Fuel Injector Nozzles -- Injector nozzles contain a chamber that fills with fuel. When the chamber is full, pressure increases rapidly. The high pressure pushes against a piston that pushes against a spring. When the fuel pressure exceeds the spring pressure, the spring starts to collapse. As the spring collapses, the piston moves up, uncovering either a single or a multitude of holes. The fuel rushes out the holes into the combustion chamber or pre-combustion chamber. When all the fuel has left disel the injector nozzle, the spring pushes oil the piston back on its seat, tightly sealing the nozzle.

I watch Riley paging through the book Diggers, a string of drool swaying gently from his chin. Here is the Big Muskie, the biggest shovel ever made (a bus sits in the blade), the trencher, the mole that dug the Chunnel. "Mama, read it!" he commands. We start over, examining each picture in detail, and I realize fan again how much I am enjoying myself. would never have spontaneously decided to research construction vehicles. But here I am now, able to inform unenlightened acquaintances about the difference between backhoes and bulldozers. I perk up when I pass a construction site, even if Riley is not with me. It''s so much fun that I hope I''ll be able to let it go when he does -- when his interest turns to, say, weaponry, as everyone assures me it will. I can see myself, birthday after birthday, giving him the latest innovation in construction machinery toys, while a teenaged Riley, too shy to point out that he is now into tax law, accepts them politely and without enthusiasm.

©2003 www.autoheaters.net All rights reserved.