robby
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Post by robby on Jan 14, 2013 12:41:06 GMT
If you have a VAMO with the end cap getting warm/hot would you be willing to try something. All you need is a bit of fine abrasive paper. Then clean the spring at the contact areas of the spring, ie, at the top of the spring and the bottom at the point where it contacts the end cap. Give both areas a good rub with the abrasive paper, I used wet and dry, works great. Then try your VAMO again and see if the problem is still the same. If you have a multimeter you could record the reading before and after cleaning. You dont need to clean the whole spring, it wont make any positive difference if you do, just the contact area. You will need to read the resistance at the same point on the spring that you cleaned with the abrasive paper. It more or less stops the wandering reading you get when you try to measure the resistance of spring metal. I dont have the big spring to do the job on, but I have done it on the smaller springs which made a difference. It could be that there is oxidisation on the springs causing poor contact. Oxidation is something we use here in a positive way on our stainless steel wicks to create a layer of insulation. It`s worth a try. If you have already got or purchased the new springs and not thrown away the old one then there would be nothing lost to clean the old spring in this way, not that there will be anyway. You could probably even do it with a Brillo pad or similar. The amount of oxidation needed to create the problem that we have may not even be visible to the naked eye. Thanks
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robby
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Post by robby on Jan 14, 2013 13:54:10 GMT
By the way, when you do this, it makes the meter reading much steadier which tends to support the theory.
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robby
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Post by robby on Jan 14, 2013 14:09:09 GMT
Another thing that helps considerably when taking a reading on these springs is to rub bit of Vaseline over the top and bottom of the spring at the contact point. You dont need a lot, you dont even need to use so much that you can see it, but it makes a big difference when taking a reading. It will have the side effect of keeping the contact area cleaner as well. How much difference it could make on it`s own, I dont know as I dont have the big faulty spring. Be interesting to find out though.
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Greigster
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Post by Greigster on Jan 14, 2013 14:14:58 GMT
Just tried it on the tiny original spring and I have .1ohm resistance both before and after the cleaning with wet & dry, but then I have never had a problem with warm cap or power turning off. This is the chrome version
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robby
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Post by robby on Jan 14, 2013 14:39:58 GMT
Just tried it on the tiny original spring and I have .1ohm resistance both before and after the cleaning with wet & dry, but then I have never had a problem with warm cap or power turning off. This is the chrome version Yes, that`s what I got, and it certainly stops the meter reading wandering about as much as before, which suggests maybe oxidation on the spring. .1V is fine, not an issue at all and totally understandable with spring metal.
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deesigner
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Post by deesigner on Jan 14, 2013 14:44:11 GMT
The problem I had with the spring, wasn't that it was getting hot, it was if I moved the Vamo up and down too much it went off, the battery wasn't in tight enough
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robby
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Post by robby on Jan 14, 2013 14:49:08 GMT
The problem I had with the spring, wasn't that it was getting hot, it was if I moved the Vamo up and down too much it went off, the battery wasn't in tight enough I had the same problem, I just stretched mine a bit and havent had that issue again since.
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Gordy
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Post by Gordy on Jan 14, 2013 15:02:20 GMT
Another thing that helps considerably when taking a reading on these springs is to rub bit of Vaseline over the top and bottom of the spring at the contact point. You dont need a lot, you dont even need to use so much that you can see it, but it makes a big difference when taking a reading. It will have the side effect of keeping the contact area cleaner as well. How much difference it could make on it`s own, I dont know as I dont have the big faulty spring. Be interesting to find out though. i understand the idea of cleaning the spring contact area but DONT put vaseline on the contact areas.... Vaseline is NOT electrically conductive and will reduce the electrical contact
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robby
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Post by robby on Jan 14, 2013 15:05:06 GMT
Another thing that helps considerably when taking a reading on these springs is to rub bit of Vaseline over the top and bottom of the spring at the contact point. You dont need a lot, you dont even need to use so much that you can see it, but it makes a big difference when taking a reading. It will have the side effect of keeping the contact area cleaner as well. How much difference it could make on it`s own, I dont know as I dont have the big faulty spring. Be interesting to find out though. i understand the idea of cleaning the spring contact area but DONT put vaseline on the contact areas.... Vaseline is NOT electrically conductive and will reduce the electrical contact We used this extensively to clean relay and switch contacts in the days when transistors were just starting to get a hold. It is petroleum jelly and will keep the contacts clean.
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Skwoddy
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Post by Skwoddy on Jan 14, 2013 15:08:29 GMT
Its all about voltage drop, the more barriers you have between the battery and the coil reduce performance, this includes Noalox and Vaseline, Dry & clean is the best way.
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robby
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Post by robby on Jan 14, 2013 15:12:50 GMT
Its all about voltage drop, the more barriers you have between the battery and the coil reduce performance, this includes Noalox and Vaseline, Dry & clean is the best way. Like I said, we used this a lot in the 70`s and 80`s as a part of preventative maintenance routines specified by manufacturers, they arent barriers, at the point of contact the vaseline moves away to leave a nice clean surface. I am not bullshitting here. It also helps considerably when trying to take the resistance reading of the spring, try it.
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Skwoddy
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Post by Skwoddy on Jan 14, 2013 15:17:00 GMT
Im not saying youre bullshitting robby. Vaseline and the like have their uses in alot of electrical circuits, but when you only have 4.2v to begin with any reduction is noticeable. Probably more noticeable on a Mech mod I agree as the Vamo would compensate but it puts unnecessary demand on the battery. If you have a mech mod to hand check the voltage drop yourself.
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robby
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Post by robby on Jan 14, 2013 15:19:39 GMT
Im not saying youre bullshitting robby. Vaseline and the like have their uses in alot of electrical circuits, but when you only have 4.2v to begin with any reduction is noticeable. Probably more noticeable on a Mech mod I agree as the Vamo would compensate but it puts unnecessary demand on the battery. If you have a mech mod to hand check the voltage drop yourself. I understand what you are saying, but if applying vaseline actually reduces the resistance at point of contact then surely it is reducing the load on the battery.
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Skwoddy
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Post by Skwoddy on Jan 14, 2013 15:25:11 GMT
It reduces the resistance at point of contact but the vaseline stops somewhere and the resistance starts again so more juice has to be drawn through the whole spring to compensate for the vaselines reduction, Im probably gonna end up eating my hat but thats how it sounds to me?
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maccafan
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Post by maccafan on Jan 14, 2013 15:29:36 GMT
Vaseline is used to protect electrical assemblies after contact has been established..For example you can smear vaseline/petroleum jelly over the battery connection assembly of the car battery after you tightened down the terminals and you had a fully connected circuit. The vaseline will keep the moisture out and protect the assembly from corroding.
If you do it before connecting, you'll get little or no electricity flowing through..
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