Please reconsider your use of expanding foam to replace the tar. 1. The expanding foam is an insulation . So the box may feel 'cooler' because the foam isn't conducting heat to the exterior as well. 2. I would be shocked if the dielectric strength of the polyurethane foam is anywhere near that of the tar. 3. Having worked in a factory that builds radio units for utility companies, the potting compound used now is still has properties remarkably similar to tar. Even though it is epoxy based and far better spec's overall the tar is still a better choice for the coil box than polyurethane foam I suspect. Good video. 👍
@bwasman840922 күн бұрын
The foam is a very poor substitute for tar. The tar is to hold the solder joints and everything else from vibration. I have repaired many with either nothing or foam added when rebuilt and come to me with solder joints just broken with vibration and never one returned that was completely full of tar...with nothing left to vibrate.
@user-xv9ig5tf3x2 жыл бұрын
по сути обыкновенные катушки Румкорфа были использованы на форде модель Т и простой механический коммутатор
@mikekossor19803 жыл бұрын
The smaller, 630V capacitors at 8:11 appear to be the incorrect type (Metalized Polyester Film type; eg. Panasonic Type ECQE(F)) with low dV/dt rating; if so, they will likely fail with use in the Model T ignition coil application. The larger, lower voltage; 400V capacitor at 8:25 appears to be the correct type with dV/dt rating >600V/us which is required for the ignition coil application. The next important step is point adjustment for equal and consistent firing time. For that, there is no better tool than the ECCT. It is the only coil tester that actually measures dwell time to fire spark. More information here: www.modeltecct.com
@neutrodyne
3 жыл бұрын
You commented on the capacitor type but you did not say what value the Micofared cap should be. What is the cap value used in this coil?
@mikekossor1980
3 жыл бұрын
@@neutrodyne capacitor value is 0.47uF
@pookiemypookie1236 жыл бұрын
re you selling coils? if soo how much or how much to rebuilt mine
@barbarabusche80536 жыл бұрын
Appreciate the video but looking at your meter its at 30 and the scale ix x100. Isn't that 3,000 ohms not 30,000?
@thomthumbe
5 жыл бұрын
My coil measures about 3K
@rearl1869
5 жыл бұрын
I have 3 coils they all measure in the 3 thousand range-3200 -3600ohm
Пікірлер: 12
Very interesting :)
Please reconsider your use of expanding foam to replace the tar. 1. The expanding foam is an insulation . So the box may feel 'cooler' because the foam isn't conducting heat to the exterior as well. 2. I would be shocked if the dielectric strength of the polyurethane foam is anywhere near that of the tar. 3. Having worked in a factory that builds radio units for utility companies, the potting compound used now is still has properties remarkably similar to tar. Even though it is epoxy based and far better spec's overall the tar is still a better choice for the coil box than polyurethane foam I suspect. Good video. 👍
The foam is a very poor substitute for tar. The tar is to hold the solder joints and everything else from vibration. I have repaired many with either nothing or foam added when rebuilt and come to me with solder joints just broken with vibration and never one returned that was completely full of tar...with nothing left to vibrate.
по сути обыкновенные катушки Румкорфа были использованы на форде модель Т и простой механический коммутатор
The smaller, 630V capacitors at 8:11 appear to be the incorrect type (Metalized Polyester Film type; eg. Panasonic Type ECQE(F)) with low dV/dt rating; if so, they will likely fail with use in the Model T ignition coil application. The larger, lower voltage; 400V capacitor at 8:25 appears to be the correct type with dV/dt rating >600V/us which is required for the ignition coil application. The next important step is point adjustment for equal and consistent firing time. For that, there is no better tool than the ECCT. It is the only coil tester that actually measures dwell time to fire spark. More information here: www.modeltecct.com
@neutrodyne
3 жыл бұрын
You commented on the capacitor type but you did not say what value the Micofared cap should be. What is the cap value used in this coil?
@mikekossor1980
3 жыл бұрын
@@neutrodyne capacitor value is 0.47uF
re you selling coils? if soo how much or how much to rebuilt mine
Appreciate the video but looking at your meter its at 30 and the scale ix x100. Isn't that 3,000 ohms not 30,000?
@thomthumbe
5 жыл бұрын
My coil measures about 3K
@rearl1869
5 жыл бұрын
I have 3 coils they all measure in the 3 thousand range-3200 -3600ohm
paper clip is steel...better to use copper