Jakes don't make much noise. Running without mufflers does. It is simply that we have a bunch of idiots out there. It's the "look at me, I gots me a big truck", last of the "American Cowboy" attitude. Nothing wrong with having some "pride in your ride", but the excess chrome, chicken lights, etc are big wastes of money. Keeping all that chrome looking presentable takes time that could be used earning income. Shiny air cleaners on the outside look pretty to some, but they add wind resistance. If no room under the hood, tuck them behind the cab out of the wind stream. Shiny exhaust stacks are the same. They cost money to install, don't add to income, & you don't see the shinyness from the driver's seat. Engineers spend a lot of time & money doing wind tunnel tests to cut wind resistance, thus cutting fuel costs. Then owners do whatever they can to mess up the streamlining. If you get a chance, look closely at the stickers on the edge of a door. Manufacturers for the last 20 or so years have to place a sticker that the vehicle meets EPA noise limits when built. Also there is a fine of up to $10,000 for modifying any noise limiting equipment. I always wonder how these drivers pass their annual federal inspection without mufflers. Spent my working life on the road. Last boss speced out super duty mufflers. I very rarely turned off the Jake, only in slippery conditions, & then while looking for a place to park. Normally kept on stage 3. With good mufflers can't hear it, even with windows open. Boss regularly took tractors away at around 400,000 miles, take a new one, give the older units to rookies. Original brake shoes at turn in time inspection about 50%. Had a wheel seal go out on one, replace brakes on that axle, only brake repairs in well over 1, maybe 2 million miles. While on a rant-chicken lights. They look nice from a distance, you don't see them from the driver's seat, & don't add to income. A study about 12-15 years ago showed that each additional, not required, light costs $500 over the life of the rig. Starting at installation- modified wire harnes & shop time, whether ordered new at the factory or owner installed. At inspection time, every light, required or accessory, has to be working. Have 1 or 2 burned out, scale ahead open, time lost waiting for your turn at shop, shop costs, delayed delivery, etc all add up. As to using the Jake to slow the gears for shifting, a false idea. Learn to use the clutch brake the way it was designed. Make use of the clutch brake. Makes shifting quicker, quieter, & eliminates shock loads on drive line. Won't cause wear on clutch. Pushing clutch pedal about 1/4 inch or flexing your big toe on throttle cuts out the Jake. In over 40 years had only 1 clutch failure- rear oil seal on engine failed, soaked up the disk. End of rant, time to do something else. Willie, diesel pilot-retired
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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