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03-13-2006, 11:21 AM | #1 |
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Demand or Pressure System?
So what do people feel are better? Pressure type systems or on demand type systems?
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03-13-2006, 12:58 PM | #2 |
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Could you explain the difference between the two ? Is it something to do with the Shurflo's damand switch?
I assume the "pressure" type is controlling the pump speed to vary delivery? Richard |
03-13-2006, 02:55 PM | #3 |
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my shurflow setup surged something horrid.
i tried running a fuel pressure regulator inline to keep things nice and consistant. i had a solinoid before the regulator that opened at 1psi, then the regulatpr would see pressure and recirculate as needed. it still surged after about 45 seconds. adjusting the pressure threshhold on the pump seemed to help, but it would seem to shift from hour to hour. i figured enough was enough and ordered a smc setup. |
03-13-2006, 03:36 PM | #4 |
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This is a much simplier solution to your problems.
Richard |
03-13-2006, 10:03 PM | #5 |
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What I mean is the systems like mine I would call a pressure system that hold pressure all the time and wait until the need for water just releases the pressure once triggered.
The demand systems are the ones I think like the SMC kit that has to start/prime the pump when the demand for water is needed and pressure is made at that point. |
03-14-2006, 01:52 PM | #6 |
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right, but on the demand setup, your inlet pressure rises way faster than your outlet can de-pressure.
the pump goes on/off/on/off/on/off while spraying. you can adjust the 'on demand" pressure point, but in my experience that only delays the problem. |
03-14-2006, 02:25 PM | #7 | |
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Why not getting an aquamist System2x, it is on-demand, and do not spike between 85-120psi, when a 30cc surge arrestor is used, the water pressure is held pretty steady, ripple is less a few psi. |
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03-14-2006, 09:00 PM | #8 | |
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03-14-2006, 10:59 PM | #9 |
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I am running a dual-nozzle/duel solenoid system. I have my shurflo pump keep the line pressurized all the time. When the utec or the pressure switch(set at 7psi) open their respective solenoid, the line pressure now has somewhere to go(out the nozzle) and the pump will automatically turn on to maintain pressure. To prevent oscillation in pressure I have an Aeromotive FPR to maintain 80psi + Manifold pressure, which is sitting on the other side of the solenoid that opens first(the 7psi pressure switch one).
I hope this helps. Jeff |
03-17-2006, 01:34 PM | #10 | |
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i was using the 60psi pumps... maybe that was the root of my issue to begin with. |
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03-17-2006, 02:58 PM | #11 |
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yea, you should probably go higher pressure. Better atomization is the obvious benefit.
Has anybody contemplated a multi-port injection system? I like what Perrin did with their H-6; the per-cylinder water injection is pretty nice. All it would take is a few drilled holes into the manifold and 4 nozzles. I have not been able to find any nozzles like the $19 ones from aquamist; it needs to have threads on the front so you can mount it right into the metal like they do. I dont want to put the traditional hago nozzle into the intake runner, I think it would obscure too much of the passage and restrict airflow. Jeff |
03-17-2006, 03:05 PM | #12 |
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Also, for cheap nozzles that are just like a certain company I wont mention, check out http://www.mcmaster.com/ and go to page 1939. This is the kind of nozzle I have been using for years and they work great.
---- Standard and No-Drip Misting Nozzles 3178K61 - 1gph@100psi 3178K62 - 2gph@100psi 3178K63 - 3gph@100psi They go up to 10gph, these are just examples ---- Jeff |
03-18-2006, 01:51 AM | #13 | |
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Quote:
Seems logical that pressure type systems would be better, but it would probably be best to have one with a rrfpr. The further away from the cylinder the water is injecting, and the more intercooling effect there will be and possibly the less in cylinder cooling there would be. Maybe it would be best to inject near the intercooler and direct port? Only problem is that if you're gonna use that many nozzles, you will need to be running a lot of water to get propper atomization, and the holes in the nozzles will have to be small which might cause quicker change in flow over time and clogging. At least that's what it I think. peace |
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03-18-2006, 09:58 AM | #14 |
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Yeah, with TINY jets for individual port injection, I would really worry about having only one clog and leaning out that cylinder something fierce.
The mini water hammer arrrester is an interesting idea, but I doubt it would stand up in an automotive environment, and I am pretty sure that they would not be happy with methenol running through them. I have wondered about using a log-type accumulator to help keep the pressure pulses in check.... |
03-18-2006, 10:16 AM | #15 |
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Use the Shurflo Accumulator, its plenty big enough and once u set the pressure you are done with it, and its like 30$ But also i would run the 100 psi pump
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