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DTR - Project Recommission 1972 'Dolomite' Manual http://forum.triumphdolomite.co.uk/viewtopic.php?t=32879 |
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Author: | soe8m [ Mon Jul 09, 2018 8:23 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote:
So a 5 is too hot, and a 7 too cold, a 6 should be just right, (couldn't help it)
Avoid the R. These have 5 KOhm internal resistance I believe. Your 123 has also a 5 KOhm in the rotorarm. Using resistant less leads you will be ok but when they are of the carbon core type you can end up too much.Saying that my car seems to prefer NGK BPR6EFIX10 Iridiums over standard. Jeroen |
Author: | Mahesh [ Mon Jul 09, 2018 8:26 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote: Quote:
So a 5 is too hot, and a 7 too cold, a 6 should be just right, (couldn't help it)
Avoid the R. These have 5 KOhm internal resistance I believe. Your 123 has also a 5 KOhm in the rotorarm. Using resistant less leads you will be ok but when they are of the carbon core type you can end up too much.Saying that my car seems to prefer NGK BPR6EFIX10 Iridiums over standard. Jeroen |
Author: | soe8m [ Mon Jul 09, 2018 8:35 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote: Quote: Quote:
So a 5 is too hot, and a 7 too cold, a 6 should be just right, (couldn't help it)
Avoid the R. These have 5 KOhm internal resistance I believe. Your 123 has also a 5 KOhm in the rotorarm. Using resistant less leads you will be ok but when they are of the carbon core type you can end up too much.Saying that my car seems to prefer NGK BPR6EFIX10 Iridiums over standard. Jeroen Jeroen |
Author: | MIG Wielder [ Tue Jul 10, 2018 6:12 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote:
Thanks Steve!
Hi James, I have updated my original thread on Original temperature senders.Alun has mentioned that hes not too happy with the temp readings given the size of the new rad. This morning I tested the voltage stabalizer and it reads a solid 9.8 volts output. I have sourced a NOS Smiths one which I will test for comparison. As for the temperature sender, it is a new one from Robsport. I have also been able to source a new old stock correct Smiths one from eBay (for NWL actually!) so when it arrives will be able to do a comparison. Tony will have to tell me how to do that!! viewtopic.php?f=6&t=29903&p=280196#p280196 The item I did for the mag; all those years ( as we talked about ) is a big file at about 1Mb . I'll see if I can shrink the images or use multiple PMs. Tony. |
Author: | James467 [ Tue Jul 10, 2018 8:11 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote: I am unconvinced that the problem is solved.
I haven't tried the old temp sender yet and tested the temp gauge so one step at a time.Quote: If it was me, I would be trying fitting a header tank. Previously we disagreed on where to locate one,
Trouble is Ian, not trying to be belligerent but I don't see how a header tank would help with cooling issues. The temp doesn't rise past 3/4, Tony runs Evans and he has the same temp reading, a header tank would only help in a situation of coolant loss, which I have none. Yes it's a good mod but in this case it should run fine as standard.but I will stubbornly stand by my opinion on this because I tested the positioning using coolant as the level indicator. Quote: Magnacor leads ?
Yep, and they are blue!!
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Author: | Mahesh [ Tue Jul 10, 2018 8:24 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
James, next time you have the car warmed up and the electric fan on, put your hand in front of the temp sender and you will see what I was writing about on my thread, intense heat from the radiator forced by the electric fan. I know my temp gauge reads just over because of it. |
Author: | dollyman [ Tue Jul 10, 2018 10:20 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
So in theory, if you could make a shroud for the temp sensor it would give a more accurate reading? Tony. |
Author: | soe8m [ Tue Jul 10, 2018 10:25 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote:
So in theory, if you could make a shroud for the temp sensor it would give a more accurate reading?
I have a watercooled temp sensor. Will post a pic sometime. Tony. Jeroen |
Author: | dollyman [ Tue Jul 10, 2018 10:37 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote: Quote:
So in theory, if you could make a shroud for the temp sensor it would give a more accurate reading?
