I am aware of propagation delay which for most logic devices is in the low microseconds range. A problem for high speed/accuracy/frequency systems, which this application is not. I have read research that found advantages from slightly (microseconds) offsetting the sparks anyway.So you think there is a way of doing it with no propagation delay? You do understand that logic chips, that would normally be used for something like inverting a signal do have a propagation delay listed in their data sheet, don't you? And without looking I'd bet the bip373 shows one too.
You seem so obsessed with propagation delay yet you suggest two separate ignitions which you could probably never synchronise as closely as a single system with its propagation delay. Then theres cost, weight and more failure points. All important here.You are just making a 2 plugs per cylinder set of heads aren't you? Why not modify the reluctor ring or what ever the engine is using to signal the timing then use 2 of the Dynas?
In wasted spark mode you cant run both leads to one cylinder,they must go to different cylinders to work.Then each coil would be firing both plugs on one cylinder.
What do you think I left out that's relevant, ring gap, oil viscosity?. I don't understand why you say that. I made it very clear "what I really want to do", if you don't understand maybe your not the person I need help from. Or will this develop into typical forum " I'm smarter than you" childish crap.You really haven't given much information on your motor or what you really want to do.
Just how in the world do both plugs care or know they are in separate cylinders???In wasted spark mode you cant run both leads to one cylinder,they must go to different cylinders to work.
Your passive/aggressive tone, as though you were correcting me was bogus. Almost everything you said was wrong. Where is the "help" you talk of? I'm all for brainstorming, but it requires that the participants have at least some grasp of the problem. Sorry if I'm being over the top but I've had enough of people answering posts with an agenda instead of really trying to help.
The great majority of spark energy is developed across the plug under compression, the plug in the exhaust cylinder will give a feeble spark.
And to state how the wasted spark works is just another way of showing you're out of your league with this. It is harder to create the spark in the cylinder being compressed than in open air, like in the cylinder on the exhaust stroke. This is just simple physics.
I don't have to "pat myself on the back" ,you are just embarrassing yourself with your lack of knowledge of the subject. This thread has degenerated into you making stupid statements. Do I have an agenda by not agreeing or is it you by not Knowing what your talking about? Stop being such a fool and do some research before you open your mouth.You are looking for someone to pat you on the back and say how smart and knowledgeable you are, that is an agenda.
Wow, more loudmouth ignorance.. If you actually read and understood the question before opening your mouth , you would know I already describedHave you even looked at how the Dyna is wired on the primary side? The coil is triggered, sent to ground,inside of the module, so where are you going to get the signal you want to control the bip373 from?
I will use your agenda language. Do you really think you can physically time two magnetos to fire within microseconds of each other. Do you know what a microsecond is? Do you know what "dely" is. Do you know the mistake I made in my wasted spark description? Do you know whos really looking for a pat on the back? You do know this don't you?This along with an earlier statement about dely in the spark on one plug being OK.
You say "to determine" as if you know what your talking about(more agenda). I'm guessing with your attitude of opening your mouth before you think that you know as much about engines as you know about electronics and ignition systems..And I sked about you engine to determine if it is even going to give any added power output.
Aircraft engines use two separate ignitions for safety (redundency) Top fuel because they have to ignite an almost liquid charge.That is the reason that aircraft and top fuel use them.
Did you think of that obvious solution yourself? I explained why I am trying to go down a different route, but your agenda wont accept that. You are a perfect example of why it is so hard to get an intelligent answer to a problem on the internet. Thanks for hijacking this thread with your ********. I will not replay to your moronic crap. Do a fact check on every STATEMENT you have made idiot. Hopefully someone with some knowledge and no agenda will help.And you lead right back into my argument for using two Dyna modules by bringing up two Mags.
WTF, wasted spark is wasted spark and is exactly the situation I am wanting, the principal is the same.While what you say about how the 2 output ignition coils work is true in a car that uses them, it isn't right when they are used in a situation like you are wanting.
Firing plugs on a bench at ambient pressure has little to do with firing plugs in a motor. Wasted spark coils are designed to fire one plug on compression,one on exhaust. 80-90% of coil energy is released across the plug on compression where it is needed, 10-20% across the plug on exhaust. Firing two plugs on one cylinder splits coil energy 50-50= two weak sparks. To quote you when you were trying to be a smartarse "its just simple physics". This may sort of work (badly) on a low compression/speed Briggs and Strat...….sorry Harley Davidson, try it on a motor with 12:1 compression and 10k redline and the motor would not be happy.. How much did you charge the chump for your "performance" mod? To say OEM's "just choose" to do it the way they do is more of your desperate ignorance. You know more than them.The coils, if put on a bench and fitted with plugs and plug wires WILL fire both plugs at the same time. Having the plugs in two separate cylinders is NOT REQUIRED. That is just how the OEM chose to use them.
How do you type this crap with all those missing fingers.I have a small machine shop
What a gem. I don't "seem to forget" (more agenda bull). And you got it wrong. I've been licenced aircraft engineer for 35 years. Maybe you can teach me all about aircraft ignitions too. You can't physically time two magnetos within microseconds of each other except by pure chance. I don't think you have any appreciation of how small a microsecond is.And back to your 2 magnetos not being able to be timed to fire simultaneously you seem to forget they are both infinitely adjustable for timing. It is mechanical driven from the cam shaft and then split into two gears diving the mags. You run the engine and time one, then put the timing light on the other and time it.
How ironic. The very setup you mention is the perfect setup for a stagger fire engine like a Hurley. Yet in your wisdom you chose a very inferior setup.And that is how using two Dynas would work, one for cylinders 1-3 and the other for cylinders 2-4 or what ever your engines firing order is.
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