It came off a J.A.P. could prob find one small enough to fit inside your magneto case......nobody would even know and it would cost like $20 and maybe a fiddy bag to manu for a bit of steelies engineering, u could also delete the points and condenser and put in a lawnmower cdi module like manu did with his Villiers and dave on his victa. Stop by any major New Hampshire or Massachusetts engine show and chances are good that you’ll find John Rex there offering magneto charging, magneto advice and limited magneto service all at no cost. Display as a link instead, × Note the material a permanent magnet is made from. edit: I still wana see somebody make my idea of a weedeater/chainsaw flywheel and solid state cdi. 4)  Don’t remove the armature or rotor from a magneto because the magnets can be weakened. When the magneto malfunctions, the Weed Eater will lose energy or stop running. I want to see if it needs a rewind, of if the magnets/condenor is rooted/need remagnetising. Choice, could get him to scope it out and give a verdict. If the cover doesn't touch either side, you may have another problem. He removes the magnets, takes them to his local magneto service center for recharging, then puts them back on the mag. Once they reach the top, you can retrieve them or drop them back in. The flywheel magnet is definitely still a strong magnet but I have no way to judge if it used to be stronger. Nearly all such testers work by applying a voltage of about 150-250 volts to charge the condenser and measuring the current through the device once fully charged. Is there a way to get them to spark without the points? Magnetoencephalography (MEG) is a functional neuroimaging technique for mapping brain activity by recording magnetic fields produced by electrical currents occurring naturally in the brain, using very sensitive magnetometers.Arrays of SQUIDs (superconducting quantum interference devices) are currently the most common magnetometer, while the SERF (spin exchange relaxation-free) … Each magnet has a north south pole, if you install 1 or 2 of the 6 magnets backwards, you will have weak or no spark. im struggling to remember the innards of a lucas mag so dunno if that's relevent, magneto spark be grunty, i hope i isnt working if you decide to try feel it haha. Author's wife Myrna helping to bring a 'new' International vertical down from Canada. Recharging after welding is required. Its super risky if you have a dodgy ticker tho. It is possible to remove the magnets without weakening them by first installing a ‘keeper’ across the poles. This includes all types of Stationary Engines, Tractors, Boats, Motorcycles and Cars ranging from the most simple generator sets through to exotic racing machinery. We use the CRYPTON MAGMASTER (from the 1950s) to do a comprehensive testing programme on each magneto we rebuild. How do i test if the windings are good? usualy u can feel the spark outa the lead but not sure that it will always arc/jump/iduno over to earth like it does off a plug. everything else in mag can be deleted, I have a brand new lucas coil if you want it - would look the part at least. Clear editor. I have had 1 single spark at the points last night while spinning it by hand. You can purchase them through online retailers, or at a science supply store. this would imply the magnets are ok(ish). Performing a mag drop test is a part of every before-take-off checklist and involves running the engine up to a designed speed (usually around 1700 rpm in a Cessna 172), cycling through each of the magneto positions left, right, both, and ensuring that the magneto disconnects when grounded. Check out British motorcycles for sale: Order a copy today. Dispite it being only 2 nuts holding it on. You can post now and register later. Replace the magneto if the meter reads "OL." The remnants of the old HT lead should be sparking against the case though shouldnt it? Such a loss would hardly prevent a well-designed magneto from functioning adequately. Its a single cylinder unit. The engine, purchased about 1928, was used to supply electricity for pumping lake water. It is rumored that shock and vibration may demagnetize magnets, however I have never been able to observe this effect, even on early hardened magnet materials. If you want to run a mag-equipped engine on a battery and coil, make sure the mag lead is disconnected so battery current will not demagnetize the magnets. Click the thumbnail to the right to download a pdf of the file and print the directions. Leave the keeper in place until the rotor is replaced. dudes will pay more than 500 for a rebuilt magneto i'd think. As the internet is full of lies etc. Unsure if it works or not but may be worth a try. actualy maybe it wouldn't work iduno. Note the material a permanent magnet is made from. If the engine isn’t running and all electrical and mechanical items have been tested and eliminated as possible sources of trouble, then the magnets have probably been exposed to demagnetizing forces as mentioned above and recharging is recommended. However, they do require regular attention to the sharpness of the electrodes. John is doing research on the Webster