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Can Someone PLEASE Provide A Recommendation For A Plunger S

 
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billhuntersemail(at)gmail
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PostPosted: Thu Jun 08, 2017 6:23 pm    Post subject: Can Someone PLEASE Provide A Recommendation For A Plunger S Reply with quote

Greetings,

I have built a fiberglass air filter box that has an automatic alternate air door that I want to monitor with a micro switch and I was hoping someone could please give me a recommendation for a micro switch to purchase.

The construction of this air filter box is of ˝ inch Divinycell foam board encapsulated with two layers of fiberglass (see attached photo) and the alternate air door is a simple fiberglass flapper valve that is held shut by the spring action of the fiberglass valve and two magnets.

The design goal is that the flapper valve will shut when the engine is not running and then after the engine is started the spring action and the magnets will hold the flapper valve shut. At times when the air filter becomes clogged (ice or debris) the engine vacuum will pull on the flapper door with enough suction force that the magnets will separate and the door will open into the air box and allow unfiltered air from the engine compartment to flow to the engine. The magnets are encapsulated in the fiberglass of the door and the air box walls so there is not fear of them falling into the engine.

So…getting back to the switch…it needs to have the following attributes:

-Plunger type switch that has a very light spring that forces the switch plunger to the extended position.
-When the switch is pushed in the contacts need to be open and when the switch is allowed to extend the contacts need to close so my indicator light will illuminate.
-The threaded shaft of the switch should be about ˝ inch long.
-Threaded shaft is made of plastic

My goal is to install the switch from the outside so that the switch body is on the outside of the box and only the plunger assembly is inserted into the sidewall mounting hole just long enough so that the switch will be pressed in when the flapper valve is closed. If the threaded shaft is plastic then I can use epoxy to glue the switch threads into the sidewall of the air box and therefore it would not need a nut on the inside wall of the air box so there would be no worry about the nut falling into the engine intake.

Here is a picture of a switch that could work…I would not use the nuts and I would also prefer that the body and the plunger were made of  plastic and I have no way of knowing how strong the spring is.


[img]cid:image003.jpg(at)01D2E08C.A0080890[/img]

If anyone has a suggestion as to the specific switch I should use I would be most grateful for the advice!!!
..

Cheers!!!

Bill Hunter


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