electric water pump
I'm still liking the notion of replacing the belt driven water pump with an electric one.
There are at least 2 ways, and a large variation in pricing from what I've found so far. There's the idea of hooking an electric motor to the existing water pump and taking the belt off. The other idea is to insert the electric pump in the lower radiator hose, and entirely disable or remove the belt driven pump. Prices would seem to range from $65 to $250 and higher. Testing indicates a gain of perhaps 5 HP. Anyone have any experience with this? |
Another forum is having this same discussion.:D
First, avoid the belt driven option. Why add more mechanical points of failure? Here is the premier vendor on the market today. Their pumps alternate speed depending on the water temperature in your engine block. The result is a system that will not operate a constant amperage but rather only pulls as much power as you really need. https://www.daviescraig.com.au/ |
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I like the idea of an electricall driven water pump AND fan. This would be particularly effective on short trips. Neither the fan or pump would come on until the cylinder head temp rose to 200 or so......
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The pump should be driven from start on for two very good reasons: - divide the heat equaly over the whole (!) engine to avoid stress (number one reason) - transferring heat to your cab heater when needed in winter The only acceptable compromise is a waterpump at very low revs while warming up. |
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The waterpump always circulates the water in the engine block and to the cab heater, also with a completely closed thermostat. I'm 100% sure. The thermostat will only change the waterpath: instead of returning immediately to the engine block it first goes to the radiator. The circulating is necessary for an equally divided heat in the block, as I posted. Imagine the stress around the exhaust valves and exhaust ports if the water doesn't flow. Water will start cooking over there already after a minute if there's no flow and the headgasket will break because of stress. No waterpump that I know is 'throttled'. |
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I see we have the same understanding though on how engine cooling works. |
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OK, I looked it up on Wikipedia, and watzisname is right. But I still like the idea of lowering water pump losses. Water pumps and radiator fans are designed for the maximum load an engine can put out at the highest possible air temperature... say 120 F in the sun in Death Valley towing a trailer.
So, an electric water pump that runs at 10% speed at 0 degrees F, and 100%at 200 F would save a lot of energy and not cause block and head problems. |
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If I may suggest another way to go to safe fuel by watertemperaturemanagement: install an electronically managed thermostat. Aim of the game: going for a high temp when no power needed, decrease temp when you need power. It's done by BMW in the 3-liter 6-cylinder if I'm not wrong. I'm not sure, but if I remember well the temp goes up to 110?C when idling and no power demand by driver. And it drops to 85 or 90? when the driver floors the car. Efficiency goes up at the higher temps (less heat loss in cylinders). But it will deliver less power at this high temp (less oxygen/air can get in the cylinders because of the heat). |
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