Hi Tension magneto and would like to correspond with anyone who has information on these or their history. i.e its got a firm part of the revoloution. This is commonly … See how to test magneto resistive wheel speed sensors using a PicoScope Lab scope. Has a point on it, so if no ht lead is plugged in then it arks to the screw. Obtain a neodymium magnet, which is made of neodymium, iron and boron. Copyright 2021, All Rights Reserved | Ogden Publications, Inc. A heavy duty 12 volt portable magneto charger made by the author (or use at local engine shows). Bar magnets are good examples; with a spherical magnet, it's harder to tell which "end" is north or south. hey, dont feel like an idiot. This video shows the connection, scope set up and signal on a wheel speed sensor, other magneto resistive sensors will have similar voltage peak to peak fluctuations. Magneto Output Test . • Magnetic - Check magnetism and Remagnetise magneto body • Ignition - Check Spark strength, Spark timing and stability. They have an earthing screw to stop internal shorts from happening. My magneto is "type AM 32" very much like this one but nearly 30 yrs older. × Magneto tips. Just break the earth electrode off of the plug and test as before. The keeper should be a material which conducts magnetism well, such as soft iron. The voltage generated in the primary winding is a product of its velocity through the magnetic field and the strength of that field, so the condition of the magnet is vital for the correct performance of the magneto. The 3-point gaps are the best way of reliably testing the slow-speed performance of a magneto. Best Way to Test Magneto Resistive Position Sensors using the Autologic PicoScope I would recharge quench-hardened magnets on general principles if a magnet charger is readily available. This video shows the connection, scope set up and signal on a wheel speed sensor, other magneto resistive sensors will have similar voltage peak to peak fluctuations. Figure 1 examples of magnetos using horseshow magnets (left) and bar magnets (right). iduno about checks. Torch welding produces too much heat and should not be used. Would this one fit your stz? Use a mild steel arc electrode with good penetration such as E6011 and place small tack welds at each end of the crack. It does not require lots of cranking and/or high speed revs to work. 3)  Don’t connect a battery to the terminals of a low tension magneto. The points open and close and i have given them a sand. The X-Men have a lot of great villains- powerful and deadly foes that can give one of the most powerful teams in all of comics a challenge. Wrapping a few turns of wire around the magnets and ‘flashing ‘ the wire with an automotive battery or arc welder frequently exposes the magnets to demagnetizing forces and may weaken them rather than improve them. The gap between the main electrodes is typically set to 5.5 mm (as specified by Lucas for slow-running tests of their post-war magnetos). The test plate is used to test the breakaway force of a magnet. The old mags and mag literature, much of which has been donated to his collection, provides a base for knowledge and a source of parts. Customers include individual owners, collectors, companies, shops and museums from all over the world. He encourages people to do their own mag work and offers pointers on how to best accomplish it. Here we will examine the flywheel magnets and care for them properly during an engine service event. The armature was then temporarily removed, and the magnetic flux density at the centre of the cavity in the magneto body was measured with a gaussmeter before replacing the armature and continuing with the test for however many more minutes. I am scared of that. Remove the engine cover, locate the kill wire and unplug it first. Replace the magneto if the meter reads "OL." excuse my French. Immediately after quench-hardening, the material was rather unstable metallurgically and considerable change in magnetism could occur if magnetized during this transition period. dudes that like English bikes have lots of money man. Because removing the magnets subjects them to demagnetizing forces, the recharging restored the magnetism, but they again lost some of their magnetism upon removal from the charger. It turns over and feels like a small engine with low compression. If you have an account, sign in now to post with your account. Employ a spark plug for testing. Measure the distance between the flywheel and the magneto; it is usually set from.010-inch to.012-inch. Although i did bite the bullet and hold the HT lead and give it a spin to see if there was anything at all.... Nope. Removing the magnets from a magneto causes them to lose some of their magnetism. Why? I have some books tho so I will try find out. good is blue. * cub owner » Tue Mar 05, 2013 4:36 am assuming they did (big assumption), to actually be sure they worked would have required a machine to duplicate magneto operation by spinning magnet past with points and condenser operating. John Rex discussing magnetos with a couple of engine enthusiasts at the 1985 Pepperell, Mass, engine show. before you change anymore parts, scrap all the factory wiring. Permanent magnets are typically made from one of the following materials: Neodymium iron boron. The picture shows an original coil with failed insulation - a short-circuiting spark can be clearly seen.   