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Jul 11, 2020 13:06:49 GMT
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Can you show hoe you do that please Phil? In this case the fix is going to be particularly dull. I had set the gauge up to this sender when I re-wound the coils, and it was pretty accurate. However, that was set by putting it on the 12V lead acid battery on my bench, which is going to have probably been a stable 11.7v or thereabouts. With the battery charging and the system running at 14.4v in the car, it over-reads, so my simple fix will be to get a voltage regulator for the gauge and adjust it to 11.7v so the gauge reads accurately all the time. Phil
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Jul 11, 2020 18:33:08 GMT
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Just read all 98 pages all I can say is thank you for the education and WOW!.
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Jul 11, 2020 18:35:24 GMT
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How much work would it be to rewind it again? Would be nicer than adding a voltage regulator.
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Jul 11, 2020 18:51:09 GMT
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How much work would it be to rewind it again? Would be nicer than adding a voltage regulator. It's wound just fine; problem is the thing is really sensitive to voltage changes. With the engine off it reads accurately; start it up and get the alternator interested and it reads that much over. Voltage regulator is the only way to go on this case, driving the car is so variable in voltage there's no point adjusting it for 14.4v, instead run a stabilizer at 11.5v and have done with. Phil
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Last Edit: Jul 11, 2020 19:28:43 GMT by PhilA
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Jul 11, 2020 18:52:47 GMT
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How much work would it be to rewind it again? Would be nicer than adding a voltage regulator. It's wound just fine; problem is the thing is really sensitive to voltage changes. With the engine of it reads accurately; start it up and get the alternator interested and it reads that much over. Voltage regulator is the only way to go on this case, driving the car is so variable in comrade there's no point adjusting it for 14.4v, instead run a stabilizer at 11.5v and have done with. Phil True, has the added benefit of removing any variation due to charging differences etc.
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remmoc
Part of things
Posts: 919
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Jul 12, 2020 13:49:22 GMT
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Here in the UK - Smiths instruments who supplied most of UKs cars right up until the mid 70s ran all their gauges at 10V on a voltage stabiliser
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Jul 13, 2020 18:33:42 GMT
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Here in the UK - Smiths instruments who supplied most of UKs cars right up until the mid 70s ran all their gauges at 10V on a voltage stabiliser Yeah, for the same reason as this- alternator provides a very sharp charge/no-charge cutoff at low RPM which is enough to cause havoc with field-wound gauges like this. Most of the Smiths stuff I have encountered has been what I call "bimetallic Bourdon", where a heating coil wrapped around a bimetallic arm attached to a gearset to move the needle causes the needle to move, and this is high enough current that slight variances in voltage wouldn't have a great effect. Their "voltage stabilizer" is a chattering set of points which is fine for a highly damped system such as that but terrible for the oil-damped needles in this system- that would a) be a point source of RF interference and b) cause the gauges to tremble, neither of which are a particularly desirable outcome. So, an infinitely variable bucking regulator will be added and the output set to Vmax of 11.5V - possibly lower depending on how much I can tweak things, to get it to remain stable- reading slightly low at idle is acceptable. Over-reading during normal driving less so. --Phil
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Liberated the driver's side front sash channel. Is that household window putty? Yes, yes it is. Front glass channel is missing, top/rear is bent. Need to get the pieces that are missing, broken and otherwise incorrect. Phil
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Found a vendor of the correct glass channel on eBay, surprisingly.
Phil
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Jul 14, 2020 22:43:50 GMT
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Wire wheel, fire, paint, vice. It's now cleaned, prepped, straighter than it was. Phil
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Jul 17, 2020 19:34:20 GMT
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Forgot I had the parts on the shelf for this, so I made myself an adjustable voltage regulator for the temperature gauge. Phil
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Jul 17, 2020 21:48:22 GMT
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Trimmed down and installed board. Got the engine run up to temperature. Adjusted gauge. That's better. Phil
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Jul 17, 2020 21:58:35 GMT
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voodoo....
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'80 s1 924 turbo..hibernating '80 golf gli cabriolet...doing impression of a skip '97 pug 106 commuter...continuing cheapness making me smile!
firm believer in the k.i.s.s and f.i.s.h principles.
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Jul 17, 2020 22:21:51 GMT
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No, just think of that board as a pressure relief valve. As the input pressure rises, the valve bleeds some off to keep the pressure at the gauge stable, rather than going up and down as the engine is revved. That instability in the supply pressure was making the gauge inaccurate, so now that the supply pressure is stable, the gauge reads properly. Phil
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Jul 17, 2020 22:43:02 GMT
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ill stick with voodoo.. lektriks make my head hurt! ;-)
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'80 s1 924 turbo..hibernating '80 golf gli cabriolet...doing impression of a skip '97 pug 106 commuter...continuing cheapness making me smile!
firm believer in the k.i.s.s and f.i.s.h principles.
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Jul 18, 2020 22:12:02 GMT
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I took the dash out again. Reason being the temperature gauge was getting stuck in the middle of its travel and I would have to thump the dash to get it to settle to the correct position. It would get stuck around this position, which wasn't good. I took it out it the bucket and checked it- it moved fine. Tightening it down caused it to twist slightly and bind. I set it in the bucket and adjusted the armature slightly to account for this and now it moves freely. Lubricated the moving parts with light clingy oil. Also set the oil pressure gauge to sit correctly on zero with no pressure. It's not really accurate on the rest of the scale, but zero might as well be. I'll loom up the rest of the wiring that I couldn't reach being as I have access with the gauges removed, then reassemble it all. Phil
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Idle idle idle Normal running temperature. Bang on the money. Now I'm too hot, smell of old idling car but with that job finished and hopefully done with. Phil
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Jul 19, 2020 13:52:54 GMT
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Wurlitzer styling. Beautiful.
Jhn
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Jul 19, 2020 15:41:23 GMT
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Wurlitzer styling. Beautiful. Jhn Just needs bubbles going up round by the numbers. Phil
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