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High speed valves
Has anybody ever found a valve which is compatible with the frequencies encountered in a MegaSquirt application- IOW, injector frequency?
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The Aquamist one may work.
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It's pretty spensive though if I remember correctly.
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Yeah, I'm not really interested in spending $500 for a pair of solenoids.
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$500 ??? !!! Damn!
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Yeah, they seem tun run about $250 - $270 each. For what I had in mind, two would be needed.
The coolingmist HSV might have worked, and was somewhat cheaper, but they're apparently discontinued. When I get back home, I'm going to spend some time mapping out the performance curve of the PWM pump controller. Who knows, maybe I'll be pleasantly surprised. I doubt it, but there's always the possibility. Random but serious question: some high performance engines, such as found in Champ, Indy, USAC, some classes of drag racing, etc., run on pure methanol. At least some of these engines are fuel injected. What kind of injectors do these guys run, and would said injectors survive a methanol / water mixture? |
mcmaster sells a slew of 60Hz valves but I'm not sure if they're PWM compatible or just operated at 60Hz.
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Originally Posted by Joe Perez
(Post 415022)
Random but serious question: some high performance engines, such as found in Champ, Indy, USAC, some classes of drag racing, etc., run on pure methanol. At least some of these engines are fuel injected. What kind of injectors do these guys run, and would said injectors survive a methanol / water mixture?
Not sure whether they used some methanol resistant injectors or just replace injectors after each race. Here is what RC Eng. say about theirs: What type of fuels are your injectors suitable for? Our injectors are suitable for gasoline as well as leaded race gas. Alcohol/methanol is extremely corrosive and should only be used for race only applications where the user can drain the alcohol/methanol and “pickle” the entire fuel system with gasoline at the end of each day. Hydrogen, Propane and Natural Gas injectors are also available for gaseous applications. |
This probably is of no consequence Joe, but IIRC Champ Car injectors are a "jet" type (spray a jet of liquid rather than a fan/mist like most injectors).
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Thread ressurrection....
Did anyone ever find a high speed valve other than the Aquamist? I really want a high-speed valve for my WI setup, but just hate the idea of paying that much for a valve that MUST have a cheaper alternative somewhere... They still seem to be priced at around $250 each. I want the more precise control that will come compared to PWM control of the motor, and a decent IGBT (SSR) to drive it with the Adaptronic will cost $50-$100 anyway. |
Aquamists HSV is basically a stainless steel injector. The only reason an injector would be bad is it would eventually rust shut. As long as you had cheap injectors it would matter much with a warning system so you could replace it. I've looked on McMaster for similars but none Ive found are PWM. Perhaps a friendly machinist could try their hand at this.
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What about the WON 'Pulsoid' solenoids? They're considered the best in Nitrous because of their ability to be pulsed very quickly, allowing for very smooth progressive control.
noswizard.com |
^^ Materials incompatability in the seat area. From noswizard:
- Matched Hi-tech thermo plastic outlet seat and plunger seal for ZERO wear. Also... * Due to the recent introduction of bio fuels and the greater concentrations of incompatible chemicals in pump fuels and aftermarket octane boosters, we are no longer able to include chemical decomposition of the fuel plunger seal in our lifetime warranty terms. From now on any such failures (which often take years to develop), will be treated as the Pulsoid being in need of a service and will be charged for accordingly. All petrochemical companies keep the ingredients they use in their products as secret as possible and change those ingredients and the percentages thereof on a regular basis throughout the year, with regional variations also common. The most reliable sealing materials for use with fuels in general are a number of variations on rubber but there is no single material that has a lifelong resistance to all the chemicals currently being used. We recommend that the fuel Pulsoid be inspected for chemical decomposition ever 6 months and if the system is not in use, then it should be drained and blanked off until required. As a special dispensation, we are offering to inspect and reassemble (only) all fuel Pulsoids less than 2 years old at half the normal cost but any Pulsoid found in need of a new plunger seal will be charged in full. |
I dn't know if it is exactly what you are looking for, but Labonte has some clippard valves that are PWM. I ordered some because they were cheaper than regular solenoids. I will let you know how they work for me.
Meth Solenoid that is PWM safe. - evolutionm.net |
dude i like those what is the fitting size etc as they come supplied i was alil skeptical when i saw the flow rate of like .6 scfm but then i did the conversion and if the shit flows half that well on water meth it would rock lemme know how it turns out im interested.
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it's a 1/4 push to connect. Labonte said they will flow less than normal solenoids, but I will be using it for an m0.5 nozzle pre-turbo, so I won't know the difference.
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sounds awesome man i realy think this is a good solution to people not wanting to run a simple system, and bring us alot more adjustability.
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Standing by to see how it works for you. Fingers crossed.
Funny that Labonte does not advertise it as a PWM solenoid though the evo thread (?) indicates that it is. I think Labonte just uses it as an on-off only, in place of a check valve, to reduce back pressure. Their high-end 3D map controller still uses PWM on the pump motor judging by their diagram. |
Originally Posted by ZX-Tex
(Post 445041)
^^ Materials incompatability in the seat area. From noswizard:
Depending on what plastic they use, that is a no-go Also... ill ask him about it next time were in touch |
Yeah if you can find out the seal material. I think for polymers Santoprene is one of the best for water/meth, but others may be OK, they will just swell (absorb fluid) and/or degrade slowly.
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