Your previous content has been restored. The most common cause for these losses is that the magnets have been subjected to demagnetizing forces. it is c**p. get a good automotive cable for your CDI. This has the highest magnetic flux density (12,800 gauss), coercive magnetic field strength (12,300 oersted), and overall energy density (40). tis lush looking, edit: u can get it rebuilt all good. In "Taryl and Chuck Hill", Taryl demonstrates how to repair the flywheel magnets on a Kohler Engine (or Krohler as Taryl refers to it). Don’t weld across the entire crack as too much heat will anneal excessive amounts of material and reduce the effectiveness of the magnet. yeh u can use the points to fire a car style coil with a battery the same as lots of guys have done with their velo bikes. Special charging techniques must sometimes be used to adequately charge Alnico; however it is also much more resistant to demagnetization effects and almost never needs recharging. The needle of the compass will point directly south when brought in close contact with the north pole of the neodymium magnet. One difficulty is that a keeper frequently must be a complex shape so the magnets can be removed while the keeper is across them. The Wico EK mag is an exception to this rule and the armature may be safely removed and replaced without using a keeper. costs hundreds tho. Sorry I don't have any real useful info hahhahahaa. Why? Check the connection of the high voltage, or HV, wire to the coil and to the spark plug clip if you obtain a reading higher than 15 k. After making sure the connections are clean and unobstructed, retest. Spent an hour last night trying to get into it to take the armature out. Learn more click magnetizet open popover Customers who bought this item also bought Page 1 of 1 Start over Page 1 of 1 This shopping feature will continue to load items. The DB rig has an annular gap. If you are having trouble with your ignition system we recommend that you first change your spark plugs and HT leads. Would like to stick with the magneto, but if its rooted, i don't want to pay millions to get it rebuild. It literally quit while running, so that seems unlikely to me. A weak reading could indicate a magnet that has lost some of its strength. if you arent sure of your test it's not a very useful test. Alnico is not rolled from bar stock but is cast and has a rough surface texture except for the pole ends which are usually precision ground. Is there any way i can use the points in it to fire a coil? How do i cheque the windings? Using your magnet/s try to pull the pipe cleaners up the side of the vase. Would look boss as with the magneto running. 1) Take the case of an engine enthusiast who wants to get the maximum performance out of his magneto. show. Check the connection of the high voltage, or HV, wire to the coil and to the spark plug clip if you obtain a reading higher than 15 k. After making sure the connections are clean and unobstructed, retest. Don't put this test plug in … dude paid a couple hundred for one I had and it was super fucked and needed full restoration. Charge them on the magneto as an assembly. Their arch-enemy- and sometime best friend- is the man called Magneto.The mutant master of magnetism is one of the most powerful, and intriguing, villains of them all- a man who will do anything to ensure a future for the mutant race. Ok that is actually everything I know. Removing the magnets from a magneto causes them to lose some of their magnetism. lingling spec like the crack in his dizzy. What’s the right way to recharge them? The magnet merely acts to convert this mechanical energy to electrical energy. How A Magneto Works. Magneto repair stations usually don’t bother with keepers, because they recharge the magnets after all magneto work is completed (I usually totally demagnetize the magnets when working on magnetos so they won’t pick up iron filings, magnetize tools, etc.). it "COULD" also be the whole magneto assembly.. including the magnet. He wrote this article to answer some of the frequently asked questions about magneto charging. i.e its got a firm part of the revoloution. Note the white cables connecting to the author's truck battery. 2.10 Under-the-hook: Signifies applications in which magnets are used to lift and transfer large or heavy workloads. 2)   Don’t pile several magnetos together in a heap or pile. On Sunday, I finally had to say the heck with it and take an hour off just to see the show.”. 