Jeffds1360 Posted December 25, 2020 Report Share Posted December 25, 2020 Morning and merry xmas everyone. Look what I got from the kids. First photo shows, on the left my old, old water temp sensor which will be 5/8 UNF?? or is it 3/8 BSP? I'm easily confused, some say M12-1.5. What does it all mean....Anyway, the new one is tiny! Can you get adapters? The oil pressure thread size is quoted at 8mm. Is ours 1/8 BSPT? Is a converter available for this too? Maybe I should send it back to China. Nice try my children! 2nd photo is other stuff they got me. Well done for knowing pre '74 can be musical !!! Dare I fit them? They are either Dixie or La Cucaracha!!! No one knows??? Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 25, 2020 Report Share Posted December 25, 2020 air horns can fail the MOT you dont need now as being too harsh Got that tee shirt youre supposed to warn of approach not scare sh1t out of some old lady on the crossing never mind the musical options temp sender is def 5/8unf im sure the oil is 1/8 bsp heres a selection https://www.smiths-instruments.co.uk/temp-transmitters adaptors https://www.carbuilder.com/uk/sender-adaptors Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted December 25, 2020 Report Share Posted December 25, 2020 You should be able to use the old sensors attached to the new gauges, with suitable swapping of connectors or splicing; after all the readings / output should be the same in any language so I doubt if it requires any kind of conversion in between... You can also get an oil pressure sensor converter but again there is probably an entire unit threaded for our cars that may work out just as cheap. Selection of adaptors below: https://www.carbuilder.com/uk/sender-adaptors Link to comment Share on other sites More sharing options...
Graham C Posted December 25, 2020 Report Share Posted December 25, 2020 (edited) Have you tried just attaching the temp gauge to the old sensor to see what happens? The sensor is nothing technical a thermocouple at the bottom of the brass fitting held in place with a spring. You could compare to old gauge and even a thermometer. Graham PS Colin beat me to the reply. Edited December 25, 2020 by Graham C Correction and PS added Link to comment Share on other sites More sharing options...
Jeffds1360 Posted December 25, 2020 Author Report Share Posted December 25, 2020 Aaaah... good. thank you gents. I shall just swap wires on the water and test it out I'm a bit ignorant with regard to the oil sensor, I though the standard one was just 'on/off' as I've never seen the oil light go dim, it just goes straight off on first few cranks. So.... anyway, Ill just swap wires and ignore the new sensors. So what is that big canister all about ? Handy links there Pete, cheers. I will have a separate operating switch for the air horns, for use only in 'exceptional circumstances' e.g. when I'm selling ice cream Thanks to you too Colin (great minds etc re the link) and to you Graham, I will do just that for both Link to comment Share on other sites More sharing options...
KevinR Posted December 25, 2020 Report Share Posted December 25, 2020 The new oil sensor needs to be used with the oil pressure gauge. It contains a pressure to voltage conversion device to drive the gauge. You will also need to provide a supply voltage to the gauge to drive this. mid you also want the oil pressure light to work you will need a T piece so that both the new sensor and the old are getting oil pressure. Link to comment Share on other sites More sharing options...
Jeffds1360 Posted December 25, 2020 Author Report Share Posted December 25, 2020 Gotcha Kevin, thanks. All I have to do now is find out what thread the new sensor is and get the right 'T' piece!! Thank you all again and have a good day........... unless Colin has already had/going to have his... I'm so jealous of your options!!! NOT Link to comment Share on other sites More sharing options...
NonMember Posted December 25, 2020 Report Share Posted December 25, 2020 47 minutes ago, Graham C said: a thermocouple at the bottom of the brass fitting Sorry but the pedant / engineer in me cannot let that pass! The temperature sensor is an NTC Thermistor, it most definitely is not a thermocouple! 51 minutes ago, Colin Lindsay said: after all the readings / output should be the same in any language No, because there's a lot of conversion going on. The temperature sensor converts temperature to resistance, according to a curve that varies widely between sensors. The gauge supply (with or without stabiliser) then converts this resistance to a current, and the gauge converts the current to motion, again with considerable variability. If you had a capillary oil gauge then the fittings don't matter, but if it's an electric one you again have a conversion from pressure to voltage (or resistance) with wide scope for variability. So all in, the senders and gauges must be matched or you will get wild readings. Link to comment Share on other sites More sharing options...
Graham C Posted December 25, 2020 Report Share Posted December 25, 2020 Sorry Non member, you are correct, I forgot. I can remember building them at Speedograph Arnold Nottingham when I was a student. Amazed how simple they were. Graham Link to comment Share on other sites More sharing options...
Jeffds1360 Posted December 25, 2020 Author Report Share Posted December 25, 2020 Dooooooh ! I'm possibly done then. Trials will tell. Dinners up. gotta go. ATB all Wife just had NHS call. Her mother is positive so 10 days in!! Not me though!! Link to comment Share on other sites More sharing options...
Colin Lindsay Posted December 25, 2020 Report Share Posted December 25, 2020 4 hours ago, NonMember said: No, because there's a lot of conversion going on. The temperature sensor converts temperature to resistance, according to a curve that varies widely between sensors. The gauge supply (with or without stabiliser) then converts this resistance to a current, and the gauge converts the current to motion, again with considerable variability. What I was getting at (the simplistic part) was that 80, 88, 90 degrees or the like should be the same regarding of what you actually call it, so that a gauge registering a certain temperature will register the same temperature the world over and hopefully in the same position on the scale, but you're right in how that is interpreted between the sensor and the gauge. However as a first step I'd try temp and volts with the standard sensor and see how accurate or not that is - it's unlikely to blow anything as the sensor is simply that, and the replacement one looks to be the same, a simple sensor and not a complicated electronic device with any kind of overload or failsafe built in and no huge variation in current. It might be useable as is, but only a test will tell. Link to comment Share on other sites More sharing options...
