Under the Hood: DodgeSRT-4
Here's an important detail when you're trying to cool 223 hp. Water pumps are made up of several vanes arranged around a disc-shaped rotor, and the water between these vanes gets flung to the outside as the pump spins. Typical water pumps have exposed vanes, and the trapped water is surrounded by a vane on each side, the rotor, and a machined face in the block or front cover where the water pump is mounted. There is a small gap between the vanes and this machined face, though, so water can leak past into the next chamber. The old Chrysler 2.4-liter pump was a six-blade stamped steel piece of junk. Switching to a fully shrouded seven-blade plastic pump increased pump flow by 24 percent and output pressure by 48 percent. That's better.
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