Hi Ed,
If you really want to use the 6v pack you can solder a couple of diodes in series with the positive lead. Each diode drops the voltage down 0.7 volts.
On the other hand the higher the voltage the higher the power consumption, and the faster your battery will drain.
The CH ignitions are the same a s the DL ignitions, and you still get a good hot spark with only 3.5 to 4 volts, just make sure that the gap is correct on your spark plug. 18 to 20 thousands max.
Below are the test done by CH ignitions………..
Bound_4_Hell
Life should NOT be a trip to the grave with the idea of arriving safely in a well preserved body,
but rather to skid in sideways, a Rum and Coke in one hand, and a beer in the other,
body thoroughly used up, totally worn out and screaming "WOO HOO what a ride".
__________________________________________________ ____________
CH ignition bench battery drain tests.
All tests were done at 8000 RPM. .A new single cylinder, Version 2 CHXL Ignition.
7.2 Volts -725 MA
7.0 Volts -675 MA
6.0 Volts -650 MA
4.8 Volts -475 MA
3.7 Volts -375 MA
3.0 Volts 300 MA
2.5 Volts 250 -MA
2.0 Volts - 175-MA -Weak spark, Do not know if engine would run, probably not.
Under 2 volts Ignition dead. Ignition still working but Hall Effect dead. We have done test runs and the engines run fine down to 3.2 Volts. Why use any thing over 4.8 volts. Three Nickel Metal Hydride would probably be OK. 3.6 volts.
You can find the whole document here. It’s called “ STUFF WE HAVE LEARNED “ From CH Ignitions.
http://www.ch-ignitions.com/tech.html#pwr