Jeffds1360 Posted December 25, 2020 Author Report Share Posted December 25, 2020 Ok guys, I'll try a basic existing wire to new Temp gauge tomorrow and see what it reads (my existing one never goes above 1/4 hot) With regard to the oil pressure, I am going to have to measure the new sensor threads and see if it fits/what T piece I need. BTW the horn compressor motor runs but no air out of nozzles!!!................ bit of a bummer Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 25, 2020 Report Share Posted December 25, 2020 the horns do need a heck of a volume of air and the motor needs a heavy supply cable or it will run slow parp poop prap peep pete Link to comment Share on other sites More sharing options...
Jeffds1360 Posted December 25, 2020 Author Report Share Posted December 25, 2020 just reading up about that. My bench test used pretty thin wires. I'll charge up my bench battery and use jump leads tomorrow Link to comment Share on other sites More sharing options...
Jeffds1360 Posted January 1, 2021 Author Report Share Posted January 1, 2021 Happy new year everyone. Can you confirm for me that these oil and water sensors I have, which measure 8mm outside thread size and seem to be 28 PTI (+/- 1) are equivalent to 1/8 BSP.? I understand I may need to use some PTFE tape as the threads may be slightly different shape. Also, who is best supplier for 1) a 1/8 BSP 'T' piece and 2) a 5/8 UNF 'T' piece to 5/8 UNF and 1/8 BSF. If this is available?? Thanks in advance. Link to comment Share on other sites More sharing options...
68vitesse Posted January 1, 2021 Report Share Posted January 1, 2021 I believe that most threads have an angle of sixty degrees the important bit is number of turns for a given length and diameter of thread regardless if it is tapered or parallel. Regards Paul Link to comment Share on other sites More sharing options...
Jeffds1360 Posted January 1, 2021 Author Report Share Posted January 1, 2021 Just realised my Chinese sensors may be M10x1. Is this likely? If so, I need M10x1 female adapters to 5/8 unf and to 1/8 bsp. males They seem available in USA for a fiver but postage is 30+.... weird that I cannot find any in the UK! All mine are, I believe parallel, I'm struggling to count the TPI hence the small variation in my descriptions 27/28 TPI is 0.9/mm 'ish so I must assume 1 thread per mm but eye-site is strained and it is always dark and the grand-kids are not allowed in etc etc Link to comment Share on other sites More sharing options...
SpitFire6 Posted January 3, 2021 Report Share Posted January 3, 2021 I thought oil-pressure sender was 1/8 NPT? Link to comment Share on other sites More sharing options...
Jeffds1360 Posted January 3, 2021 Author Report Share Posted January 3, 2021 Hi. Yes if your in America! BSP has a 55 degree thread angle while NSP is 60 and also has flattened peaks and valleys. I'm sure our good old British cars will be BSP. I need adapters to M10x1. Bloody Chinese Link to comment Share on other sites More sharing options...
SpitFire6 Posted January 3, 2021 Report Share Posted January 3, 2021 19 minutes ago, Jeffds1360 said: Hi. Yes if your in America! BSP has a 55 degree thread angle while NSP is 60 and also has flattened peaks and valleys. I'm sure our good old British cars will be BSP. I need adapters to M10x1. Bloody Chinese I hope the oil galleys on a six are 1/8NPT as just bought some expensive transmitters for data logging. I want the threads to match! LOL. Link to comment Share on other sites More sharing options...
Jeffds1360 Posted January 3, 2021 Author Report Share Posted January 3, 2021 On 25/12/2020 at 11:38, Pete Lewis said: temp sender is def 5/8unf im sude the oil is 1/8 bsp heres a selection https://www.smiths-instruments.co.uk/temp-transmitters adaptors https://www.carbuilder.com/uk/sender-adaptors Pete Pete is 'sude'.....??? 1 Link to comment Share on other sites More sharing options...
NonMember Posted January 3, 2021 Report Share Posted January 3, 2021 1 hour ago, Jeffds1360 said: I'm sure our good old British cars will be BSP. Not on the oil gallery plugs. They are a crazy random mix that definitely includes some NPT, some UNF and probably a BSP somewhere. I'm not sure which the oil light sender hole is. Link to comment Share on other sites More sharing options...
Jeffds1360 Posted January 3, 2021 Author Report Share Posted January 3, 2021 Oh.... rollocks I've ordered adapter for it now. 1/8 BSP to M10x1 ....... have to wait and see. PTFE at the ready I'll let y'all know what's what when. Damn lockdown! Link to comment Share on other sites More sharing options...
Peter Truman Posted January 4, 2021 Report Share Posted January 4, 2021 Remember a lot of senders earth thro their body ie the screw in fitting so don’t put too much pyre on I think the oil pressure sensor is not. Link to comment Share on other sites More sharing options...
Anglefire Posted January 4, 2021 Report Share Posted January 4, 2021 4 hours ago, Peter Truman said: Remember a lot of senders earth thro their body ie the screw in fitting so don’t put too much pyre on I think the oil pressure sensor is not. If there is only one wire then it will require a return path - so via the thread would be normal. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now