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Temp sensor in 1/8 NPT impossible!?
 Moderated by: MaDMaXX, Mike69, NoPower Page:    1  2  3  Next Page Last Page  
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 Posted: Tue Nov 14th, 2017 03:43 am
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MaDMaXX

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So i'm doing the EFan mod, i'm trying to get the radiator hose adaptor to fit a temperature sensor switch, all the pipe adaptors are 1/8th NPT yet the sensors are all 3/8 NPT!!

What the heck, am i missing something here?



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 Posted: Tue Nov 14th, 2017 03:58 am
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"The most common switch used is the BMW dual temperature switch:

Switch #1 = BMW 80 / 88* C (180/195*F) dual temp switch P/N 61318361787

Switch #2 = BMW 91 / 99* C (195/210*F) dual temp switch P/N 61311378073

These temperature switches have a M14 x1.5 thread.

14mm x 1.5 to 3/8" Brass Adapter:

Hollister Road offered a brass adapter so you can install this metric threaded switch in to a 3/8" temperature sensor fitting.

This is a brass adaptor for the BMW dual temperature switch and similar fan switches that have 14mm x 1.5 x 14mm deep thread. It turns the 14mm x 1.5 thread into a low profile 3/8" standard American pipe thread and lets you use a the dual temperature switches in one port on a non metric American intake manifold drilled for 3/8" pipe thread."



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 Posted: Tue Nov 14th, 2017 05:12 am
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MaDMaXX

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The adaptors are all 1/8 though.



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 Posted: Tue Nov 14th, 2017 05:17 am
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TheArcticWolf1911
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The thing you're finding is the reason why the coupler is still in my toolbox and not on my truck. I looked at several places and couldn't find anything.

If you absolutely insist on using the, admittedly, nicer looking anodized adapter rather than making one like I did, modify the premade adapter. Drill 'er out, then tap it for the 3/8ths sensor. You'll have to add a new grounding screw hole as you'll wind up going through the original one, but that in it of itself is dirt simple.



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 Posted: Tue Nov 14th, 2017 05:29 am
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MaDMaXX

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I was trying not to have to get my Brother to braze in an adaptor to some copper pipe i'll have to go find/buy, but it's really looking like i'll need to.

I've got a switch arriving tomorrow 3/8th, it'll work, but the adaptor is the weirdest thing, what on earth are people fitting to them.

Having said that, there is one on ebay, looks like a home made special, but it does have a 3/8th in it, albeit for $30.



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 Posted: Tue Nov 14th, 2017 02:43 pm
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brazing is overkill for something made of copper and brass. All you need is plumbing solder and a torch.



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 Posted: Tue Nov 14th, 2017 05:02 pm
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JAMMAN

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Gosh someone got a picture of this think I run a machine shop.



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 Posted: Tue Nov 14th, 2017 07:30 pm
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MaDMaXX

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@Jamman - it's literally a few inches of 38mm/1.5inch diameter piping with a 3/8th NPT screw adaptor half way along it.





Last edited on Tue Nov 14th, 2017 07:32 pm by MaDMaXX



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 Posted: Tue Nov 14th, 2017 07:33 pm
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MaDMaXX

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TheArcticWolf1911 wrote: brazing is overkill for something made of copper and brass. All you need is plumbing solder and a torch.



I was considering we're under pressure and wasn't sure if that would be enough.



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 Posted: Tue Nov 14th, 2017 07:59 pm
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What is the diameter of the hose inlets.

Can someone just send me one? I can make a dozen or so. Brass if you want, stainless, whatever.



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 Posted: Tue Nov 14th, 2017 08:01 pm
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And a ground screw :)

OK 38MM dia, nubs to keep tube on, 1/4 NTP hole?



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 Posted: Tue Nov 14th, 2017 08:06 pm
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@MaXX: the water pipes in your house are soldered fittings and they can have anywhere from 20 to 60 lbs. of water pressure on them.  Your cooling system only generates between 7 and 15 lbs. of pressure.



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 Posted: Tue Nov 14th, 2017 10:38 pm
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MaDMaXX

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Listed spec in my pictures post - 38mm or 1.5 inches, threaded hole in 3/8th NPT.


Per the pics, basic rib for retention and jubilee clips.


Oh and yeah the grounding post, most sensor switches seem to be single pole.



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 Posted: Tue Nov 14th, 2017 10:38 pm
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MaDMaXX

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Good to know.



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 Posted: Wed Nov 15th, 2017 05:46 pm
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MaDMaXX

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Jamman, how much would you be able to do these for?



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 Posted: Wed Nov 15th, 2017 07:16 pm
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Depending on quantity and material.

I have bronze, copper, CRS and aluminum in stock. I don't have any stainless that diameter.

Aluminum would turn to crap, CRS would rust, bronze would be about the best IMO but stainless is king.

I bet china is selling those for like 5 bucks LOL.



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 Posted: Wed Nov 15th, 2017 07:19 pm
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MaDMaXX

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You can buy one even on Amazon for $10-15 delivered, alloy, but threading is 1/8 instead of the 3/8 we need.


Copper might be best for something in the cooling system? But if you don't already have that, and of course, i only want/need one of these :)

I don't know what those other metals are like for conductivity, for the single connector temp switch, you need to ground a wire through the housing, hence the screw hole.



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 Posted: Wed Nov 15th, 2017 07:54 pm
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How does grounding it do any good when it is insulated on both sides by rubber hose? Or is it a ground wire you are hooking to the tube because the sensor is single wire?



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 Posted: Wed Nov 15th, 2017 08:08 pm
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MaDMaXX

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Yes, ground wire.



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 Posted: Thu Nov 16th, 2017 07:01 am
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All of the sensor adapters are generally made of brass..



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 Posted: Wed Nov 29th, 2017 03:56 pm
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MaDMaXX

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Jamman, do you think you could make one of these then?



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 Posted: Wed Nov 29th, 2017 03:58 pm
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Funny I just got the brass in today. I'm leaving in a few minutes but I'll check the machine schedules and see when I can run it.



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 Posted: Wed Nov 29th, 2017 04:05 pm
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MaDMaXX

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:rock



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 Posted: Wed Nov 29th, 2017 05:12 pm
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Proof:





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 Posted: Wed Nov 29th, 2017 05:15 pm
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MaDMaXX

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Sheesh, i know pipes have to come from solid, but so much waste! :(



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