Re: Why don't we see more PWMV kits on diesels
The dynamic range of the FAV on all our HFS-xxx is over 10:1. If we extend the starting point at a lower duty cycle, is can be over 100:1.
A typical PPS system starts at 25% pump duty cycle and finishes at 100% DC. Below 25% DC, the pump may not start expecially the lines are pressurised.
1. The pressure change between those two points are 60psi to 250psi.
2. The flow change between those two points are 250cc to 500cc/min.
Therefore the dynamic rannge (DR) is x2 at best. The DR will reduce under the following conditions:
3. A check valve is added
4. Against boost pressure
5. The pump is unable to maintain the same pressure at higher flow demand.
Conclusion: At best, a PPS system will only attain a DR of 1 to 1.7x
I believe your comments made good sense, the PWM valve system is more suitable for the diesel than I first thought. Thank you for pointing that out.
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Richard L
aquamist technical support
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