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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Electrics: Starter, Ignition, Coil, Spark Plugs/Cables, ECM, "TPS Reset" » Mismatched spark plugs « Previous Next »

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Gringo
Posted on Wednesday, June 13, 2012 - 01:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

lots of problems seem to start with the basics and spark plugs. we all know that the back cylinder runs much hotter than the front cylinder so my question is this; why dont we use a hotter plug in the back?
doubt if there would be a difference in performance, but there might be less problems with warm or cold engines and complaints of that nature. plus i think the plugs would "wear" more evenly.
opinions please.
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Sparky
Posted on Wednesday, June 13, 2012 - 02:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You've got it backwards.

If anything you'd want a colder plug in the hotter running cylinder so that heat from combustion leaves the plug electrodes/insulator faster; thus the "colder" description in the heat range of applicable plugs. The temperature at the tip of the plug would be colder than a standard or hotter plug. Thus it would survive better in a hotter cylinder than a standard or hotter plug.

A hotter plug for this situation would have the electrodes & insulator stay hotter than the normal plug and likely melt as compared to the prescribed heat range plug.
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