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Fantastic job Terry. (as usual). Another piece for your wonderful collection. I really appreciate your detailed build logs and learn a lot from them. Thanks

All good. Points. Enjoy it and the memories. Thanks

Hi Steve: I'm really glad you were able to acquire the engine. It's in good hands. But "When you say If something were to happen to it my heart would break" Do you mean if it were to go missing / stolen? Because if something were to simply break, for sure you could fix it. It would be nice if...

Use a function generator (or even a simple 555) and eliminate the physical wheel/hall/magnet/ motor etc. all together. That will also allow you to adjust the pulse width and rpm and will be more accurate and stable. Also no need for your "timing light". You have a scope - use it to measure...

DO NOT test your ignition systems by making them jump a large gap. You could damage the coil with an internal spark. The damage may not be apparent but when it is called upon to deliver it will continue to fail internally instead of delivering a spark. at the plug.

Use a DC generator as a load. Vary the field voltage to control the load. The load is easily measured by volts x amps output = watts. All easily logged The load being air or water cooled resistors. This method was was used by Albert Hutton on his Olympus Engine which I am the custodian of...

Your basic Urethane from a can applied with a brush or thinned and sprayed works fine.. You probably have some around already. Give it a try. Let it dry for a lengthy time (like a few weeks) before exposing it to fuel. That said I use Naptha as fuel not gasoline. But oil doesn't bother it...

Calculate the circumference of the flywheel (pixD) Using cad draw a line that long and divide it into 8 (the number of spokes). Print it and cut a strip from the paper and wrap it around the flywheel. Center punch where the marks are on the paper. Drill. If you need a longer strip than 11" (the...

Quick glance. It looks good. The proof is in the pudding they say. Give it a go and see how you make out. The only minor suggestion is to fatten up the traces from the battery to the coil and from the coil to the transistor. i.e the path the coil current will take. If it's pcb material your...

This is post #236. (in the top right corner of this box). Scroll up the page to the top and click on page 11. and down to #211. Basic stuff navigating this forum. (you can also scroll down to the bottom and select page 11 too).

Schematic and board layout are in Post 211. What are the boards in your picture??

Update: You're in luck ! I rummaged around through my never used parts and found a dozen or so BC547 transistors. Surprised me. The BC547 works fine to replace the 2N4124. BUT You just have to reverse the collector emitter orientation as mentioned before.

Odd. I just checked Digikey again for the BC547 Farnell recommended. They list the BC547 as obsolete as well. So use what you can get I guess. I'll have to find a replacement with a more stable supply. Spec-wise the BC547 looks like it should be ok. Nothing special is required there. It's used...

I guess time moves on. Yes it appears the 2N4124 has gone obsolete. Very strange. It's a pretty much bread and butter transistor. The substitute should work. BUT That particular substitute has a difference in the pinout. The legs are situated looking at the flat face left to right: CBE...

I just checked the link you gave to my original saved spec sheet and it's the same. I'm not sure what schematic you are using. I went back to post #144 to the schematic that John Gedde (who was collaborating on this design) and he used the correct symbol that looks pretty much like the spec...

SO now go the extra (simple) step and try Terry's light mask technique to see how well they fit in the cylinder. The extra few minutes is worth it.

Ok. I figured you would have checked them out. I assumed they had a lot more torque for a comparable size. Good to know. Thanks

Terry: Have you researched Brushless DC motors (called BLDC) and their torque?

Brian: Read back a bit (post 247) L98fiero gave you a place in Mississauga. That's where I get it and all the model makers in the Toronto and Hamilton clubs go there too. You could drive there. They usually deal with BIG quantities but I have walked in the door and picked a piece from their...

Try starting fluid. It'll rule out quite a few things and get you going in the right direction quickly.