E-3 spark plugs - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 16 (permalink) Old 08-05-2017, 12:36 AM
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I learned something at a seminar on spark plugs about changing brands. If you have a GM brand you should run AC Delco. GM designed and built the engine then designed a plug that had a heat range that matched what that engine needed. Now, if you want to run Champion (or other) plugs they will cross over to whatever plug is the closest in heat range to the AC Delcos. It is not a perfect match. Just as close as Champion gets to the AC Delco plugs. Usually good enough....but not always.

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post #12 of 16 (permalink) Old 08-05-2017, 05:50 AM
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I learned something at a seminar on spark plugs about changing brands. If you have a GM brand you should run AC Delco. GM designed and built the engine then designed a plug that had a heat range that matched what that engine needed. Now, if you want to run Champion (or other) plugs they will cross over to whatever plug is the closest in heat range to the AC Delcos. It is not a perfect match. Just as close as Champion gets to the AC Delco plugs. Usually good enough....but not always.
Champions are for mopars and lawn mowers. The only plug I have had pretty good luck with crossing over is autolite.

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post #13 of 16 (permalink) Old 08-05-2017, 10:52 AM
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a lot of what the cross-over charts consider is plug thread size, plug gap and heat range

So It fits is the criteria for parts books. Not- does it work correctly to OE spec, just can you sell what you have in stock!
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post #14 of 16 (permalink) Old 08-06-2017, 03:55 PM
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I tried the side gapping trick with NGK. Ran worse. I have a PowerArc optical ignition in my morphed 1200. With the gaps at 0.030" it would cut out at 7500 rpm. With an 0.025" gap it pulls to more than any sane person would let it. I may need more saturation time at higher rpm to run bigger gaps.

Some day I'll try iridiums in it.
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post #15 of 16 (permalink) Old 08-06-2017, 04:07 PM
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I tried the side gapping trick with NGK. Ran worse. I have a PowerArc optical ignition in my morphed 1200. With the gaps at 0.030" it would cut out at 7500 rpm. With an 0.025" gap it pulls to more than any sane person would let it. I may need more saturation time at higher rpm to run bigger gaps.

Some day I'll try iridiums in it.
That's a pretty tight gap. It should run well at .035" if it's firing right.

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post #16 of 16 (permalink) Old 08-06-2017, 05:09 PM
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Mine is a different beast, 1200 block, 77 heads, cams, carbs, shaved 0.030". The ignition uses three sparks per event ( probably just fluff for the second two sparks). The coils are supposed to be pretty fast saturating. All I know is that it feels like a rev limiter with the large gaps and pulls strong with the smaller gaps. This is what they recommend as well. If I buy the cable I can hook it to a laptop and increase the coil "on" time. That will maybe help it fire across a bigger gap, but I won't know unless I shell out the money for the cable--$125 or more
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