2.10 Under-the-hook: Signifies applications in which magnets are used to lift and transfer large or heavy workloads. It turns over and feels like a small engine with low compression. if the spark has nowhere to go you can make leaks happen out of the coil insulation and then its fucked forever. Paste as plain text instead, × It is a common fallacy that a permanent magnet expends internal energy to create electricity from a magneto or generator. Testing the Model T Magneto If your suspicious of the magneto conduct this test exactly as indicated and let us know the results. giving it a good flick by hand probably gets 1 to 2 complete revoloutions out of it. Run your mower and place a match book cover between the flywheel and the magneto core. Especially for a velobike motor. Engines manufactured after World War II contained magnets that were usually made of Alnico (aluminum nickel cobalt) and are much more stable than quench-hardened steel alloy magnets. One of their more innovative designs used for motorcycles was called the Maglita and was described as ‘a combined direct current generator and inductor magneto’. This indicates an internal short in the magneto. It’s like fishing! If a piece of material can be magnetized, it is likewise capable of being demagnetized. To easily and cheaply test your magneto's output, the document to the right will give you a good idea of how well it's working. The chart above was published by Ford to show what the typical magneto output should be in a Model T Ford. The current can demagnetize the magnets and might burn out the coils. “How often do magnetos need recharging?” is a question frequently asked by antique engine enthusiasts. Investigation into how this happens usually uncovers at least one of the following: 1) Take the case of an engine enthusiast who wants to get the maximum performance out of his magneto. There is nothing mysterious about it. jam a little wood screw into the old ht lead then pop on a lawnmower plug boot and voila you can put a plug in there. Confidence in the permanency of permanent magnets is substantiated by evidence of the many applications they have been put to over the years. Having magnets close together can cause them to partially demagnetize each other. Upload or insert images from URL. In some cases after breakage the magnets will not stay in place. In each case, the magneto was run (or not run) under the conditions in the left-hand column for however many minutes. Re: whats the best way to test a magneto coil Post by John *.?-!. Havnt got anything from the HT lead (which is rooted anyway). If the ignitor is timed to trip at the proper moment that the magneto is at peak in the cycle you will get a viable spark. Most magnetos on hit and miss engines used magnets that were made of quench hardened steel alloyed with chrome, cobalt, or tungsten. “I was charging magnetos from early morning until after dark at this year’s Orange, Mass. Keep magnetos away from each other by at least 3 inches. Re: flywheel magnets test what is it ? We made this piece of test equipment by modifying a rotating magnet Scintilla magneto. These are used when a magneto reassembly has reached the stage where it should be able to produce a spark. he refurbed my ariel mag. This test uses a Helmholtz coil to verify magnetic values. theres a lot of guys rebuild lucas mags. The best test procedure is to use an automotive condenser tester. every book I have read has a warning in bold letters lol. The current created travels into the ignition coil where it gets stepped up from low to high voltage. So maby not much resale value???? There is probably some reduction in magnetism over the decades; however, it is minimal and probably only results in about one third loss at the most. That was it. There are definite and logical reasons why magnets lose their magnetism. Below on the left - all rewound armatures are tested here as soon as they come out of the oven following the VPI process so that they are tested hot. chain driven on a lay shaft. is finished before charging so that some charge won’t be lost upon disassembly. The increased distance that the spark needs to jump will compensate for the lower pressure outside the cylinder so provides a more reliable result. And no other signs of sparks. Couldnt get the backing plate off. A good condenser will show a brief inrush of current till the device is fully charged then drop to zero. haha. Having magnets close together can cause them to partially demagnetize each other. The answer to the question ‘How often do magneto magnets need recharging?’ depends on many factors. The round base is fitted with small magnets to grip the metal bench top or the vice. not cheep for a rewind but he had all the sweet new old stock parts to spruce it up good, my only idea is get an HT lead that you know works and new plug, eliminate some bung components and test again, maybe look for something like continuity between windings and body etc, that shouldn't be there. When the magneto revolves there are two peak times of output. testing the resistance and comparing it to the spec in the manual. whether the engine is running or not should not really effect resistance. that is everything I know. hah. Keep magnetos away from each other by at least 3 inches. Check out Emma Riese’s impressive restoration of her late father’s 1921 Waterloo Boy K 2hp water-cooled engine. I have been spinning it heaps. Such magnets may never recover their magnetism even when recharged because the characteristics of the metal have been altered.
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