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No. The board is just a driver. It's up to you to limit the current. It was made that way to keep it small. The ballast resistor value can vary and in general are very large and can dissipate some heat. Also some model coils don't require ballast resistors. It was just easier to make it that...

Long leads cause all kinds of havoc with radiated interference being picked up by the wiring and sneak paths for high energy back to the battery. It usually results in the hall sensor blowing. Also, connect things exactly as the diagram shows (short and direct) There must be a direct lead from...

Correct. The transistor tab is live. There is no need for that much heat sinking. But if you must, you could purchase a TO-220 insulating add-on with a mica washer, and insulator for the screw. The small heatsink I showed fits on the board and should be sufficient. Even more so if you can...

There is no need to go overboard with the heat sinking. One of the small TO-220 sinks that fit under the transistor right on the circuit board is sufficient. The transistor runs pretty cool even on a V-8 with normal rpm. The heatsink will be live. So keeping it small and isolated will avoid a...

I think we were typing at the same time and I had deleted the files until all was correct. See the update - post 211 and my comments in post 214. Sorry for the confusion.

BTW. If you are using a 12v supply you should use a ballast resistor or a coil that has one built in. Just like a car does. You will notice there is a bit of space left around the IGBT power transistor on the circuit board. This is to allow a small TO-220 heatsink to be fastened under the...

Here are the top and bottom separately and the schematic. Please double check the connections and the part numbers vs the schematic. I have several versions of the board and although they are all functionally the same the board layouts and part numbers may have changed.

EDIT: See message 211 Below for update. Here is a circuit board layout that you can translate to a vero board. It's double sided but you should be able to work that out on vero board. Also attached is the simpler schematic. It's electronically the same as the original but simplified to reduce...

x10 ?? Wonderful work - as usual. Thanks

"It increased the gas mileage on my old truck by 30% and lowered my emissions by up to 75%. " The car manufacturers would love to hear from you.

YES. Very impressive low RPM running. Good work.

DOM worked fine as-is for my Parcell and Weed full sized engine. 2-1/4 bore. I just honed it to get a cross hatch and that was it. BUT be very careful it is true DOM tubing. The supplier I use pointed me to a part of their shop where the DOM was supposed to be and there was a lot of tubing on...

There is one more fixture that is not covered by Trimble but is pretty handy to have. After annealing, the sides of the rings need to be polished and possibly to bring the rings exact thickness to fit in your piston ring grooves. It's a puck of metal with a shallow pocket machined into the end -...

Jasonb is correct. Check your figures Brian.

Yeah. Yeah. We've heard it all before. I do it like this.... I do it like that...... But is there anything wrong with Brian making the dedicated tool to do the job? BTW there is something to using the proper cleaving method. A similar method is used in cleaving fibre optic cables before the...

Proper cast iron whether it be ductile cast or gray cast - whatever you choose to use in continuous cast bar form is cheap from a reputable dealer. Don't use scrap iron. You'll just be in a world of hurt. As they say. Garbage in - garbage out.

Not that any of the following will help you make rings but you may be interested in what "the big boys" do for rings. This is Steve Morris of Steve Morris Engines in Michigan. He makes engines with turbos making upward of 3000hp. Interesting what he uses for rings in his engines. Most of it not...

Thanks Terry. I would take that as Gospel. I'm sure (as usual) you did your research. And thanks for digging up the old post Gordon. For those without a furnace. That would correspond to the color chart I posted earlier and my observation of a dark red when viewed in a dimly lit room that has...

I don't think your far off and have certainly backed it down from what was considered an error at 1475 F in the article. I just wanted to be sure you don't go off on too much of a tangent. BTW. Make the clever that Trimble recommends in the article. It's only a bit of simple machining work and...

1100 what? C or F. Where did you get that? Trimble says 1475 F which has been disputed by some as damaging to the cast iron. I'm not saying your wrong I'm just pointing out that some believe a mistake was made in the article. Don't start until this has been confirmed. I usually heat to a dull...