My New Ignition Arrangement
#27
Lots of...weird...facts being thrown out there, but I dunno if it makes sense to most people.
I bet the Jacobs box got fried cause the two coils (wired in parallel) was too high of a load (i.e. low resistance / impedence) from the coils.
Check the manufacturer specs - certain CDI boxes can only go so low.
Stock FC coils are like 0.4-ohms and really on the high end in terms of resistance.
There are aftermarket coils that are well under 0.1-ohms, and running them in parallel really makes them scary for certain CDI boxes due to running almost like a dead short!
If anything you can measure the resistance over the parallel'd coils to see if they meet minimum CDI box output resistance specs...
After talking to other folks about the wastespark (leading) twin tower coil design, it's really a handicap at very high boost / power levels.
Due to the uneven loads (one under compression, the other into heavily ionized exhaust), the spark generation is uneven in the motor.
I'd prefer running at least a single coil into each leading spark plug...
-Ted
I bet the Jacobs box got fried cause the two coils (wired in parallel) was too high of a load (i.e. low resistance / impedence) from the coils.
Check the manufacturer specs - certain CDI boxes can only go so low.
Stock FC coils are like 0.4-ohms and really on the high end in terms of resistance.
There are aftermarket coils that are well under 0.1-ohms, and running them in parallel really makes them scary for certain CDI boxes due to running almost like a dead short!
If anything you can measure the resistance over the parallel'd coils to see if they meet minimum CDI box output resistance specs...
After talking to other folks about the wastespark (leading) twin tower coil design, it's really a handicap at very high boost / power levels.
Due to the uneven loads (one under compression, the other into heavily ionized exhaust), the spark generation is uneven in the motor.
I'd prefer running at least a single coil into each leading spark plug...
-Ted
#28
Originally Posted by RETed' date='Apr 23 2005, 06:44 AM
I bet the Jacobs box got fried cause the two coils (wired in parallel) was too high of a load (i.e. low resistance / impedence) from the coils.
Check the manufacturer specs - certain CDI boxes can only go so low.
Check the manufacturer specs - certain CDI boxes can only go so low.
Yeah, that's what happened the first time. Now, I run PFC > ignitor > FC1000 x 2 (parallel) > LX91 > NGK 9.
Stock FC coils are like 0.4-ohms and really on the high end in terms of resistance.
There are aftermarket coils that are well under 0.1-ohms, and running them in parallel really makes them scary for certain CDI boxes due to running almost like a dead short!
There are aftermarket coils that are well under 0.1-ohms, and running them in parallel really makes them scary for certain CDI boxes due to running almost like a dead short!
If anything you can measure the resistance over the parallel'd coils to see if they meet minimum CDI box output resistance specs...
OK, I shall do that and post the findings. Thanks for your input.
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