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Q:can you tell me the difference between part ignitor #91181 and Ignitor #1181
A:Hi Al, I'm glad to assist you. The PerTronix 1181 Ignitor has a fixed dwell time where the PerTronix 91181 Ignitor II has a variable dwell time based on rpm.
Q:How much increase of sparkplug gap,with ignitor II & HP coil ?
A:With reference to your inquiry on this Pertronix Ignitor (Part No. 91181), the spark plug gap would be 0.35 inches for this ignitor. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.
Q:On my 1973 Blazer, with new point kit, I have no primary spark from newer or older coil; coils test out okay on bench test. Maybe a problem with new points or condenser? There may be a ground problem in distributor, or there may be a problem with ignition module or pickup coil, not sure.
A:Yes, this Pertronix Ignitor - Part No. 91181 (Ignitor II Delco 8 cyl) should help your 1973 Blazer to switch over to electronic ignition. It senses the coil current level and use a powerful micro controller to adjust the dwell. Variable dwell helps to maintain peak energy throughout the entire RPM range. For further assistance please feel free to call 1-877-238-2623 and one of our representatives will gladly assist you with any questions or concerns you may have.