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Old 03-29-2013, 02:59 PM
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Ac spark plug heat ranges

I NEED A CHART OR AT LEAST AN EXPLANATION OF AC PLUGS AND THE HEAT RANGE DESIGNATION IN THE PLUG NUMBER. ie IS AN R46SZ HOTTER OR COLDER THAN AN R44S OR R45?

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Old 03-29-2013, 03:03 PM
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The number indicates the heat range. The higher the number...the hotter the spark plug.
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Old 03-29-2013, 03:22 PM
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Ok, now that i know what the heat ranges are on these plugs, i have another question. I have a popping in the exhaust and was thinking of changing to a hotter plug to see if that fixes the problem. I'm now running r46sz 's now . What do you think ? As the engine warms up the popping subsides but does not completely disappear.
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Old 03-29-2013, 03:49 PM
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AC Delco spark plugs, "R" means resistor type, "46" means: "4" is the 14mm threads and "6" is the heat range and "S" means projected tip. A "6" is the hottest AC Delco spark plug available. Besides, the heat range of the spark plug would not make any difference in exhaust sounds unless the previous spark plugs were fouled. You would see that when you removed them.
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Old 03-29-2013, 07:28 PM
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Well, so much for that idea. These plugs were running a little carbon on them. ? The one major difference i made to the car when this popping started was i exchanged the mallory unilite for a standard points type distributor. But i left the mallory coil in. I was told that the points type may not be hot enough , but i'll have buy a new module to find out. The car sat for like ten years and when i tried to get it to fire it would start and then die. Then i popped the module when i unwittingly hooked it up straight to twelve volts.
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Old 03-29-2013, 09:04 PM
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Ac spark plug heat ranges

Are you using an Ethanol added gas? I had a sooting problem on a set of AC-44's and cleaned them and then tested and reinstalled them. In 2 n=mores days a problem again. I pulled them and they were again sooted. So I called a racing buddy. He looked at them and told me "Welcome to the affects of Ethanol." We looked into my tank and filters. It was all dirt filed. I called a blending friend from the local refinery and he told me, "Get an Ethanol correcting additive." I did, and went to AC 45's and no problems now. Just my experience that may be of help. In my state Ethanol is blended routinely. I am looking for an Ethanol free gas distributor now.
Normbc9
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