I have a watercooled temp sensor. Will post a pic sometime. Tony. Jeroen Tony. |
Author: | Carledo [ Tue Jul 10, 2018 11:49 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
I'm in the middle of recomissioning Richphy's Sprint at the moment, it's all running but the Kenlowe is not fitted yet and so there is no fan at all. During warmup, even before the stat has opened, the area of the (Weber) inlet manifold around the temp sender becomes untouchably hot. I'm not convinced that some sort of heatshield to protect it from fan air will do much! The stat opens just a gnats below normal temp on the guage as reported by the new (Fitchetts supplied) sender. whereupon the temp drops a degree or two then starts to climb again. Once it gets past centre, i switch it off as I have no intention of even remotely cooking the motor! But the Kenlowe should go on tomorrow and all should then be OK. Steve |
Author: | sprint95m [ Wed Jul 11, 2018 9:55 am ] |
Post subject: | Okay........ |
Quote: Quote: I am unconvinced that the problem is solved.
I haven't tried the old temp sender yet and tested the temp gauge so one step at a time.Quote: If it was me, I would be trying fitting a header tank. Previously we disagreed on where to locate one,
Trouble is Ian, not trying to be belligerent but I don't see how a header tank would help with cooling issues. The temp doesn't rise past 3/4, Tony runs Evans and he has the same temp reading, a header tank would only help in a situation of coolant loss, which I have none. Yes it's a good mod but in this case it should run fine as standard.
but I will stubbornly stand by my opinion on this because I tested the positioning using coolant as the level indicator. Re. header tanks, these have been used since the 70s including by BL. To begin with these were largely plumbed into the top of the radiator but this method was soon revised to the now standard plumbing into the bottom hose/bottom of radiator. The purpose of the header tank is to prevent cavitation by ensuring that the water pump has a constant uninterrupted supply. Avoiding cavitation ensures that the coolant is in contact with all the surface of the engine, thereby making heat transfer efficient. Slant four engines are prone to cavitation at the back (hence their inclination to blow head gaskets between cylinders three and four). Triumph twice revised water pump impeller design and Saab offer a fourth variation and both went for a header tank (TR7). (Saab completely redesigned the water pump twice, the second of these being a long lasting effective external design 900). In order for a header tank to be it's most effective it should be located as high as possible. Re. Tony's experience with Evans coolant, he is using Classic Cool 180. This is not suitable for Dolomites. It should be Power Cool 180. Tony contacted Evans and they confirmed this. I used PC180 in my old Dolomite 1850. It ran at halfway on the gauge all year round using an 88 degree thermostat, which is the same reading as when I was using water/antifreeze. Evans Coolant has a lower heat transfer coefficient than water but this is offset by EC staying in contact with all surfaces. The so called expansion tank that Triumph employed is the weakest link within the cooling system. Jod Clark wrote an article for Dolly Mixture describing how he cured an overheating 1500SE by replacing it's tank. Using Evans Coolant will mask this weakness because it doesn't pressurise the cooling system. If I could only make one change it would be to fit a header tank. Evans coolant would be my second change. Hope this clarifies things. Ian. |
Author: | James467 [ Wed Jul 11, 2018 10:15 am ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote: The stat opens just a gnats below normal temp on the guage as reported by the new (Fitchetts supplied) sender. whereupon the temp drops a degree or two then starts to climb again.
That's exactly what mine does Steve, driving around this morning the fan cuts in and out nicely and the temp is around 1/2 way. Once I have tested the gauge and new sender I'll set the fan to come in hotter.I am not worried about it any more, it uses no water or oil. I'd like to test the sender and gauge as per Tony's instructions just to entertain myself. |
Author: | Galileo [ Wed Jul 11, 2018 2:44 pm ] |
Post subject: | Re: DTR - Project Recommission 1972 'Dolomite' Manual |
Quote: Quote:
So in theory, if you could make a shroud for the temp sensor it would give a more accurate reading?
I have a watercooled temp sensor. Will post a pic sometime. Tony. Jeroen |
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