This also works for SR4 mags ( for four cylinder engines) as well. It is checking coil output prior to the distribution rotor so probably works for all ( LUCAS) SR type of magneto but I have only tried in SR4.
Hello Sir Thank you for an answer. I've been repairing and testing magnetos and every time I've had a question I don't know the answer either. In my imagination, I think the flux density is where the flux density is highest and the N pole is the strongest at the flux point. But in reality, the direction of rotation is different, and the anti-clock and clock can be set. The magnetic flux density is strongest at the corners of the magnetic poles when the magnetic field flows from the S-pole to the N-pole. However, the S pole also has a high magnetic flux density point. The magnetic field is generally said to be stronger at the N-pole, while the S-pole is weaker, which is the current situation. I don't understand the prevailing theory and the actuality of it, because it is different. Thanks for pointing me to the LUCAS manual link. I'll take a look at this document. I'm thinking of building an SR1 rotor using the new magnets. I failed once because I didn't understand the magnets. But I'll let you know when I've completed it. Thank you
Just make it clear.. the no answer, was to the question does the direction of rotation affect the strength of the spark. Also I made a mistake in the answer, it's not the points that are moved, it's the cam. To be more clear (hopefully) The cam has to be changed to match the rotation of the magneto. T Below is a description from the AJS/Matchless owners club site. hope it helps. Written by John Allen & Johnny Walker, July 1988 Internal Timing of Lucas SR1 Magneto. For a magneto to work successfully the contact breaker must open during a region where the change in magnetic flux is the greatest. This sounds complicated and fortunately on magnetos with rotating armatures the contact breaker plate is keyed to the coil assembly so this is not a problem. However the cam on the SR1 can be placed at any position relative to the rotating magnet and you can get into an awful mess. If you rotate the armature of an assembled SR1 magneto, without either the contact breaker or cam fitted, you will feel two areas of resistance to rotation and two similar regions where the rotor is pulled by the magnetic flux. These are the periods where the changes of magnetic flux are the greatest. You have to choose the correct period. Again rotating the armature you will note that the region between pull and the resistance will feel soggy and slightly strange, the magnet is in line with the magnetic path through the coil. The contact breaker should be about to open immediately the resistance to rotation is felt after this period, see the sketch.. The optimum position varies slightly and will have to be found by trial and error. With everything assembled and the contact breaker tapped on to the taper at the chosen point clamp a short length of heavy gauge copper wire, or brazing rod, to the body by one of the end cap fixing screws so that there is about a 1 millimetre gap between end of the wire and the stud on the coil. If everything is correct, and the coil, condenser, contact breaker points etc. are in good condition; there should be a healthy spark when the armature is rocked backwards and forwards. The spark should occur in the direction of desired rotation (clockwise looking from the contact breaker side for an AMC single). The cam can be repositioned slightly, usually in an anticlockwise direction, to give the best spark. If there is a double spark it is likely that you have not chosen the correct region of magnetic flux change.
@@kevracer3980 Your advice is an important resource. I understand it very well. I had an inkling of what it meant, but I couldn't be sure. This explanation will help me to better understand the adjustments to the camshaft which will help me to get a better spark. I've been documenting the SR1 maintenance, and it's a setup that's close to what I imagined. However, I have found that my hypothesis is wrong. I appreciate your consideration.
@@ratteshop9622 There's lot's on the internet about the SR1 but sometimes it's difficult to understand. That's the reason I made the video. If used in conjunction with the other information... all should become clear!
Dear Sir Please tell me about it. I understand that it is possible to adjust both the anti-clock lock and clock rotation direction. But the magneto rotor has two different directions of the magnetic poles, the anti-clock comes from the point side right to the S pole. The clock is the other way around. This means that the direction of the poles is different in the direction of rotation. Does this have anything to do with the strength of the spark? Thank you
It's a while since I did this video and at the time I did quite a bit of research. Everything I read and from my experience doing this job gives the answer no. You are correct when you say position of the poles relative to the points is different depending on the rotation direction, that is why the points have to be moved very accurately to match them to the flux point of the rotor. I did the video because it took me a while to understand the instructions in the Lucas manual! brightsparkmagnetos.com/library/LWImags/Magnetos%20SR1,%20SR2,%20SR4.pdf The cam timing is on page eight. I hope this is of help.
Newbie question, I have a clockwise direction Lister D, but the mag is anti clock. Can it and how to be change clockwise? The way from my understanding is that this is changed to anti clock in the video right?
Hi, It's a while since I did this video and I would have to watch it to able to do it again but... You can make a anti clockwise magneto into a clockwise magneto and vice versa. So the answer is... Yes.
