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| Ignition coil thoughts | |
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| Tweet Topic Started: Mar 5 2009, 09:22 AM (1,975 Views) | |
| 99metro | Mar 5 2009, 09:22 AM Post #1 |
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putt-putt
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I am totally rethinking my fuel efficiency ideas. I am looking for a more complete burn and thought of an idea on Fullsizebronco.com called the Sixlitre tuneup (I'm sure this is elsewhere also). They essentially add a high voltage coil (around 48k), re-gap the spark plugs from .045 to .050/.055, change to a performance rotor/cap, install 8 or 9mm plug wires, and increase the ignition timing. There really isn't much in the way of ignition performance products for the 1.0, unless someone can steer me in the right direction. Maybe this won't make much of a difference, but it "seems" like it could. I really don't know the voltage output of the stock coil. Any thoughts appreciated. |
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| 2000Firefly1.3L | Mar 5 2009, 12:17 PM Post #2 |
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i think the secondary voltage was around 50,000 volts. check in the factory service manual |
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| Johnny Mullet | Mar 5 2009, 09:33 PM Post #3 |
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Fear the Mullet
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I won't really make much of a difference and the higher power coils also require more power to work properly. |
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| Bad Bent | Mar 5 2009, 10:41 PM Post #4 |
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Facetious Educated Donkey
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Better spark = better boom? I went with the Pertronix Flame Thrower II coil. 45,000 available volts. Now they come out with the 60,000V HV. Pertronix says higher voltage, bigger plug gap, better response, power, economy.I've done the same as you outline. I got 3Tech 9mm plug wires when Mike was selling them. He has recommended we go to his supplier. I like the Bosch +4 plugs. Also don't forget the ground. All that voltage has to go somewhere, eh. That's why I got the 7mm ground wires off eBay. My Geos body, Dizzy, engine block, tranny and alternator are directly grounded to the neg. battery terminal. I got the voltage stabilizer also, it's a wheatstone bridge basically. It adds some color and a red/green flashing led to the engine compartment. Looks are everything.
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| Johnny Mullet | Mar 5 2009, 10:47 PM Post #5 |
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Fear the Mullet
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I am not one to argue on this matter, but here is how I figure it............. Spark simply needs to ignite the fuel in the combustion chamber. That's it. The higher power spark is not going to make the fuel burn any faster. |
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| 2000Firefly1.3L | Mar 6 2009, 01:00 AM Post #6 |
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hey whatever works, works. it's your money and you can spend it how you wish. just make sure to share your knowledge
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| Woodie | Mar 6 2009, 07:27 AM Post #7 |
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Modern ignition systems and the improved mixture control of fuel injection have completely eliminated this as a viable performance upgrade. If a better ignition system makes a difference in the way that your car runs, something was wrong with your engine to start with. Back in the 60's, 15,000 volts was normal, and a better coil would make a slight difference. Now the cheapest car made comes with 40,000 volts, perfectly suitable for double the factory horsepower. |
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| Bad Bent | Mar 12 2009, 12:58 AM Post #8 |
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Facetious Educated Donkey
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That ground system? In a word... rust. Add corrosion and 12 gauge wires. Next word is trust as in I don't trust everything to be OK... modern or improved, sorry. Besides, it gives me something to do on weekends.
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| 87octane | Mar 15 2009, 06:57 PM Post #9 |
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drive it, break it, fix it, do it again
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I can confirm a stock 97 Geo coil is totally up to the task on an improved engine spinning up to 7500 with no misfire. That's pretty damn good. However, I want more... (of course) I'm impressed with the sick fast rise time of the very latest Pertronics Flamethrower III coil and I'm eyeballing it for 8000 rpm duty to match the head and cam coming down the road. I run a similar overkill ground arrangement like BadBent does. 4 gg from block to battery junction block, 4gg from batt to junction block, and no less than 10 gg everywhere else to junction block. And multiple chassis grounds along the 4 gg run. |
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| PushnFords | Mar 20 2009, 07:25 PM Post #10 |
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I don't think the hotter spark will make a difference...unless you widen the spark plug gap. From what I've seen in articles and personal experience the longer spark can help ignite the fuel mixture. Back in 2002 I upgraded the ignition in my '70 Ranchero with a Pertronix coil, electric ignition kit, good quality plug wires, and had the plugs gapped at .075" vs. the stock spec of .035". It seemed to make it run smoother but I never tried any economy tests. My Geo is all stock..... |
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| greggholmes | Apr 6 2009, 09:06 PM Post #11 |
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I stole this from another forum: "Output voltage of a coil is dependent on a lot of things like compression, plug gap and condition of the rest of the secondary electrical (coil to plugs) system. The voltage that companies advertise is mostly hype....the coil makes just enough voltage to jump the plug and no more. Some coils have the ability to generate higher voltage if needed but still generate only what is needed. If you are running high compression and a larger gap the coil will need to generate more voltage to jump the gap. ken" |
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| JAMES | Apr 7 2009, 02:21 PM Post #12 |
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it may cost more than a coil ,but i used a MSD system on a 70 monte carlo and my 89 el camino,almost all drag cars use them and they work great on street cars,they will work with your stock coil also. |
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Pertronix says higher voltage, bigger plug gap, better response, power, economy.



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7:32 PM Jul 10