So why gap to .040 instead of .035 like the books say? Please put in bonehead terms for me
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| Plug Gap Question https://slantsix.org/forum/viewtopic.php?t=26415 |
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| Author: | J. Goodman [ Fri Dec 28, 2007 5:50 am ] |
| Post subject: | Plug Gap Question |
Tomorrow, I'll replace the stock points system in my 69 225 with the Pertronix setup. Presently, I believe (haven't pulled them out yet) the plugs are gapped at 0.035". What should these ZFR5N's be gapped to with the Pertronix? Thank you. |
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| Author: | 66aCUDA [ Fri Dec 28, 2007 7:04 am ] |
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J I hope Dan will chime in but I think its .045 that he recommends. I hope this helps, Frank |
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| Author: | slantvaliant [ Fri Dec 28, 2007 8:10 am ] |
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What kind of coil are you running? I have an Accel "Superstock" coil (PN 8145) with my HEI. The Autolite 985's are gapped at 0.040". The next set will be NGK's. |
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| Author: | slantvaliant [ Fri Dec 28, 2007 8:21 am ] |
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Ooops. Double post |
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| Author: | SlantSixDan [ Fri Dec 28, 2007 9:03 am ] |
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Ditto on the coil question. Assuming a stock type coil, I'd use 0.040". |
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| Author: | 69a100 [ Fri Dec 28, 2007 9:07 am ] |
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If your ignig system is really up to date, i.e. pertronix, juiced coil, etc. you can go as big as .50 on the gap. |
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| Author: | chargerucd [ Fri Dec 28, 2007 9:24 am ] |
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hi, I have a bone stock ignition, so i have a question, Nowadays is it "better" to upgrade to the pertronics ignition? or to the mopar electronic ignition? planning to do that , just don't know what's better - or chaper? thanks |
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| Author: | SlantSixDan [ Fri Dec 28, 2007 9:31 am ] |
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Pertronix works. I'm not a fan of it (nonstandard parts). Mopar EI works and uses standard parts. GM HEI works better and uses standard parts. See HEI discussion. |
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| Author: | 69a100 [ Fri Dec 28, 2007 3:33 pm ] |
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Not to take away from Dan, to each there own. But for some reason mine runs better with the pertronix over the conversion. Go fish, maybe I have bad parts? Whatever, There's more invloved work with the conversion as with pertronix, it's like changing points. They both work better than points. |
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| Author: | Greg Ondayko [ Fri Dec 28, 2007 6:00 pm ] |
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Quote: Not to take away from Dan, to each there own. But for some reason mine runs better with the pertronix over the conversion. Go fish, maybe I have bad parts? Whatever, There's more invloved work with the conversion as with pertronix, it's like changing points. They both work better than points.
You didn't have the conversion wired backwards did you??If it runs crappy with the conversion try switching the wire leads to the distributor - It might run better - If yo tried that Then i'll leave it to dan. I favor neither of these systems - I run Pertronix on the Dart Below as it looks correct for that car but is A huge leap in consistenicy and technolgy over the Points, and I also have the Conversion in My duster Here: http://www.youtube.com/watch?v=_Ev3CqkG4RA Which is a huge Leap over the Chrysler Electronic Ignition. I guess I could set it up that way in the dart too If I just Found a Clever way to Hide the HEI parts say up under the fender well. - Oh well that's another project for another day. Greg |
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| Author: | J. Goodman [ Fri Dec 28, 2007 7:12 pm ] |
| Post subject: | Plug Gap |
Read all your posts at work tonight but couldn't respond until now. I am using the Pertronix Flamethrower Coil also in the conversion. |
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| Author: | SlantSixDan [ Fri Dec 28, 2007 7:43 pm ] |
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IMO, 0.050" is pretty well beyond the point of diminishing returns on most distributor-based systems, particularly wiht the small-diameter caps on our cars — extra-large gaps just increase the likelihood of damaging crossfire and greatly accelerate secondary ignition component wear (cap, rotor, wires, plugs, coil). |
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| Author: | ESP47 [ Sat Dec 29, 2007 3:02 pm ] |
| Post subject: | |
So why gap to .040 instead of .035 like the books say? Please put in bonehead terms for me
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| Author: | SlantSixDan [ Sat Dec 29, 2007 3:25 pm ] |
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Larger gap gives greater exposure of the mixture to the spark, for reduced tendency to misfire. Starting, idling, and driveability are improved. As plug gap grows larger, secondary ignition voltage climbs. The plug gap is chosen to give good ignition while staying within the performance and durability limitations of the secondary ignition components. When these include breaker points, the plug gap must be kept pretty small, otherwise the points cook in a hurry. Eliminating the points means you can increase the gap a little. Particularly if you put in the long-tip rotor, see this post and this thread. The total gap in the secondary side of the ignition includes the gap between the spark plug electrodes and the gap between the rotor and the cap electrodes. Reducing the rotor-cap gap means you can open the plugs a little. |
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| Author: | ESP47 [ Sat Dec 29, 2007 6:16 pm ] |
| Post subject: | |
I'm sort of confused. Can I gap the plugs to .040 with a long tip rotor in a points distributor or does this trick only work without points? |
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