—Lancaster Farming. Saturday, July 1. 1961 16 Tractor Spark Plugs Wear May Mean Poor Firing Ever wonder why you’re supposed to change the spark plugs in your tractor after every 250 hours of operation’ Why not leave them in for 300 —500 —even 1,000 hours as long as they look okay when you take them out? There’s a good reason, ac cording to the technical ser vices department of a nation al spark plug company En gneers there advise that the ir 250 hour change recom mendation is not actually based on the fact that spark plugs arc “worn out” in the strictest sense after 250 hrs. of service. This figure, se lected after extensive spark plug life tests —merely rep resents a safety factor be yond which plugs may mis fire under an extremely hea vy load It also represents the po.nl at which gas econ omy and horse power begin to drop The engineers consider a spark plugs worn out when it reaches the point where it is likely to misfire —regard- less of its appearance. And, contrary to popular opinion, misfiring doesn’t necessarily mean the plug didn’t create a spark It means simply that the plug failed to ignite the gasoline properly whether a spark was produced or not! How can a spark be pro duced and the plug still mis fire’ Because “spark track ing” (or high-tension current leakage) through carbon de posits on the spark plug’s fir ing end can result in a weak spark, which in turn causes incomplete burning of the fuel mixture, and results in a loss of both power and eco nomy. High resistance which de velops as the spark plug el ectrodes become rough and uneven and the gap between the electrodes increases, also can result in the spark be ing too weak Here too the gasoline isn’t ignited proper ly and incomplete burning of the fuel charge can result. A new spark plug with the correct gap setting needs a bout 5000 volts to fire How ever, as the plug remains in service, constant heat and chemical attack plus electri cal erosion cause the gap to become w der, thus increas ing the amount of voltage needed to fire the plug. Most spark plug engineers agree that a safety factor is needed in the spark plug to ensure proper plug perfor mance under every possible operating condition Conse quently, they try to keep the amount of voltage necessary to spark the plugs well be low the amount of voltage that the coil is capable of producing. . and keep in mind, ths safety factor must take into consideration the fact that as the ignition sys tem becomes older, it’s po tent al high voltage output drops off. A new ignition sys tern, for example, may be able to produce over 20,000 volts of electr city The same system after 1100 or 1200 hours without replacing any of the parts may only be able to produce 14 to 15.000 volts By extensive testing pro grams, Champion engineers have determined that the max mum useful hfe of a tractor spark plug is about 250 hours —if the safety fac tor is to be kept in mmd. Plugs used beyond this limit generally will not be able to spark under all operating conditions. Remember, as plugs re ma n in service, more vol tage is neede to make them spark As the ignition sys tem ages .its ability to pro duce high voltage lessens. If the point is reached where the spark plugs require mo re voltage to spark than the system can produce, the spark plugs misfire. Changing spark plugs at 250-hour intervals prevents this from happening. • Corn Growing (From page 1) loose soil might not cause a picking problem in a wet fall. He said, “I am tempted to try it (wheeltrack plant ing) on a piece of alfalfa that didn’t do too well this spring. I need some more From HORNCO FEEDS... another service to help business poultrymen! EGG PRODUCERS YOU WILL NEED -WHAT IS YOUR FEED COST PER DOZEN? -WHAT IS YOUR FEED CONVERSION PER DOZEN? -HOW MANY EGGS ARE YOU GETTING PER BIRD? Most egg producers cannot answer these questions, and yet they will be most impor tant in the future as other areas, such as the south, become more interested in egg pro- duction. The poultrymen of this area will have to know, by records, if they can compete, and if not, why and what they can do to correct the situation. Because D. E. Horn & Co. feel records are so important, they are offering as a service to their customers, the NEW HORNCO RECORD keeping system (prepared by NEPPCO), A COMPLETE NEW WAY TO GET THE RECORDS YOU NEED WITH VERY LITTLE WORK. Your Hornco Service Consultant and IBM machine will do the work for you. Write or call collect . . . learn about this new service from Hornco Feeds. / orrlco of - a* Northoaatorn Poultry Producoro Council In cooperation wttk Tho SUto Arrleull Parlad Nuaabar PLK 0 FEEDS D. E. HORN & CO., Inc. york,p4. Phone 2-7867 corn tor refilling the silo; so I might just try it.” Kreider also said he didn’t think the rough ground would present any more problem at picking time than the high ridges some farmers throw up a round‘their corn rows. The' looseness of the soil came in for its fair share of the discussion In the ad joining field, worked in the conventional manner, pud dles of water from the re cent ram storms stood in several places, while the farmers could walk through the wheeltrack plots with out feeling the' slippery mud beneath their feet RECORDS TO SURVIVE! ra] Extanaian Sarrlcas Flock lirliika BJrda knd af Periad Date P»rl»^ Eada XYZ • UNKSa tO-29-4 11-22—» 12-20-1 423* 1-17-9 2-IA-9 3-lfc-f *-U-» Fredd pointed out the wa ter absorbing ability of the loose- soil and explained that the water would be retained better as well. Since the soil has not been compacted and will not be stirred, no crust forms on the surface and wa ter does not rise to the sur face to evaporate. 0 Poultry tnsiness Systems CCC Production Racard Based on. taadlllO Bird* ir Day Birds <OUSED t » HENS lATCHE *4939 >07334 I*M99 1*2340 134419 1279*4 1230*4 “Service Makes The Difference” THE HORNCO MAN WITH THE HORNCO PLAN! While the wheeltrack plots showed considerable uneven ness in heights of the corn, most growers felt the crop would become more uniform later in the season. The corn seed appears to germinate at a more uneven rate when the soil has not been worked fine and packed firm For this Fatal Data* fcy*» Lira* klUty TaUl Faad 49412 92101 97144 12*01 40*1* 11110 94930 11390 93323 10429 33032 1025* WHEN YOU BUY FROM same reason, weeds g Crri ate later and are shaded' by the crop. Hess says he is well pi t ed with the trials but S( j “we didn’t do as good a i of controlling grass as would like to see.” At the discussion p et| after inspection of the Richard Maule of Q uat[ vi’le R 2 summed up ( feelings of many in atte t ance when he said, “’We resist change, but I ap« date the opportunity to to this meeting and I m 8l Mr. Hess is still young, ough to try some new p,. ods.” \ C* v \ V & ?r«p*r«d itU Iron M«drOßl< Bgt»/ Bird Labo* Mil *•2l T«tO • W
Significant historical Pennsylvania newspapers