[Richard L]

When we supply a shurflo system to a user, we just supply a simple flow sensor on the water jet to monitor flow. If flow is in excess of 450ml/min, there need to use two sensors.

We have tried many ways to incoprporate the standard aquamist diagnostics circuitry to work with the Shruflo pump but failed to come up something reliable. The biggest problem is the huge flow capability even at low speed- imagine trying to compare two values decades apart.

The main problem is when the shurflo is running at low speed, the diaphragms produces very uneven pulses and it is very difficult to monitor. Alternatively we tried a wasted water method and also proved to be difficult. If only the Shroflo pump would flows a little bit less, it will be difficult for anyone to find a way to bridge that gap.

I know shuroflo has the capability to flow 3.8L a minute at 120psi - which engine will require a water injection system that will empty a gallon (US Gallon) of water in one minute.

1 litre/min of water will remove approximately 57 BHP!!! or 42KW. a full speed Shurflo pump will take 216 BHP out of an engine. Equivalent of bumping 6 gallon of gasoline. Calculation is based on the latent heat of water of 2256kJ/kg

We came to a compromise of using a priming pump and still retains the diagnositic capability of block jet and cut pipe. There are many systems out there claimed to have diagnostics capabilities abd progressive flow, but "none" has addressed the problem of detecting a block nozzle - the most important part of a water injection system.

So my conclusion is that it cannot be done at tehmoment niot that we haven't tried. I don't know what the answer is.