Check your nozzles!
Recently, I'd noticed that my rate of consumption has been down quite a good deal. IOW, I haven't had to fill the tank for a while. Did a pressure-test on the system and found that the pump was operating normally, so I pulled the nozzle out of the inlet pipe to inspect it.
Now, we all know what a normal, healthy nozzle looks like on the inlet side, right? http://img30.imagefra.me/img/img30/2...7m_1534c19.jpg Right, it's got a cute little filter screen, made of stainless steel, around the inlet to prevent foreign matter from clogging the delicate little hole in the end. Well, here's what mine looked like: http://img31.imagefra.me/img/img31/2...0m_d07579e.jpg WTF, right? Where did the screen go? After a brief search, I found most of it at the bottom of the nozzle assembly, clogging the hole that it's supposed to be protecting: http://img30.imagefra.me/img/img30/2...1m_4cda2e1.jpg Nice, eh? This particular nozzle was purchased from one of the major kit vendors, and has been installed on the car for about a year and a half. I've been running about 1/3 methanol to distilled water, which is certainly not an excessive amount. And yet that little screen simply disintegrated. Can't imagine how long it would have lasted were I running 50% methanol, as is the case with the "boost fluid" sold by most of the WI kit companies as being compatible with their systems. On the plus side, I hadn't re-mapped my ignition table since moving from CA to FL, and apparently that 93 octane gasoline is some pretty good stuff as I hadn't been getting any knock. On the minus side, this was the one failure more that my failsafe system couldn't detect, and of course, it's one that I never expected to happen. Needless to say, I'm done with Meth. From now on, it's pure water. That, and apparently I need to advance my ignition a bit more. :D |
???Methanol doesn't eat steel??? Did it rust or what?
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Wow. Strange.
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Originally Posted by sixshooter
(Post 439665)
???Methanol doesn't eat steel???
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Wow, dat iz teh gayz :greddy:
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one more reason i dont use nozzles with screens good catch man im glad you saw it before bad stuff happened.
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Wow.. gonna check mine tonight!
Joe, on a related question, I have been looking for a flow switch as a fail-safe guard for the WI. I think if a I ran a flow switch in series with a pressure switch (on the pump outlet) that it would guard against just about any type of WI system failure: Line rupture or leak - flow, but low pressure Clogged line or nozzle - pressure, but little or no flow Low or empty tank - no pressure or flow In your quest for developing the ultimate WI system I am wondering if you found any small, inexpensive flow switches that toggle at low flow rates, like 3-6 GPH. Not a meter, just a switch, like a paddle switch type. I have been looking, albeit somewhat casually, and have not found anything yet. I want to redo my WI failsafe to use flow and pressure monitoring on the pump outlet, and have it trigger timing retard on the ECU. I know how to do it all, I just need the flow switch. Thanks in advance. |
why do you even run meth? meth is good for substituting for fuel but water is WAY better at cooling
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Damn. I knew it would promote rust but didn't really think it would eat steel. Well, I learned something today.
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Originally Posted by ZX-Tex
(Post 439685)
In your quest for developing the ultimate WI system I am wondering if you found any small, inexpensive flow switches that toggle at low flow rates, like 3-6 GPH. Not a meter, just a switch, like a paddle switch type. I have been looking, albeit somewhat casually, and have not found anything yet.
Originally Posted by UrbanSoot
(Post 439688)
why do you even run meth? meth is good for substituting for fuel but water is WAY better at cooling
In the time since, I've been doing a fair bit of reading which indicates that water, by itself, is a highly effective anti-detonant, and I simply never got around to purging the system. It's done now, and it's going to stay that way. Anybody here know why all those smart fellows in white coats even bothered with methanol back in the 40's during the heyday of liquid-injection research? Antifreeze. They tested a whole bunch of different alcohols, and methanol just happened to be the cheapest and most widely available that they could find to stop the water from freezing up inside the tanks and lines on the aircraft when they were parked on the ground. (During flight, waste heat from the engines was used to warm the fluid.)
Originally Posted by sixshooter
(Post 439696)
Damn. I knew it would promote rust but didn't really think it would eat steel. Well, I learned something today.
Originally Posted by magnamx-5
(Post 439681)
one more reason i dont use nozzles with screens good catch man im glad you saw it before bad stuff happened.
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Also, a note on pressure switches.
