Modified alphacool top performance

[andersson.j]

The original inlet hole was 7mm and off center, after my modifications it's 12mm, dead center and a bit tapered.

Unmodified (7mm)


Modified (12mm)



Max flow test single pump
This test was performed at 12.3V with EK nipples, top mounted inlet and 1 feet 12mm ID tubing at each end.
I repeated 3-4 times for accuracy.

• Alphacool data: 600LPH
• Single unmodified: 900LPH
• Single modified: 1000LPH (11% higher max flow)

Max flow test two parallell pumps
This test was performed at 12.3V with EK nipples, top mounted inlets, 12mm ID Y-connections and 1.5 feet 12mm ID tubing at each end. I repeated the test three times for accuracy.

• Dual modified: 1350LPH (35% higher max flow)

Max head test
All tests were performed at 12.3V with EK nipples, top mounted inlet, 1 feet 12mm ID tubing at one end and 7m+ at the other.
I repeated a couple of times as air in the pump made a huge difference.

• Alphacool data: 4.7m
• Single unmodified: 6.6m
• Single modified: 6m (11% lower max head)