- Joined
- May 28, 2003
- Messages
- 2,591
L.A.B. said:dynodave said:maylar said:For an EI system though, you can't use (2) 12 v coils in parallel, as it'll likely overload the ignition module.
YES you can use 2...12v coils in parallel.
But not with certain EI systems (such as Boyer or Pazon) where the current draw from two 12V coils would be likely to overload the box which is what I expect maylar was thinking of?
Actually the basis of my research is for the RITA which at 98% dwell is the MOST likely to "overload" and the old black analog boyer is a mere 75-80% dwell AND for a period of time I KNOW the boyer output transistor was identical to the RITA. It is in the literature/tech notes from John Carpenter on how to hook the 2 12V coils using diodes if you run in parallel. If you run 2 12v coils in series of course you will expect a lower voltage and sometimes problematic "miss" on high throttle opening or hi-compression. The Rita came with a triple diode pack for triples. Yes they can be overloaded. If you run a old boyer stuffed up under the tank, then what do you expect... smoke!
If an old boyer is run in a mount such as I designed to replicate the RITA mount down in the air stream then you will get pretty good life. I did test and repair a RITA on a guys box (commando) that ran a 1 ohm Harley twin lead coil. It (the box) finally died after about 20 years, the coil was still good!!!!! I was shocked......It was another example of the truely superior product with superior cooling potential that the Rita was...if installed properly. The owner was not aware it was short dwell 1 ohm EI harley coil until I told him.
In general I would agree and recommend to be as conservative as possible since it gives a margin of safety for all the screw ups that folks can possibly put in. :mrgreen: