| Peder D | -- 07-21-2014 @ 11:42 PM |
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Currently running Motorcraft plugs AL7C...perhaps not optimal for the 59A in my '46 Merc? Anyone know? See that the "recommended" Champion H-10 is good for show, but not for blow? My engine is overhauled from top to bottom, but seems to "miss" on one cylinder, making the idle/performance some what rough. Plug wires have not been changed since bought back in '04. Maybe a good idea to do so? Thanks, Peder
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| TomO | -- 07-22-2014 @ 6:15 AM |
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The plugs that you are using are compatible with the original H10 plugs. To determine if you have the correct plugs, drive the car at highway speeds (40-55 mph) for 30 minutes and then park the car without idling the engine for more than a minute or two. Pull the plugs and examine their color and condition. Here is a link to a chart on what the plugs may look like. http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp?mode=nml If the plug on the cylinder with a miss is carbon fouled, suspect a leaking power valve gasket. Check the spark on the cylinder that has a miss. If it is weak or intermittent, the plug wire may not be seated in the cap or the cap may be bad. I have had the copper core wires in my car since 1995 and they are still performing as new. If the spark is good, check the compression. Tom
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| supereal | -- 07-22-2014 @ 2:45 PM |
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I would run a dry/wet compression test to see if you have a sticky valve. That will mimic a fouling plug. Old valve springs take a "set" if the engine hasn't been run often. It is good practice to replace all valve springs when the valves and seats are repaired.
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| Peder D | -- 07-26-2014 @ 11:43 AM |
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OK, thanks to you both for good and helpful info...
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