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Tractor Talk Discussion Forum

difference between D-16 and UD-16 spark plugs

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Dick Calland

10-11-2003 09:49:54




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What's the difference between a UD-16 and a D-16 plug? It's supposed to mean "auxiliary gap" but I don't know what that means either. Thanks.




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Glen in TX

10-13-2003 12:41:51




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 Re: difference between D-16 and UD-16 spark plugs in reply to Dick Calland, 10-11-2003 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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Joe (Wa)

10-11-2003 21:37:39




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 Re: difference between D-16 and UD-16 spark plugs in reply to Dick Calland, 10-11-2003 09:49:54  
Hi Dick, an "auxiliary gap" is Champion's term for a plug with an air gap in the core. The air gap prevents the plug from firing until the collapsing field in the coil rises to a higher voltage then required to fire a normal plug. These plugs are used in engines where full hp is required but are also subjected to low hp functions or prolonged idling that causes fowling. The higher voltage spark generated tends to blow the carbon off the electrode. They are sometimes referred to as self-cleaning or booster plugs. You can produce the same effect on a suspected fowled plug by pulling the wire and holding it about 1/4" from the terminal, the plug will fire, push the wire back on the plug and it will cease to fire if it is still fowled. Joe

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