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| Ralph Mowery <rmowery28146@earthlink.net>: Oct 29 01:58PM -0400 In article <nv1ukv$mvn$1@remote5bge0.ripco.com>, bje@ripco.com says... > Point is, it would be money more well spent just replacing all that compared > to doing whatever he wanted to do with the scope, which probably isn't going > to tell him anything. I have not had a car with points in it in many years so may be way off on the following. Wasn't the usual thing to change out the points, condenser, plugs and a few other things about every 10,000 miles or so back then ? Seems to me that the 3 or 4 cars I owned with the old nonelectronics in them needed to be worked on all most all the time. I remember replacing a lot of plugs and some points, distributer caps and wires. None of those had over 100,000 miles on them. Now lots of cars go 100,000 without anything but oil changes and tires. |
| Bruce Esquibel <bje@ripco.com>: Oct 30 12:02PM > on the following. > Wasn't the usual thing to change out the points, condenser, plugs and a > few other things about every 10,000 miles or so back then ? Yes. That's really the reason this bit about using some scope to monitor/examine the ignition system is borderline silly. It wouldn't matter if that car was some "barn find" where it's been under a bundle of hay for the past 50 years or a daily driver that someone was using for weekend tours of the countryside, those parts were part of the normal maintance schedule and should be totally replaced on a regular basis. It would be surprising that the engine shouldn't be rebuilt every 25,000 miles as well. Most pre-WW2 cars from the 20's and 30's barely made the 10,000-12,000 mile range before needing a rebuild. Most of those didn't have oil filters, there used to be kits to use rolls of toilet paper as a replaceable cartridge. The post war ones were better but no where near todays standards. Even into the early 60's, getting into the 50~60,000 mile range was "good". Getting up to 100,000 without a major overhaul was exceptional. Something from 1948, if all original, would be a miracle if all it really needed was the ignition system replaced. It's cheap enough to do and see but wouldn't suprise me if the rings were gone, crank out of tolerance or even a lesser job of the cam lobes in the distributor were flat. All the tech available today isn't going to change the need of getting your hands greasy. -bruce bje@ripco.com |
| Jon Elson <elson@pico-systems.com>: Oct 29 03:20PM -0500 >> in their bedroom. It was there when we moved in. The regular switches >> around the house made really loud snaps. >> Nowadays, switches are nearly all virtually silent. The switches we have are almost all cam-operated, not snap-action. A bump on the handle presses a contact arm onto the other contact. These fail generally by fatigue of the arm, not by burning out of the contacts. They do seem to last 20++ years in residential use. Most of the ones I've replaced are most likely the original ones installed when the house was built, 40 years ago. Jon |
| Jon Elson <elson@pico-systems.com>: Oct 29 03:16PM -0500 > Thanks for the motor update. I have been thinking about that motor and > why they would use it and it must be because shaded pole motors are so > inefficient. Right, it has to be fairly efficient as there is no fan. Since the rotor is in a sealed plastic housing, there is no external shaft to connect a fan to. That's probably why they cycle the pump on and off during drain/spin cycles. I guess the permanent magnet rotor is way more efficient than an induction rotor, too. The only tricky part is assuring the motor starts every time you apply power. Jon |
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