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Electric Water Pump - Pumping Losses

Is Your Water Pump Costing Power?

By Mike Petralia

Test 3-Weiand # 8217 electric pump

Test 1 Test 2 GAIN Test 3 GAIN
O.D. U.D. U.D. Electric U.D. vs. Electric
RPM TQ HP TQ HP TQ HP TQ HP TQ HP
3000 390 223 393 224 3 1 396 226 3 4
3200 404 246 409 249 5 3 412 251 3 2
3400 415 269 418 271 3 2 421 273 3 2
3600 418 287 421 288 3 1 424 291 3 3
3800 419 303 423 306 4 3 425 307 2 1
4000 417 317 421 321 4 4 423 322 2 1
4200 416 332 419 336 3 4 422 338 3 2
4400 416 348 420 352 4 4 425 356 5 4
4600 415 364 419 367 4 3 424 371 5 4
4800 412 377 414 379 2 2 419 383 5 4
5000 405 385 407 387 2 2 411 391 4 4
5200 393 390 398 394 5 4 401 397 3 3
5400 383 394 387 398 4 4 389 400 2 2
5600 371 396 375 400 4 4 378 403 3 3
5800 359 397 363 401 4 4 366 404 3 3
6000 345 394 348 398 3 4 356 406 6 6
MAX 419 397 423 401 5 4 425 406 6 6
AVG 402 335 406 338 4 3 409 341 3 3

Would A Racing Pump Have Worked Better?
You're probably wondering why we didn't also test a Weiand Team G race pump? That's because, while those pumps will use even less power to run than the street pump, they're designed for a higher rpm usage than this motor would see. The racing pumps are typically made for circle track engines that rarely run below 4,000 rpm. Our street engine will rarely see above 4,000 rpm so we thought that'd kinda' be like running slicks on the street. Sure, we know it'd work better, but it doesn't make sense for the everyday commute. Also, race pumps have impellers that are designed for efficiency at high rpm and will flow even less water at idle. Therefore, they may also cause overheating in traffic, just like underdriving your pump might do.

The Weiand electric pump does not seal the bypass hole in front of the small-block, so we had to run a greased-up tap into the hole and install this plug to keep from spilling water all over the floor. The plug can be removed later if we want to go back to a mechanical pump, which uses this hole.




SOURCES
Dyno-Motive
Placentia
CA
7-14/-693-1317
Performance Distributors
Memphis
TN
9-01/-396-5783
performancedistributors.com
Edelbrock
Dept. 5.0
2700 California St.
Torrance
CA  90503
310-781-2222
www.edelbrock.com
Powerhouse Engine Components
931 19th St
Bakersfield
CA   93301
ISKENDERIAN RACING CAMS (ISKY)
16020 S. Broadway St.
Gardena
CA  90248
323-770-0930
323-515-5730
www.iskycams.com
Speed-O-Motive
131 W. Lang Ave.
West Covina
CA  91790
6-26/-869-0270
speedomotive.com
Lunati Cams
Olive Branch
MS
6-62/-892-1500
lunatipower.com
Weiand
N/A
800-HOL-LEY1
www.holley.com.
Moroso Performance Products
203-453-6571
moroso.com
By Mike Petralia
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