Re: difference between D-16 and UD-16 spark plugs

Posted by Glen in TX on October 13, 2003 at 12:41:51 from (208.246.9.106):

In Reply to: difference between D-16 and UD-16 spark plugs posted by Dick Calland on October 11, 2003 at 09:49:54:

Dick, Joe described the auxilary plugs real well. The Champion application book will list the UD16 for a engine on a tractor or baler and then may list the D16 for another application using the same engine. They are interchangeable and will just depend on the condition of your engine and how you are running it. Champion recommends the UD16 on tractors with heavy PTO service or high rpm load. They also list using a D16 or D16J on the V4 Wisconsins. The D16J has a cutback ground electrode with modified gap. If the D16 is fouling try one of the others or a hotter plug like a D21. All of the 16s will be the same heat range. I run a UD16 with no problems on my Joy air compressor with 6cyld. Continental engine, battery ignition, which is the recommended plug but it runs most at high RPM. Have used the D16 and UD16 on Wisconsin V4s on hay balers, welders, and generators and not really seen any difference between them.

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