What volt coil needed?
- Thread starter busterrm
- Start date
the answer depends on the compression ratio, plug gap, rpm levels fuel/air ratio and the coils design, more volts won,t hurt but they won,t generally improve much either, its maintaining a precise and predictable timing of the ignition arc across the plug gap thats important 40K-45k volts is fine in most application, where most ignitions fail is that as rpms increase the delivered voltage drops but 40K-45k volt capacity in a coil and a plug gap in the .045 thousands range is certainly able to function correctly on most muscle cars with less than 11:1 compression ratio , and typical 12.7-14.7:1 f/a ratios running with out power adders , once you start adding things like nitrous, superchargers and alcohol or nitro it will require more amps and volts,
keep in mind as rpms increase the time required for a coil to recharge to full capacity remains constant but the time between sparks drops rapidly
Connect the red test lead of a digital ohmmeter to the primary side of the coil and the black test lead of the ohmmeter to the secondary side of the coil. The displayed reading on the ohmmeter should be between 0.7 and 1.7 ohms. You may have a faulty ignition coil if the readings displayed on your ohmmeter are not within this range.
4
Connect the red test lead of the ohmmeter to the coil's high-tension terminal and connect the black test lead to the coil's negative connection. The reading displayed on the ohmmeter should fall between 7,500 and 10,500 ohms. Your coil may be failing if the reading is not within this range.
Read more: How to Diagnose a Faulty Ignition Coil | eHow.com http://www.ehow.com/how_5982869_diagnos ... z21gN3XOmC
read these
http://en.wikipedia.org/wiki/Capacitor_ ... e_ignition
http://www.tonyfoale.com/Articles/Ignition/Ignition.htm
http://www.sentex.net/~mwandel/cannon/sparky.html
viewtopic.php?f=70&t=2798&p=13695#p13695
keep in mind as rpms increase the time required for a coil to recharge to full capacity remains constant but the time between sparks drops rapidly
Connect the red test lead of a digital ohmmeter to the primary side of the coil and the black test lead of the ohmmeter to the secondary side of the coil. The displayed reading on the ohmmeter should be between 0.7 and 1.7 ohms. You may have a faulty ignition coil if the readings displayed on your ohmmeter are not within this range.
4
Connect the red test lead of the ohmmeter to the coil's high-tension terminal and connect the black test lead to the coil's negative connection. The reading displayed on the ohmmeter should fall between 7,500 and 10,500 ohms. Your coil may be failing if the reading is not within this range.
Read more: How to Diagnose a Faulty Ignition Coil | eHow.com http://www.ehow.com/how_5982869_diagnos ... z21gN3XOmC
read these
http://en.wikipedia.org/wiki/Capacitor_ ... e_ignition
http://www.tonyfoale.com/Articles/Ignition/Ignition.htm
http://www.sentex.net/~mwandel/cannon/sparky.html
viewtopic.php?f=70&t=2798&p=13695#p13695
busterrm
solid fixture here in the forum
I am thinking of replacing the HEI distributor with a better brand, most offer 65k volt coils. Would it hurt to have that much voltage when 40-45 is all that is needed for engines under 11:1 compression? I'll have to reset the vac adv for the 8 degrees of vac advance at idle, and check the mech advance. But I had this HEI when was building this engine and was strapped for funds. So now that I have more money I want a new one.
busterrm said:
it won,t hurt a thing! it also is UN-likely to show a marked improvement IF YOUR current system is working correctly but its not voltage but the way the sparks controlled thats more important, the current trend is individual coil, per plug or individual on plug ignition coils triggered by a crank position sensor
read
http://www.aa1car.com/library/copign.htm
viewtopic.php?f=70&t=5916&p=18181&hilit=crank+trigger#p18181