I had previously been using the switches that Devil's Own sells, the ones that look like this: https://www.alcohol-injection.com/im...e_switch_s.jpg I've had two of those switches fail on me. Both times, the plunger locked in the fully extended position, forcing the switch on all the time. Not the way you want a failsafe switch to fail... Figured it out when I noticed that changes made to my Spark1 map weren't having any effect- the ECU was being forced into Spark2 all the time. I am now using a genuine Hobbs brand switch, which looks similar to this one: http://img27.imagefra.me/img/img27/2...lm_e1a0d3b.jpg I got it on eBay for about $15, so it's both cheaper and appears to be much more robustly constructed. There are dozens of different models and most are adjustable within a wide range by removing a rubber cap on the back and turning a screw with an allen wrench. I set mine on the bench (using compressed air and a regulator) to close at 35 PSI, giving me a setpoint of 20 PSI above system pressure (you have to account for MAP pressing against the outlet side of the nozzle) which should be a reasonable turn-on point. |
Boost Pressure Switch - For Turbo Water Injection hobbs:eBay Motors (item 230364469681 end time Aug-12-09 15:11:12 PDT) i use these nvr had a problem to date.
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Originally Posted by Joe Perez
(Post 439706)
Also, a note on pressure switches.
I had previously been using the switches that Devil's Own sells, the ones that look like this: https://www.alcohol-injection.com/im...e_switch_s.jpg I've had two of those switches fail on me. Both times, the plunger locked in the fully extended position, forcing the switch on all the time. My water consumption rates have not been horrible, so I may just stay with the simple single stage on-off system for now. Really though, to do programmable progressive WI, all I need to do is go buy a less than $100 IGBT/SSR (packaged, with supporting circuitry and terminals) and wire it to the Adaptronic. Done. The Adaptronic has fully programmable PWM outputs, just need the IGBT/SSR to provide enough power to the pump. Also, good point about the flow switch. That would not work for progressive WI. I had considered that. A flow meter would require some feedback monitoring to compare commanded versus actual flow to work as a fail safe, and that is beginning to get complex/expensive I think, unless you have any ideas. Even for single-stage on-off WI, a flow switch would work best if it was matched to a particular nozzle, or at least within a small range of nozzle sizes. Ultimately, there is no inexpensive and/or easy substitution for periodic nozzle inspection I suppose. |
Originally Posted by magnamx-5
(Post 439712)
Boost Pressure Switch - For Turbo Water Injection hobbs:eBay Motors (item 230364469681 end time Aug-12-09 15:11:12 PDT) i use these nvr had a problem to date.
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joe is there enough flow velocity / pressure drop in there to cause cavitation in the screen? perhaps it simply aerated itself to death.
http://coolrulespronto.files.wordpre...izzathehut.jpg |
Not super cheap but how much did you spend on your engine and is it important to you?
IFS-30C - Injection Fail Safe - Combo |
Originally Posted by y8s
(Post 439720)
joe is there enough flow velocity / pressure drop in there to cause cavitation in the screen? perhaps it simply aerated itself to death.
Originally Posted by ZX-Tex
(Post 439717)
Damn it, I have TWO of those. One to trigger the WI, one as the failsafe switch. Sticking plungers FTL.
Originally Posted by ZX-Tex
(Post 439717)
Ultimately, there is no inexpensive and/or easy substitution for periodic nozzle inspection I suppose.
The gadget that Thymer posted is a good idea so long as you have a controller capable of reading and responding to it. I intend to implement flow monitoring of that nature in my next system, just wish I could figure out who the OEM supplier of the flow metering device inside that box is. I can't find a good source of inexpensive flowmeters right now. |
Originally Posted by Joe Perez
(Post 439753)
The gadget that Thymer posted is a good idea so long as you have a controller capable of reading and responding to it. I intend to implement flow monitoring of that nature in my next system, just wish I could figure out who the OEM supplier of the flow metering device inside that box is. I can't find a good source of inexpensive flowmeters right now.
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what is the possibility you accidentally made a methanol fuel cell and it just ate the stainless?
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I don't have meth on my Miata but so on my Stang. I don't use and saftey switches but I did move the air intake temp sensor in line with the meth so it directly cools the sensor and tune to a temperature and if its over that temp it pulls timing. Its fail proof because you are not depending on floats and such also of lines get clogged for what ever resin it does not cool sensor it pulls timing.
I'm running straight 100% meth. Put some meth on your finger and some water, tell me what feels cooler??? |
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