ssym

Does anyone have tech data on mechanical water pumps. Specifically flow rates at different RPM's. How much an advantage over stock with an aftermarket "High Flow"?

All the electric pumps advertise flow in GPM (they don't say at what pressure).

I'm trying to answer some questions about pully drive ratios, rpm's, flow rates, and pressure.

Thanks, Steve

oldandtired

Interesting question. The electric flow rates are what they are.
The driven pump rate will always depend on drive ratio.
Dave

TheYellaBrick

And RPM.....

ssym

I found this on Stewart's site. Interesting. They are both "High Flow" pumps. An electric pump will work well for street cruising between 2000 and 2500 rpm, but maybe not at sustained high rpm. At the drag strip I think an electric is by far better.

I am certain at high rpm with high flow there would also be higher pressure (good thing). Pully ratio would be nice down low, but with a penalty up high.

You can see where the numbers go:

Flow in GPM (Gallons Per Minute)
RPM Competitors Pump Stewart Stage 1
1000 17 18
1500 25 32
2000 34 42
2500 42 55
3000 51 65
3500 59 77
4000 68 90
4500 76 101
5000 85 112
5500 93 122
6000 102 132
6500 110 138
7000 119 148
7500 127 157
8000 139 158

Their site is a good read:

http://www.stewartcomponents.com/Tech_Tips.htm

Steve

ssym

And then there is this from Edelbrock...

http://www.jegs.com/edelbrock/graphs/350-8810.jpg

JEFF69Z28

electric pumps will always be the same since the engine is not driving it.