@@MrStinger1988 Hi Mr Stinger, I have added written instructions to the video... I'll also paste it here. There's lot's of written instructions on the internet but it takes a bit of getting your head around the instructions... That's why I made the video. Kev Below is a description from the AJS/Matchless owners club site. hope it helps. Written by John Allen & Johnny Walker, July 1988 Internal Timing of Lucas SR1 Magneto. For a magneto to work successfully the contact breaker must open during a region where the change in magnetic flux is the greatest. This sounds complicated and fortunately on magnetos with rotating armatures the contact breaker plate is keyed to the coil assembly so this is not a problem. However the cam on the SR1 can be placed at any position relative to the rotating magnet and you can get into an awful mess. If you rotate the armature of an assembled SR1 magneto, without either the contact breaker or cam fitted, you will feel two areas of resistance to rotation and two similar regions where the rotor is pulled by the magnetic flux. These are the periods where the changes of magnetic flux are the greatest. You have to choose the correct period. Again rotating the armature you will note that the region between pull and the resistance will feel soggy and slightly strange, the magnet is in line with the magnetic path through the coil. The contact breaker should be about to open immediately the resistance to rotation is felt after this period, see the sketch.. The optimum position varies slightly and will have to be found by trial and error. With everything assembled and the contact breaker tapped on to the taper at the chosen point clamp a short length of heavy gauge copper wire, or brazing rod, to the body by one of the end cap fixing screws so that there is about a 1 millimetre gap between end of the wire and the stud on the coil. If everything is correct, and the coil, condenser, contact breaker points etc. are in good condition; there should be a healthy spark when the armature is rocked backwards and forwards. The spark should occur in the direction of desired rotation (clockwise looking from the contact breaker side for an AMC single). The cam can be repositioned slightly, usually in an anticlockwise direction, to give the best spark. If there is a double spark it is likely that you have not chosen the correct region of magnetic flux change.
@@kevracer3980 thanks a bunch. With this description I got my D going for the first time since I got it 2 years ago. Don't even know for how long before that. I was lucky enough to get it right after the first 2 tries. If you are on the The "Original" Lister D Type Stationary Engine Group on FB,I dropped you a mention and thanks
Just tried today and it worked . Thanks for sharing this
This also works for SR4 mags ( for four cylinder engines) as well.
It is checking coil output prior to the distribution rotor so probably works for all ( LUCAS) SR type of magneto but I have only tried in SR4.
Hello Sir
Thank you for an answer.
I've been repairing and testing magnetos and every time I've had a question I don't know the answer either.
In my imagination, I think the flux density is where the flux density is highest and the N pole is the strongest at the flux point. But in reality, the direction of rotation is different, and the anti-clock and clock can be set.
The magnetic flux density is strongest at the corners of the magnetic poles when the magnetic field flows from the S-pole to the N-pole. However, the S pole also has a high magnetic flux density point.
The magnetic field is generally said to be stronger at the N-pole, while the S-pole is weaker, which is the current situation.
I don't understand the prevailing theory and the actuality of it, because it is different.
Thanks for pointing me to the LUCAS manual link.
I'll take a look at this document.
I'm thinking of building an SR1 rotor using the new magnets. I failed once because I didn't understand the magnets. But I'll let you know when I've completed it.
Thank you
Just make it clear.. the no answer, was to the question does the direction of rotation affect the strength of the spark. Also I made a mistake in the answer, it's not the points that are moved, it's the cam.
To be more clear (hopefully) The cam has to be changed to match the rotation of the magneto. T
Below is a description from the AJS/Matchless owners club site. hope it helps. Written by John Allen & Johnny Walker, July 1988
Internal Timing of Lucas SR1 Magneto.
For a magneto to work successfully the contact breaker must open during a region where the change in magnetic flux is the greatest. This sounds complicated and fortunately on magnetos with rotating armatures the contact breaker plate is keyed to the coil assembly so this is not a problem. However the cam on the SR1 can be placed at any position relative to the rotating magnet and you can get into an awful mess.
If you rotate the armature of an assembled SR1 magneto, without either the contact breaker or cam fitted, you will feel two areas of resistance to rotation and two similar regions where the rotor is pulled by the magnetic flux. These are the periods where the changes of magnetic flux are the greatest. You have to choose the correct period. Again rotating the armature you will note that the region between pull and the resistance will feel soggy and slightly strange, the magnet is in line with the magnetic path through the coil.
The contact breaker should be about to open immediately the resistance to rotation is felt after this period, see the sketch.. The optimum position varies slightly and will have to be found by trial and error.
