The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Aftermarket magneto slip rings
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Magnetoman" data-source="post: 46401" data-attributes="member: 2806"><p>Again, cutting and pasting from BritBike Forum:</p><p></p><p><em><strong>Originally Posted By: Ken Tee</strong></em></p><p><em><strong>I choose a free weekend and leave the component on the slip ring/pick-up tester all weekend, which as it happens is about 60 hours.</strong></em></p><p></p><p>I can conduct a test on only a few capacitors and have high confidence the result is representative of all such capacitors because it is possible to rely on the manufacturers' own tests and specifications. The thing capacitor manufacturers don't normally test for is longevity in the presence of oil vapor, so my tests are directed toward that while also subjecting them to magneto-level current pulses. In contrast, a specialty product like a slip ring produced in very small batches by small companies without the reputation or quality control of a major electronics manufacturer is different. There conducing only one test tells you only about that sole component you have tested. </p><p></p><p>As I wrote in my analysis of the slip ring that failed after only 2000 miles ("60 hours"), those results only applied to that one specific slip ring. </p><p></p><p><a href="http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=507338#Post507338" target="_blank">http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=507338#Post507338</a></p><p></p><p>Before anyone could say a slip ring from a given batch was a "good component" a statistically significant number of them would have to be tested to failure or to at least the equivalent of 20,000 miles. This is what major electronics manufacturers do before selling their products. And, even then, controls would have to be in place at the slip ring manufacturer to ensure batch-to-batch repeatability.</p><p></p><p><em><strong>Originally Posted By: Ken Tee</strong></em></p><p><em><strong>Good luck, Magnetoman, in your quest to find some testing method for predicting future failure of a slip ring without using specialised equipment. Must admit I can't think of any way of doing it. In the meantime, people are going to need to rely on traders' reputations and what they have to say about their wares. A good thing about forums like this is that if somebody is dissatisfied with a magneto spare they've actually bought, or service they've received, they can tell the whole world about it. </strong></em></p><p></p><p>For a number of years one well-known supplier sold replacement condensers with the claim "Modern substitute, very high specification, zero failure." Despite this claim, they failed in service. Still, it took a number of years before enough motorcyclists complained to the supplier about failures for the supplier to cease selling them. In all that time I never saw a single complaint registered on a Forum like this, nor any on-line comments questioning that trader's reputation. This is not surprising given how uncertain most motorcyclists are about electricity. </p><p></p><p>Unfortunately, the long, checkered history of aftermarket electrical components is why it is essential to follow Ronald Reagan's advice and "Trust, but Verify." Trust, to spend the time and money buying a particular aftermarket component in the first place, but Verify to ensure it actually performs as the supplier says it does. Even if 50% of the slip rings from a given batch are bad, it only matters to the buyer if they got one of the good ones. So, the seller needs to do relevant tests on a statistically significant number of components before making claims about them, but the buyer only needs to test the one component they bought.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 46401, member: 2806"] Again, cutting and pasting from BritBike Forum: [I][B]Originally Posted By: Ken Tee I choose a free weekend and leave the component on the slip ring/pick-up tester all weekend, which as it happens is about 60 hours.[/B][/I] I can conduct a test on only a few capacitors and have high confidence the result is representative of all such capacitors because it is possible to rely on the manufacturers' own tests and specifications. The thing capacitor manufacturers don't normally test for is longevity in the presence of oil vapor, so my tests are directed toward that while also subjecting them to magneto-level current pulses. In contrast, a specialty product like a slip ring produced in very small batches by small companies without the reputation or quality control of a major electronics manufacturer is different. There conducing only one test tells you only about that sole component you have tested. As I wrote in my analysis of the slip ring that failed after only 2000 miles ("60 hours"), those results only applied to that one specific slip ring. [url]http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=507338#Post507338[/url] Before anyone could say a slip ring from a given batch was a "good component" a statistically significant number of them would have to be tested to failure or to at least the equivalent of 20,000 miles. This is what major electronics manufacturers do before selling their products. And, even then, controls would have to be in place at the slip ring manufacturer to ensure batch-to-batch repeatability. [I][B]Originally Posted By: Ken Tee Good luck, Magnetoman, in your quest to find some testing method for predicting future failure of a slip ring without using specialised equipment. Must admit I can't think of any way of doing it. In the meantime, people are going to need to rely on traders' reputations and what they have to say about their wares. A good thing about forums like this is that if somebody is dissatisfied with a magneto spare they've actually bought, or service they've received, they can tell the whole world about it. [/B][/I] For a number of years one well-known supplier sold replacement condensers with the claim "Modern substitute, very high specification, zero failure." Despite this claim, they failed in service. Still, it took a number of years before enough motorcyclists complained to the supplier about failures for the supplier to cease selling them. In all that time I never saw a single complaint registered on a Forum like this, nor any on-line comments questioning that trader's reputation. This is not surprising given how uncertain most motorcyclists are about electricity. Unfortunately, the long, checkered history of aftermarket electrical components is why it is essential to follow Ronald Reagan's advice and "Trust, but Verify." Trust, to spend the time and money buying a particular aftermarket component in the first place, but Verify to ensure it actually performs as the supplier says it does. Even if 50% of the slip rings from a given batch are bad, it only matters to the buyer if they got one of the good ones. So, the seller needs to do relevant tests on a statistically significant number of components before making claims about them, but the buyer only needs to test the one component they bought. [/QUOTE]
Insert quotes…
Verification
What was Mr Irving's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Aftermarket magneto slip rings
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top