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
BTH magneto
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="Pete Appleton" data-source="post: 93921" data-attributes="member: 145"><p>Ian is certainly right in that electronic ignition cannot 'advance' it can only retard from a known reference point.</p><p>I can't seem to find the advance curve graph mentioned but the website states <strong>analogue, non-programmable electronic advance</strong> I think that Simon's explanation is how we would like it to work but I don't believe it actually does. Any of the programming/ delay systems fall down when you are dealing with kickstarting a bike. You want it to spark on the very first compression so there is no time to calculate the required delay based on measured cranking speed. </p><p>When building an experimental ignition system for myself I used a second trigger point that is only used for starting. I set this to spark at tdc so there is no chance of it kicking back if you run out of kick just before the piston goes over the top. I imagine - but don't know - that this is how bth does it. </p><p>Many analogue advance systems simply rely on the rise rate of the signal to the inductive pickup as a measure of engine speed. That is why they seem to reach full advance so early. </p><p></p><p>It would be nice to get one of these magnetos on a test rig and find out what we are actually talking about.</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 93921, member: 145"] Ian is certainly right in that electronic ignition cannot 'advance' it can only retard from a known reference point. I can't seem to find the advance curve graph mentioned but the website states [B]analogue, non-programmable electronic advance[/B] I think that Simon's explanation is how we would like it to work but I don't believe it actually does. Any of the programming/ delay systems fall down when you are dealing with kickstarting a bike. You want it to spark on the very first compression so there is no time to calculate the required delay based on measured cranking speed. When building an experimental ignition system for myself I used a second trigger point that is only used for starting. I set this to spark at tdc so there is no chance of it kicking back if you run out of kick just before the piston goes over the top. I imagine - but don't know - that this is how bth does it. Many analogue advance systems simply rely on the rise rate of the signal to the inductive pickup as a measure of engine speed. That is why they seem to reach full advance so early. It would be nice to get one of these magnetos on a test rig and find out what we are actually talking about. [/QUOTE]
Insert quotes…
Verification
The Series 'A' Rapide was known as the '********' Nightmare?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH magneto
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