Search results

I once found a setup and used it years ago. It used a series of high voltage zener diodes to test the high voltage output. The zeners were setup to cascade as the voltage went higher. Do a Google search for "high voltage zener cascade test setup" you should be able to find something to help you...

Your correct about the resistance but, what is being seen is the ionization of the gases just like a neon sign. Compressing the air (gases) does increase the resistance in the gap. Most modern ignitions (automotive) start to fail @200 psi, a really good racing ignition (>$800US) is good to...

Here is a story about spark strength. I was laid off during the winter of 94/95, being bored I decided I needed a hot ignition system for my race car. So using what I learned about RADARs I made a mega induction HEI ignition, the stock ignition did work fine. This sucker charged the coil at 48...

Complicated ??? yah sort of. Ok it is. But we are talking about a programmable ignition that replaces a mechanical advance. Well it took a bit of time but, this is the formula I came up with to convert MY pulse width into RPM it's not exact but, very close. This formula works with MY setup but...

There is a early type of ignition, (low tension ignition) for low compression engines that was used before transformers and it consists of just a single winding coil around a iron bar you can make yourself. It works on the fact that current wants to keep flowing in one direction. You know the...

LOL I hear yah. Ray

Your right Steve about the air/fuel mixture. Also I forgot to mention the Joules, I prefer to use watts though, more people understand watts it seems.

Ain't that the truth. My little CDI Sparky is capable of doing 50,000 RPM on a single cylinder but, then again that's using a 12 volt battery. I have thought about the window wheel. This is where the CDI ignition is nice. It can fire at a higher RPM than a standard inductive ignition because...

We must be using a similar magnet & Hall that have similar specs, the magnet looks about the same size as mine. I have my Hall mounted 3.5mm/0.138" away from the disc and the disc is 1.2mm thick. I have a person that wants one of these ignitions for his racing motorcycle a 2 stroke but, he needs...

Well I finally found some time to do more work on my programmable ignition and made a little movie showing the Hall-Effect frontend. Hall-Effect Frontend Movie I still don't have my 3D printer setup so I just used some wood blocks to mount the Hall-Effect. I also placed the DC motor in the the...

I think your over thinking this. Everything is either based on measured time or clock counts. Clock counts are more accurate at 16Mhz. Unless you have severe vibration there is almost no jitter to speak of. All the R/C ignitions I have seen usually have less than 1 degree of jitter, depending on...

Oh I hate it when the timing bounces around like that. I find it is usually related to worn out timing gears or the cam & distributor gear are worn out. Like the Chevy 4.3L V6, they are bad for wearing out early (razor thin teeth on the dizzy gear). Ray

Your right, I should have mentioned that crank fore and aft play (crank walk) does play a role. Some of the guys complained about this on the cheap China engines and they changed the code do like Eccentric has mentioned and did an averaging of the pulse timing. On the better built engines this...

Hey Lloyd how about using a IR sensor so you don't barn door slam a chicken. Ray

The width of the pulse varies with speed which, is why one has to do a calibration first. When one compares the timing of events of electronics and with mechanical events the mechanical is very, very slow. The pulse width also varies with the magnet's strength, the sensitivity of the...

Just so I don't confuse to many people, this isn't all the code necessary to make the ignition work. This shows a bit more of what is needed though and is only meant as an illustration. Anything following the // is a comment. The code below is setup for wasted spark or a 2 stroke engine and has...

Just some FYI. Here is some code that I use to calculate the RPM using the Nano. void getRPM() { long count; unsigned long currentTime = 0; unsigned long startTime = millis(); attachInterrupt(0,isr,RISING); //assign INT0, when pulse is rising pulsewidth =...

Just to add a bit, there are actually 3 sort of hard external interrupts, pins (2, 3, and 8). ISR INT0, INT1, and ICP1. ICP1 Pin 8 is different, it is a (Timer/Counter1 Input Capture Input) but, it is similar to the other programmable I/O's because pin 8 can also be programed as PCINT0 (Pin...

IMHO, For the first part, Parallax is still being made but, I have never gotten into them and don't know much about them. On the hobbyist side of things I would still go with Arduino because it was meant for the beginner/hobbyist in mind and it's about as close to the stamp as you can get, I...

Awake your right we are getting far too advanced for what is needed here so I'll restrict that stuff to PM's. The Arduino UNO is perfect for what is needed here I think. It has enough speed and resources for Eccentric to complete his task. I come from a RADAR tech back ground working on the...