With everything assembled and the contact breaker tapped on to the taper at the chosen point clamp a short length of heavy gauge copper wire, or brazing rod, to the body by one of the end cap fixing screws so that there is about a 1 millimetre gap between end of the wire and the stud on the coil. If everything is correct, and the coil, condenser, contact breaker points etc. are in good condition; there should be a healthy spark when the armature is rocked backwards and forwards. The spark should occur in the direction of desired rotation (clockwise looking from the contact breaker side for an AMC single). The cam can be repositioned slightly, usually in an anticlockwise direction, to give the best spark. If there is a double spark it is likely that you have not chosen the correct region of magnetic flux change.
@@kevracer3980 Your advice is an important resource.
I understand it very well.
I had an inkling of what it meant, but I couldn't be sure. This explanation will help me to better understand the adjustments to the camshaft which will help me to get a better spark.
I've been documenting the SR1 maintenance, and it's a setup that's close to what I imagined. However, I have found that my hypothesis is wrong.
I appreciate your consideration.
@@ratteshop9622 There's lot's on the internet about the SR1 but sometimes it's difficult to understand. That's the reason I made the video. If used in conjunction with the other information... all should become clear!
Don't assume that everyone knows what the 'flux point' is and explain about the armature magnet position.
Dear Sir Please tell me about it.
I understand that it is possible to adjust both the anti-clock lock and clock rotation direction.
But the magneto rotor has two different directions of the magnetic poles, the anti-clock comes from the point side right to the S pole.
The clock is the other way around. This means that the direction of the poles is different in the direction of rotation. Does this have anything to do with the strength of the spark?
Thank you
It's a while since I did this video and at the time I did quite a bit of research. Everything I read and from my experience doing this job gives the answer no. You are correct when you say position of the poles relative to the points is different depending on the rotation direction, that is why the points have to be moved very accurately to match them to the flux point of the rotor. I did the video because it took me a while to understand the instructions in the Lucas manual! brightsparkmagnetos.com/library/LWImags/Magnetos%20SR1,%20SR2,%20SR4.pdf
The cam timing is on page eight. I hope this is of help.
Newbie question, I have a clockwise direction Lister D, but the mag is anti clock. Can it and how to be change clockwise? The way from my understanding is that this is changed to anti clock in the video right?
Hi, It's a while since I did this video and I would have to watch it to able to do it again but... You can make a anti clockwise magneto into a clockwise magneto and vice versa. So the answer is... Yes.
@@kevracer3980 any help will be appreciated as to how. I only have this one magneto,and they are hard to find here in South Africa otherwise.
@@MrStinger1988 Hi Mr Stinger, I have added written instructions to the video... I'll also paste it here. There's lot's of written instructions on the internet but it takes a bit of getting your head around the instructions... That's why I made the video. Kev
Below is a description from the AJS/Matchless owners club site. hope it helps. Written by John Allen & Johnny Walker, July 1988
Internal Timing of Lucas SR1 Magneto.
For a magneto to work successfully the contact breaker must open during a region where the change in magnetic flux is the greatest. This sounds complicated and fortunately on magnetos with rotating armatures the contact breaker plate is keyed to the coil assembly so this is not a problem. However the cam on the SR1 can be placed at any position relative to the rotating magnet and you can get into an awful mess.
If you rotate the armature of an assembled SR1 magneto, without either the contact breaker or cam fitted, you will feel two areas of resistance to rotation and two similar regions where the rotor is pulled by the magnetic flux. These are the periods where the changes of magnetic flux are the greatest. You have to choose the correct period. Again rotating the armature you will note that the region between pull and the resistance will feel soggy and slightly strange, the magnet is in line with the magnetic path through the coil.
The contact breaker should be about to open immediately the resistance to rotation is felt after this period, see the sketch.. The optimum position varies slightly and will have to be found by trial and error.
With everything assembled and the contact breaker tapped on to the taper at the chosen point clamp a short length of heavy gauge copper wire, or brazing rod, to the body by one of the end cap fixing screws so that there is about a 1 millimetre gap between end of the wire and the stud on the coil. If everything is correct, and the coil, condenser, contact breaker points etc. are in good condition; there should be a healthy spark when the armature is rocked backwards and forwards. The spark should occur in the direction of desired rotation (clockwise looking from the contact breaker side for an AMC single). The cam can be repositioned slightly, usually in an anticlockwise direction, to give the best spark. If there is a double spark it is likely that you have not chosen the correct region of magnetic flux change.
@@kevracer3980 thanks a bunch. With this description I got my D going for the first time since I got it 2 years ago. Don't even know for how long before that. I was lucky enough to get it right after the first 2 tries. If you are on the The "Original" Lister D Type Stationary Engine Group on FB,I dropped you a mention and thanks
@@MrStinger1988 Glad it helped you.