21 replies to this topic

[DUF2]

I want to fit a 50mm tacho into the dash on my 1275 engined Elf. I thought all I needed to do was to fit a Smiths dual gauge to retain water temp & oil pressure leaving a space for the tacho.
I have encountered a problem. The bulb on the temperature sensor is too long and is catching of the inside of the head, preventing me from tightening the securing nut. The sensor is catching on the casting for the head bolts that is not fitted on my engine.
Anyone know a way around this, or an alternative to the Smiths dual gauge with the mechanical water temp sensor?

[unburntfuelinthemorning]

Have you used an adapter?  I had to buy mine separately to the gauge.

 

http://www.minispare...30.aspx|Back to

[DUF2]

Have you used an adapter?  I had to buy mine separately to the gauge.
 
http://www.minispare...30.aspx|Back to

You are correct, I just tried to screw the sensor into the head, this spacer makes sense.

[DUF2]

Perhaps the other question I should have asked is
Has anyone converted a dual gauge from capillary to electric water temp?

[unburntfuelinthemorning]

Maybe they have.  Just go with the capillary tube - not as easy to fit but very accurate.

[nicklouse]

Perhaps the other question I should have asked is
Has anyone converted a dual gauge from capillary to electric water temp?

why on earth would you if you can find a dual one electric for both use that as the capillary ones are more accurate and period ones are getting hard to get now. 

[DUF2]

Maybe they have.  Just go with the capillary tube - not as easy to fit but very accurate.

Not that accurate, when I test the one I have with boiling water, it registers halfway between the N & the H, just where the bar the needle sweeps over goes solid. I know the boiling point is higher when under the pressure of the 15psi cap, but I did think the needle would have been a touch higher at 100C

[DUF2]

Perhaps the other question I should have asked is
Has anyone converted a dual gauge from capillary to electric water temp?

why on earth would you if you can find a dual one electric for both use that as the capillary ones are more accurate and period ones are getting hard to get now.

Nicklouse they are still available for around £100.
I bought a one off eBay with the capillary missing, thought it would not be too expensive to replace. When I checked with instrument manufacturers they reckoned the cost of repair was very similar to the cost of a new gauge!
I have since bought a working gauge via eBay for £50, but I feel the gauge under reads, the needle only goes halfway between N & H when the sensor is in boiling water 100C. I know the temp of the boiling point is higher when under pressure.

Edited by DUF2, 17 July 2018 - 07:10 PM.

[Dusky]

Temp isnt higher under pressure.
Your engine should run +-88℃. So you know it should be a tad under the halfway mark.

[Spider]

 

Perhaps the other question I should have asked is
Has anyone converted a dual gauge from capillary to electric water temp?

why on earth would you if you can find a dual one electric for both use that as the capillary ones are more accurate and period ones are getting hard to get now. 

 

 

Respectfully Nick, I don't think any of us need to read down to +/- 1 degree with them, all we really need is repeatability of the gauge and in this aspect, I've found them every bit as good as capillary gauges.

 

The elect gauges well show what's 'normal' and what's not.

[DUF2]

Temp isnt higher under pressure.
Your engine should run +-88℃. So you know it should be a tad under the halfway mark.

Temperature is not higher under pressure, but the boiling point is. The higher the pressure the higher the boiling point, so you can have an engine running at say 110C without the water boiling due to the boiling point being higher due to the pressure of the pressure cap.
The pressure comes from the expansion of the water as it becomes heated.
Water expands by 23% when it is heated from around 50F to 180F or thereabouts! Can't remember the exact figures it is a long time ago that I was at college studying as an apprentice heating engineer!!!

[Dusky]

Temp isnt higher under pressure.
Your engine should run +-88℃. So you know it should be a tad under the halfway mark.

Temperature is not higher under pressure, but the boiling point is. The higher the pressure the higher the boiling point, so you can have an engine running at say 110C without the water boiling due to the boiling point being higher due to the pressure of the pressure cap.
The pressure comes from the expansion of the water as it becomes heated.
Water expands by 23% when it is heated from around 50F to 180F or thereabouts! Can't remember the exact figures it is a long time ago that I was at college studying as an apprentice heating engineer!!!

Ofcourse. Again, why I said temp isnt higher. See youve edited your mistake.

[gazza82]

 

 

Perhaps the other question I should have asked is
Has anyone converted a dual gauge from capillary to electric water temp?

why on earth would you if you can find a dual one electric for both use that as the capillary ones are more accurate and period ones are getting hard to get now.

Nicklouse they are still available for around £100.
I bought a one off eBay with the capillary missing, thought it would not be too expensive to replace. When I checked with instrument manufacturers they reckoned the cost of repair was very similar to the cost of a new gauge!
I have since bought a working gauge via eBay for £50, but I feel the gauge under reads, the needle only goes halfway between N & H when the sensor is in boiling water 100C. I know the temp of the boiling point is higher when under pressure.

 

 

 

Is it the right sensor for the gauge?

 

Brand new capillary type gauges are only about £110-120 ..

[Ol timer]

Hate to. Hijack this thread however I have the smiths dual gauge and now the temp gauge is not Working. I suspect the capillary line to be faulty.
I cannot find one online. Anyone know where I can get one

[nicklouse]

Hate to. Hijack this thread however I have the smiths dual gauge and now the temp gauge is not Working. I suspect the capillary line to be faulty.
I cannot find one online. Anyone know where I can get one

you cant, the whole unit needs sending away for recharging and sealing.