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Re: Does this mean a TI ignition doesn't...
the TI ignition uses the resistor wire built into the wiring harness of the TI system.. my records show it to be about .3/.5 0hms. i built a tester for thr black boxes and i have a .3 ohm resistance built into the wireing that goes to the 12 volt supply.Comment
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Guys...
Well, I for one will not let Dale judge my car if he habitually extends his middle finger to the owners, and I guess I won't post on the board anymore because Duke thinks my number is too high! Notice I did not list my number here, but it is higher than Duke's. Someone here said something about this circuit not being RLC, but I have to disagree; the coil primary winding is the inductor, the ballast is the resistor, and the condenser at the points is the capacitor. Disclaimer; it has been a long time since my circuits classes, and I am just a ME, but RLC circuits have a natural resonant frequency based on the values of the components. The interaction of the inductor and capacitor shapes the waveform to provide nice voltage peaks in the coil (so the mutual inductance there can send high voltage to the secondary circuit) and the rounded waveform shaped by the inductor/capacitor preserves the points.Comment
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Re: Ed said, Duke said?
Andy,
You can try it but be careful. You can fry the coil with a full 12 volts applied to it. If you decide to try I'd use an aftermarket or generic coil rather than fry an original numbered Delco part. Rich #2276Comment
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Re: Guys...
Everett,
My point was that it is not an RLC circuit in the sense of a tuned-tank with the values selected to produce a predetermined Q. The resistor is there ONLY to drop voltage.
I didn't want to get into it before but, I do agree with you that your NCRS number does NOT directly relate to your corvette IQ. It only states when you became a member!
GaryCComment
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Re: Experts Only
Judges and Team Leaders should be the ONLY ones allowed to post information and answers. It already states in the "rules" that any other information is just for amusement and should not be considered correct. Plus, it is really expensive for someone to devote their volunteer time to be a judge, so all books and experience aside, they've really earned it. In addition, there's too much noise and confusion around here by some people. They should go. TBarr (NCRS number under suspension)Comment
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Re: Guys...
Agreed. This is sort of an odd circuit; it is DC, but has spiked input due to the points so it sort of acts like AC circuit, and has a wide RPM (frequency) range of operation. I am probably already WAY out of my area of knowledge... I was really hoping to get Duke and Dale to fire back at me with the number and finger thing. Can't wait to finally meet some of you CHARACTERS at the National or upcoming meets. By the way, how many of you on this board can say you were using it WAY back when the Indiana chapter owned it?Comment
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Re: Guys...
since i am not a member and have no number where do i fall in this category? let the flames begin!Comment
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Re: Guys...
Everett,
You could have been working for GM thirty-five years designing the very cars we're talking about, and joined NCRS yesterday. So, that makes you a green "newbie" with no knowledge on the subject?
This is not a good example, given large corporations' tendency to move technical and management employees around, but it still illustrates the point: The fact that you have a high NCRS membership number means squat. I have read posts on NDB from membership numbers in the 30K range that have obviously owned and driven Corvettes all their lives. If you have a low NCRS number, it simply means you have had THE OPPORTUNITY to learn a lot about Corvettes, and I think that is what Duke meant. Keep posting; I enjoy your comments.
Just my humble "in-expert" opinion.
Chuck SangerhausenComment
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The bottom line for Andy
If you want to test your engine in the chassis, test it with the ignition set up to production configuration i.e. use a ballast resistor. It will take less time to wire it in than the time spent haranging about it, and you will not run the risk of damaging any ignition system components. Run a jumper across the ballast during cranking and remove it once the engine starts.
DukeComment
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What Duke really meant!
Hey it was just a tongue in cheek comment, guys. I thought the ":)" at the end of the sentence is the cue to interpret it that way. Sometimes even I need some comic relieve from all this techno/historical mania.
DukeComment
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Re: Guys...
I knew that Duke was kidding. So was I. I just wanted Duke and Dale to fire back at me. I really enjoy this board and don't plan on quitting!Comment
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Re: What Duke really meant!
Duke,
You're cool with me, dude.
Truthfully, I didn't even remember the , but it was clearly getting unwound, and I knew you meant no disrespect to ANYONE.
I also enjoy a little humour on NDB; it's interesting to see what the irreverant Reverend Varoom comes up with sometimes. I enjoy your posts too, especially that techno-babble about corrosion and inbibitor packages; You must be a chemist or chemical engineer.
Chuck SangerhausenComment
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Both Ed and I are correct
My explanation was based on viewing the primary ignition circuit as a simple DC circuit (ignition on, points closed, engine not running). In this case Ohm's law will give us the steady state current. For a coil with a given resistance, a lower resistance ballast will increase the primary current. When the engine is operating a lower ballast will increase average current, and ignition energy available at the spark plug is a function of average primary current. Likewise, it is a (DC) voltage divider circuit where the voltage drop across each resistance is proportional to its value relative to total circuit resistance, so a lower resistance ballast will increase the voltage drop across the coil. As far as analyzing the primary ignition circuit as a RLC AC circuit, I didn't even want to get into that, but Dale's points are well taken (At first I thought it was Jack.). The ballast resistance does vary with temperature, and the resistance can become high enough that a considerable amount of heat is generated. That's why the resistance wire is built into a ceramic housing. Later designs and the TI used a resistance wire in the harness which dissipated heat over a wider area/volume. It was cheaper design, but it's perfromance was satisfactory.
DukeComment
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