[Michael C Henry]

Once again, I have a Mallory HyFire VI. It has programable spark retard for starting, programable RPM limiter, another programable RPM limiter that could be activated by turning on a switch suppling 12V, for staging and such . The box could do all sorts of things to accomadate nitrous, supercharging, and souch that I'm not using. My unit ran for a couple of hours during breakin didn't see a problem. But load up the wife and head out. It would run just fine. About one to two miles out it would start missing and bucking and backfiring , anything above an idle. I'd turn the car back toward home thinking that it would completely die and I'd need to call for a tow home. To my surprise it would idle just fine, but getting the car to move from a stop and carry the car down the road it was terrible. The spark plugs would be all carbon fouled. This went on for weeks. finally I used the supplied shorting plug to eleminate the box and just use the distributor. It ran great. I replaced the box and didn't have that problem again. As I remember the box get full 12v and acts as a power supply to the distributor. The distributor without the box needs a resister to drop the voltage. I anticapated that and have a resister mounted and all it take is moving a 1/4 inch spade connecter to accomplish the swap. I can tell when I reach the rev limit and it seems to always surprise me. I seem to reach it so quickly.