Thread: 348/409 reverse flow water pump help

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Originally Posted by techinspector1

Conventional V-belts turn the water pump clockwise. A serpentine belt turns the water pump counter-clockwise. There is no advantage one over the other. Some folks prefer one over the other for whatever reasons, maybe braggin' rights down at the Sonic, I don't know. Personally, I prefer whatever works for cheap. You still have to carry a spare, V-belt or serpentine.

100% correct. When you look at the specs for a water pump they say 1) what engine, and 2) what direction does your water pump rotate. The "reverse flow" terminology came about with the advent of serpentine belts, when it became easier to rotate a pump backwards for belt routing. The terminology has caused all sorts of confusion.

As for "tangential", if you look at the impeller and draw a radial line from the center of the hub to the outside diameter, the flow is at 90 degrees to that line as it rotates, tangent to the circle. If you look at the case casting, the void hugs the impeller, and then starts to expand away forming an increasing volume for the flow. That's what captures the energy of the flowing water, and creates the pump differential pressure.