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Message started by Armen on 09/19/16 at 18:48:55

Title: Oil temp sender
Post by Armen on 09/19/16 at 18:48:55

Took the hint about the oil galley blanking plug on the lower right side of the motor. 14x1.25 thread.
Had a slug of hex aluminum around.
Bought a VDO oil temp sender.
Sender has 1/8" NPT pipe thread.
A bit of drilling, tapping, machining, cutting threads, and Voila!
Using BMW crush washers because they are real narrow, and won't stick out on the sides :)
Next gag is to convince the LED fuel bar gauge on the new speedo that the resistance it is reading is 'Fuel level" not something crazy like 'oil temp'.

Title: Re: Oil temp sender
Post by Armen on 09/19/16 at 18:49:59

Did I miss the pic in the first post?

Title: Re: Oil temp sender
Post by SavageMan99 on 09/20/16 at 09:00:45

Was, no JB Weld?

Title: Re: Oil temp sender
Post by Kris01 on 09/20/16 at 19:27:43

Does the oil pressure sender use the same range of resistance as a fuel gauge?

Title: Re: Oil temp sender
Post by Armen on 09/21/16 at 02:48:55

Hey Kris,
The gauge is a Koso speedo/tach/everything with a 6 bar LED fuel gauge. You have a choice of resistance ranges to use, depending on what your fuel level sender does. IIRC, there are 100, 250, 510, and 1200 ohm ranges.
The oil temp sender is a 0-300 degree unit.
My thought was to connect everything up and try the different resistance ranges until I find the one that puts the LEDs in the most useful range.
Hopefully I won't be seeing 300F, so it'd be nice if the gag maxed out at less than that.
I guess I could throw the sender in a pot of boiling water with a meter attached, and monitor the water temp with my IR meter and take lots of notes.
Or I could just put it on and try the different resistance ranges.
8-)

Title: Re: Oil temp sender
Post by verslagen1 on 09/21/16 at 07:18:01

not gag... gage or gauge.

You should try it with a voltmeter 1st.
temperature probes are usually bimetallic... and put out voltage.
you don't want to screw up your gage.

Title: Re: Oil temp sender
Post by Armen on 09/21/16 at 07:20:34

From Dakota Digital (another maker of gauges)

300F
1000 ohms @72 F
150 ohms @160 F
100 ohms @ 183 F
75 ohms @ 200 F
50 ohms @ 226 F
20 ohms @ 296 F

400F
2,500 ohms @ 72 F
150 ohms @ 212 F
75 ohms @257-259 F
20 ohms 360 F

Wes Case
Dakota Digital
4510 W 61st St N
Sioux Falls, SD 57107
Phone: 605-332-6513
Fax: 605-339-4106
wes@dakotdigital.com

Title: Re: Oil temp sender
Post by Armen on 09/21/16 at 07:26:42

'Gag' like 'Thing'. Like 'sight gag' or act, or stunt.

Title: Re: Oil temp sender
Post by Kris01 on 09/21/16 at 17:51:07

140710110E0305070C53620 wrote:

temperature probes are usually bimetallic... and put out voltage.

It's technically a thermocouple but most people understand "sender" better.

Title: Re: Oil temp sender
Post by Armen on 09/21/16 at 19:37:57

I think we are talking about two different gizmos here. The VDO cylinder head temp gauge that I ran on my Airhead in the 70's and 80's used a bimetallic ring in place of the spark plug gasket/crush washer. It produced voltage.
The VDO oil temperature sender I have is a different construction. I had an extra (not VDO) sender, and cut it open to look. Def does not look like a bimetallic thermocouple. This type of sender varies resistance with temperature.

Title: Re: Oil temp sender
Post by mjs3790225 on 09/22/16 at 17:16:53

That red thing looks like a thermistor. Probably a Negative Temperature Coefficient one. NTCs have a base resistance at room temperature, but as temperature increases that base resistance decreases.

They come in lots of different values and ranges. You can probably find one that works well for your gauge no problem.

Title: Re: Oil temp sender
Post by Kris01 on 09/22/16 at 19:39:08

I've used mouser.com and digikey.com when I needed something.