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Old 05-22-2010, 10:05 AM   #1
Farmallgray

Name: Farmallgray
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pressure switch, water inj system

I'm setting up an electric water injection system on my mini puller (68 CI 3 cylinder diesel). What is a better boost switch to use? I can get a Hobbs switch that is factory set at 15psi but is adjustable. I can drill & tap the intake pipe for this, or I could go with one of these;
Boost Pressure Switch - For Turbo Water Injection hobbs: eBay Motors (item 230476807846 end time May-25-10 21:27:32 PDT)

I read somewhere that the Hobbs switch may not do as well in the intake pipe because of vibration the contacts may bounce. The other switch would be isolated by the hose. I'm looking for opinions on which would be better.


Also, I'm going to running a 250psi pump. What are the advantages and disadvantages of running a solenoid valve? Or could I just get away with check valve?
 
Old 05-22-2010, 10:43 AM   #2
Jim Fulmer
 
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I've been using this type for many years, you can get them through just about any supplier like summit or jegs ect...example ATP BCS-003 Hobbs Switch, Boost Activated - Modern Automotive Performance

I would not run them in the pipe but tap into boost some were and run it to the hobbs switch.

Jim
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Old 05-22-2010, 04:35 PM   #3
XLR8R
 
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We've used both types without issue - usually the first for remote applications and the second for direct mount.
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