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Originally Posted by Jabo
Your hunt for pumps cathar... have you tried car pumps, thet are 12 volt pumps, aren't they. I do not know almost anything about car cooling pumps but... maybe sb does? It could possibily be a very cheap source of pumps (car scrap yards).
Second thing, I was entertaining thought of buildong a water pump from scratch? Has anyone ever tried it (oc community)?
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Almost all car pumps are belt driven from the main motor rotational action. Very few regular cars actually use 12V electric pumps to circulate the water. Some of the more modern cars will use small pumps to circulate water after the engine has turned off, but such pumps are typically quite noisy and not really rated for continual use. They are only meant to kick in for a few minutes at a time when the car is turned off.
The one 12V car pump that's commonly available is the Davies-Craig EBP, and I actually own one of these pumps. Performance wise it's just a little better than an Eheim 1250 (~2.4mH2O pressure head, ~22LPM peak flow). It's actually rated for continuous use, being designed as a booster pump to continuously boost water flow for high performance engines instead of driving the flow from a belt pump attached to the engine.
Davies-Craig also make the EWP, which is intended as a serious water pushing system for high-performance engines and has some pretty impressive stats, but it's only rated for about 6 months of continuous use, is pretty expensive (~$250US), draws a lot of power (comparitively) and is quite noisy.