Recent content by dsage

I had no intention of being critical. I applaud your efforts. I enjoy all means to an end. I've seen a few posts here and there about using the three / four wire coils (driver included). Case in point post #112 by Eccentric. I might have missed your particular post . Seems the way to go...

Ok. Thanks for getting all the info together in one place. I'll order the stuff just to play around. That said my driver board (Sage / Gedde - presented elsewhere here) and a cheap COP coil is cheaper and smaller as a whole package. Also I've never run into a practical rpm limit with the coil...

Thanks Terry.

Welcome to retirement Roy. Well deserved. I'm very glad you were able to find another builder for the CDI's. There would be a HUGE hole in the model community if they were to disappear. And Thanks Dan for picking it up. We all appreciate it.

Crazy nice workmanship. Over and over on this engine !! Always amazing. What is your source for the Alodine process chemicals? I love the look. I already can do anodizing. Perhaps it is not necessary to add this process to my repertoire?? Thanks

bluejets: Was there ever a link posted for a CDI module that works with your circuit? I know you mentioned that some don't work with your circuit. Perhaps even some from the same supplier. It would be useful if you could post a link to get started. I can take my chances on supply reliability and...

Yes. Close enough. Although some of Roy's later ignitions were more sophisticated and used a PIC processor for multi spark and some timing functions.

If you do that Dave, see if you can use the miniature coils Roy used to use. The physical size is great if trying to hide it and the little buggers will jump a half inch gap. That's the plan. For the uninitiated - Be careful testing any coil with an excessive spark gap. At some point the coil...

Terry: I'm with you. Even though I make my own coil drivers I too don't like the large (COP) coils and the necessity to hide them. So I've been using Roy's CDI modules (originals as you show). But alas, they are not available any more. I guess it's about time to design my own. I have a few...

Forget the balloon. As suggested by others put your finger over the spark plug hole and check for compression. Try starting fluid to see if it responds.

Does the compression gauge have a working check valve?

Terry: PM me if you want a module.

You can buy these, but if you know someone with a 3D printer you can make them. I made a few of various heights. For 4 or 3 jaws. The magnets hold it in place. No need to remove it when you start the lathe. It can't go anywhere. It doesn't have to be that fancy either. Just a star shape. It...

I guess the bottom line is you need to design the engine (crank and cam) to suit what is possible / required for the ignition you want to use. Turn it over in your CAD program and watch the timing of the whole assembly and make a plan..

Thanks. I'll look it up.