MSD 7531 PROGRAMING TROUBLE, HELP!
The GM HEI system changed the goal posts for inductive ign. It used IC control and variable dwell to extend the rpm range. The MSD 6 ign was initially a failure because of the extremely short spark duration, about 1/10th that of ind ign. ran rough & misfired at lower rpms. Some bright spark [ pardon the pun ] at MSD said: We will make it multi spark at low rpms. So an engineering failure was converted to success with marketing hype!
Dr. Hugh Holden [ www.worldphaco.net ] did extensive testing & research on HEI [ MDI ] & CD igns & did a comparison of both. [ might be a bit hard for you to understand RB, some words have more than five letters ]
Results/summary are below:
The GM HEI system changed the goal posts for inductive ign. It used IC control and variable dwell to extend the rpm range. The MSD 6 ign was initially a failure because of the extremely short spark duration, about 1/10th that of ind ign. ran rough & misfired at lower rpms. Some bright spark [ pardon the pun ] at MSD said: We will make it multi spark at low rpms. So an engineering failure was converted to success with marketing hype!
Dr. Hugh Holden [ www.worldphaco.net ] did extensive testing & research on HEI [ MDI ] & CD igns & did a comparison of both. [ might be a bit hard for you to understand RB, some words have more than five letters ]
Results/summary are below: