
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Mar 26, 2022 22:49:16 GMT
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Any one repurposed one in a classic? Davies Craig ones have got expensive.
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Last Edit: Mar 26, 2022 23:06:18 GMT by wodge
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lebowski
Part of things
Hillman Avenger, Clan Clover
Posts: 476
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Mar 27, 2022 18:55:28 GMT
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Yes. I have a Pierburg CWA 200 with a Tecomotive controller. It works very well and the controller has some nice features like running on after shutdown for a minute or two.
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Mar 27, 2022 19:25:46 GMT
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is yours a real pump or a chineese copy? this is something I'm looking into for my car too.
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lebowski
Part of things
Hillman Avenger, Clan Clover
Posts: 476
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Mar 27, 2022 19:38:16 GMT
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It's a real one, but I bought it used. There are plenty of them on ebay.
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wodge
Part of things
Posts: 455
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Mar 27, 2022 20:28:39 GMT
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How clever are they? I wasn’t going to bother with the fancy controller I read I could just give it 12v and ground and then a second 12v to pin 3 with a 1k resistor and it will be full on. I was going to then experiment with a manual pwm on the main 12v feed to slow it down a hare but I don’t know if this will shut it down.
I’m planning to run a second electric helper pump in the heater hose for redundancy so I could just use this alone and have the main pump on a relay and a fan switch to go flat chat when the engine is hot. I might eventually do something smart with an arduino and my own code that I can fix in the field but not keen on an expensive magic box tbh.
Has anyone taken a pump apart to just use the motor and pump and not it’s brain?
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ChasR
RR Helper
motivation
Posts: 10,192
Club RR Member Number: 170
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BMW 335i Electric WaterpumpChasR
@chasr
Club Retro Rides Member 170
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How clever are they? I wasn’t going to bother with the fancy controller I read I could just give it 12v and ground and then a second 12v to pin 3 with a 1k resistor and it will be full on. I was going to then experiment with a manual pwm on the main 12v feed to slow it down a hare but I don’t know if this will shut it down. I’m planning to run a second electric helper pump in the heater hose for redundancy so I could just use this alone and have the main pump on a relay and a fan switch to go flat chat when the engine is hot. I might eventually do something smart with an arduino and my own code that I can fix in the field but not keen on an expensive magic box tbh. Has anyone taken a pump apart to just use the motor and pump and not it’s brain? If it's like the Davis Craig pumps -The brain most likely will be the ECU -The duty is quite variable, from slow to quite quick. My Dolomite Sprint Davis Craig eWP worked in this format, and it worked well. When the pump ran at full whack due to a fault with the controller, I did have to retorque the head. it was leaking between the head and the block. Maybe it was going far too much, or the engine had other issues. it seemed fine after the retorque however. The high speed bit almost never kicked in. I'd have to be stuck in traffic for about 20 minutes for the high speed to cut in. Ideally, I'd want a controller, mainly to avoid heat cycles and 'shocks' to an engine. EWPs, are a handy way to gain BHP (albeit, not loads), superior cooling (the pump will work independant of engine RPM, and can potentially run with the engine off), and CO/MPG savings. It's not a magic thing that brings those things to the table, but it certainly does help when combined with other things, which I've seen in a few N52'd BMWs and moreso with the N53s, albeit with more reliability issues with the latter around the fuelling system. They wouldn't put them into a car if they were just a gimmick, as cost is scrutinised very hard on cars. I've seen eWPs be pulled from engine development before, due to cost. |
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Last Edit: Mar 28, 2022 2:50:22 GMT by ChasR
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ChasR
RR Helper
motivation
Posts: 10,192
Club RR Member Number: 170
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BMW 335i Electric WaterpumpChasR
@chasr
Club Retro Rides Member 170
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How clever are they? I wasn’t going to bother with the fancy controller I read I could just give it 12v and ground and then a second 12v to pin 3 with a 1k resistor and it will be full on. I was going to then experiment with a manual pwm on the main 12v feed to slow it down a hare but I don’t know if this will shut it down. I’m planning to run a second electric helper pump in the heater hose for redundancy so I could just use this alone and have the main pump on a relay and a fan switch to go flat chat when the engine is hot. I might eventually do something smart with an arduino and my own code that I can fix in the field but not keen on an expensive magic box tbh. Has anyone taken a pump apart to just use the motor and pump and not it’s brain? That kind of pump would be overkill if it's just for heating. I think possibly for even assisting the main pump it would be. Pumps like the one you desire do exist, and for far less (around £80-130 new for a Bosch branded one). Mercs and BMWs had parking heater pumps. From the cars I had: -All W124s (250D, 300D (I think it had it), and the E320) -C209 CLK 270 CDI -E46 M3 Had auxiliary pumps. With the other cars -S1 Escort RS Turbo ; It didn't have a pump, but I fitted one from a Focus RS Mk1, which did have them. I fitted it as like the Mk1 Focus, it had a chargecooler setup over an intercooler ; Fitting an intercooler on an S1 of a decent size is very limiting unless you chopped the front up on a Series 1. Chargecooler was one way around it. With 100BHP more than the factory, I was limited in what I could do. -944 Turbo, had one and its own thermostat to control the the turbo cooling from memory. It used to run for quite a while after the engine was turned off. On the M3, the pump actually massively assisted the bleeding process. BMWs IME are normally a pig to bleed. This made it a piece of cake. |
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lebowski
Part of things
Hillman Avenger, Clan Clover
Posts: 476
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How clever are they? I wasn’t going to bother with the fancy controller I read I could just give it 12v and ground and then a second 12v to pin 3 with a 1k resistor and it will be full on. I was going to then experiment with a manual pwm on the main 12v feed to slow it down a hare but I don’t know if this will shut it down. I’m planning to run a second electric helper pump in the heater hose for redundancy so I could just use this alone and have the main pump on a relay and a fan switch to go flat chat when the engine is hot. I might eventually do something smart with an arduino and my own code that I can fix in the field but not keen on an expensive magic box tbh. Has anyone taken a pump apart to just use the motor and pump and not it’s brain? I appreciate wanting to save money, but for the £130 or so that the controller costs I really don't think it's worth skimping on this. The pump on full chat will be running way too fast and drawing a lot of current. The 'smart' part of the electric waterpump is the best bit in my opinion. |
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wodge
Part of things
Posts: 455
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Mar 28, 2022 19:29:49 GMT
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On balance the bmw pump and controller is still a good chunk less than the Davies Craig and it occurred to me the pump motor is likely brushless so will need some sort of controller anyway.
I was going to run a cwa pump in the bottom hose and then a smaller helper pump in the heater hose for redundancy in case of failure of either main pump or main pump control mechanism. But perhaps I’ll just keep that in the boot for emergencies as it seems overkill.
Thanks all for the input
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mrbig
Part of things
Semi-professional Procrastinator
Posts: 461
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Mar 29, 2022 12:13:44 GMT
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If you are going to run an electric primary water pump from a BMW then you shouldn't need one of the small 'secondary' ones. The motor controller is built into the pump IIRC so you shouldn't need that.
I'm sure Davis Craig used to use one of the BMW ones in their own range but I can't find it now.
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1969 German Look Beetle - in progress
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