Hot rodding the HEI distributor
From Crankshaft Coalition Wiki
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| − | + | [[File:GM Performance pn 93440806 HEI distributor11.jpg|thumb|300px||GM Performance p/n 93 | |
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==Overview== | ==Overview== | ||
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Next measure the secondary side of the coil: | Next measure the secondary side of the coil: | ||
*Set your DVOM scale to RX10K or higher. | *Set your DVOM scale to RX10K or higher. | ||
| − | *Put the probes between the | + | *Put the probes between the Ground terminal of the coil and the carbon pickup inside the distributor cap. It should read between 6000Ω and 30,000Ω. Outside of that range toss the coil and get a new one. |
| + | Test carbon pickup between carbon end and spring end - resistance will be 4000- 6000 ohms | ||
[[File:HEI cap.jpg]] | [[File:HEI cap.jpg]] | ||
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*14-18 degrees initial advance | *14-18 degrees initial advance | ||
*18-22 degrees centrifugal | *18-22 degrees centrifugal | ||
| − | * | + | *all in by =/< 3000 RPM |
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The above gives 46-48 degrees of advance (including vacuum advance) under light throttle cruse/high vacuum conditions. You want the mechanical advance in as soon as the combination will allow, without causing pinging. Using an adjustable vacuum advance unit allows the vacuum advance to be adjusted for what vacuum the vacuum advance falls out and tips in. Set it so the vacuum advance starts to drop out at about the same point that the carb power enrichment circuit (Holley power valve, Edelbrock step up spring, or Q-jet power piston) starts to come in. | The above gives 46-48 degrees of advance (including vacuum advance) under light throttle cruse/high vacuum conditions. You want the mechanical advance in as soon as the combination will allow, without causing pinging. Using an adjustable vacuum advance unit allows the vacuum advance to be adjusted for what vacuum the vacuum advance falls out and tips in. Set it so the vacuum advance starts to drop out at about the same point that the carb power enrichment circuit (Holley power valve, Edelbrock step up spring, or Q-jet power piston) starts to come in. | ||
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*[http://www.sparkplug-crossreference.com/ Spark plug cross-reference] | *[http://www.sparkplug-crossreference.com/ Spark plug cross-reference] | ||
*[http://www.webrodder.com/article.php?AID=53&SID=60 Exploded view of an HEI distributor] | *[http://www.webrodder.com/article.php?AID=53&SID=60 Exploded view of an HEI distributor] | ||
| − | *[ | + | *[hpuppy.org/ignition2/Ignition%202b.htm GM HEI distributor notes, etc.] |
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*[http://www.rustynutscarclub.com/HEI.htm Description of an HEI rebuild] | *[http://www.rustynutscarclub.com/HEI.htm Description of an HEI rebuild] | ||
'''''Return to: [[Hot rodding the HEI distributor#Distributor shaft end play adjustment|Distributor shaft end play adjustment]], above''''' | '''''Return to: [[Hot rodding the HEI distributor#Distributor shaft end play adjustment|Distributor shaft end play adjustment]], above''''' | ||
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