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Thanks. Maybe you can get right into it and control it with a micro :)

Great job Don. I don't think I've seen another model built using the Prius form of the Atkinson cycle. Sounds like it has considerable compression and power. So what did you finally settle on for an ignition system? If your ignition is running on the power supply shown in the video you might get...

Would the width of the magnets on your hall sensor pickup have anything to do with the actual angle the spark occurs? Depending on the action of the coil driver the spark may occur when the magnet LEAVES the hall sensor (not when the magnet first passes over the sensor). If the magnets are quite...

Some nice work there Don with a nice selection of coils. That should cover a lot of bases. I found it interesting the the MSD "Blaster" coil really appears to be better and not just advertising hype. Much appreciated Can you make a check for me. My coil driver was designed for 12v. If you run...

A drag knife I think it's called - No? I'll have to give that a try. Thanks

Great work as usual Terry. You might have mentioned in the past - but how do you cut your gaskets?

BTW: I can appreciate your final statement. 7. Spend less time writing papers and more time building engines Thanks again for your efforts.

Ah. Ok it seems your coil had a built in resistor. They are available either way it seems. Mine has printed right on it that a ballast resistor is required. It's the big cylindrical type like you show in your setup. Hence my 2ohm ballast at 12V. Would it be possible to check a Ford two wire COP...

Great work Don. Much appreciated. From your report you say you used a 6v battery and limited the current to 1.2 amps for my module. Does that mean you used a 5 ohm ballast resistor? (assuming the coil is very low resistance). I've always used about 2 ohms on a 12v system for those typical coils...

Oh. BTW. I took note of your thinning of JB weld. I'll try to remember that. Thanks

Simply incredible. That's all I can say !! So much thought goes into your work before the chips fly. Amazing. Thanks Terry.

Fantastic work Don. I appreciate it. Very nice clean waveforms especially since they are directly from the secondary. Question: What type of resistors (carbon/metal film/wire wound) are you using and their wattage rating. Thanks

Thanks for your efforts Don. It seems to be a tough problem. Thinking outside the box a bit - (like way outside the box). Since you are trying to measure the energy ultimately delivered to the load (spark plug). Could absorb the delivered energy and measure it as heat. Maybe run the ignition for...

It would be interesting to do the mathematical FEA analysis of paulc's method of making rings in terms of the distribution of pressure around the cylinder bore of the compressed ring. I suspect there would be more pressure at the sides and closer to the gap than across from the gap. I think...

Just to add some more confusion / interest to the topic. Hastings isn't the only company in the game. In this video Perfect Circle perhaps an even older company goes through a process of machining the ring to a precise ellipse so that when it's compressed it becomes round. (at about the 8 min...

It appears the sensor could be used in place of a set of points or a hall sensor with a Sage/Gedde module. It's plenty fast enough. The part number appears to determine which direction it switches (high or low). But I ask why bother? Becasue it's pretty huge compared to a hall sensor or a reed...

You have a couple of questions in the last two posts. a) I'm not familiar with the inductive sensors but I believe they require some intermediate circuitry to provide a switch action. b) NO the sensor should not be used to drive the coil directly. If you can give me the part number of the...

Glad to have you behind the wheel Don. Keep up the good work.

74 Sprint: OMG - REALLY - you wrote: "I'm not going to do all the calculations" and then you come up with "it takes just 0.000000166267 seconds..." Did you really need to write twelve decimal places? I can't even see the screen well enough to move the decimal over to make sense of this...

Thanks for the offer Roy. But I'll pass for now. But I'll let you know. I have a couple of the original modules I can play with. I'm not sure what module Don is using and whether he can access his transformer for testing his theories. Maybe he could use a transformer to play with.