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Title: surface gap sparkplugs Post by: kingsburgphil on November 12, 2009, 05:03:52 am Perhaps one or more of the "Lounge Wizards" out there can relay the pros and cons of the use of surface gap plugs in a healthy NA motor. The technology dates back some 40 yrs. in oily 2 strokes with CD ignitions (Kawasaki 500, OMC outboards), then why not 400 hp. nitrous motors
that can break off ground electrodes at shift points? Assuming that race motors have high current ignition systems, why not use a plug that probably won't fail mechanically? Just a question from someone trying to catch up on what's new. Comments between anecdotal experience and finite element analysis are welcome. :) Title: Re: surface gap sparkplugs Post by: Jim Ratto on November 12, 2009, 23:24:41 pm the old 4 cam Carrera motors specified them.
Title: Re: surface gap sparkplugs Post by: WhiteTrash on November 13, 2009, 01:01:19 am What are surface gap plugs? ???
Title: Re: surface gap sparkplugs Post by: Jim Ratto on November 13, 2009, 01:15:01 am http://www.densoplugs.co.th/images/10l.jpg
Title: Re: surface gap sparkplugs Post by: TexasTom on November 14, 2009, 14:30:55 pm I've used them on a couple high-compression, Ducati race engines (modern).
Capable of making a few extra horsepower, but if everything's not JUST right, they foul easily and cause headaches! :P Then it's off with the bodywork (again) to swap for a fresh pair. They need serious current to get going ... a magneto would be good. Title: Re: surface gap sparkplugs Post by: mr horsepower on November 14, 2009, 18:54:56 pm They were used on 2stroke engines it has to do whit the 2 stroke oil that sticks om the plug so you need a higher current to clean burn them .
in a coldstart 2stroke the plug gets very wet but when heated up the oil vapors and the engine runs clean but if you use normal plugs in a 2 s before the engine gets warm the plug is soaked and will fail . gr henri |