It's very irritating to me when some young cowboy with straightpipes jakes clear down to the last gear when empty on a level road. The message he is trying to get out is "look at me in my big truck". No wonder every town has engine brake signs.
The Jake brake slows down the tractor only. The trailer is just along for the ride when the Jake is used. The jake increases the engine's braking power by opening the exhaust valves just before the piston reaches TDC on compression stroke. That way there's very little compressed air left to push the piston back down. It's tricky because the exhaust valves have to be closed before the piston reaches TDC and they are timed so they close just fractions before TDC. Cat engines can eat valves if overreved with the jake on, like being in the wrong gear going down a mountain so the engine can't hold the load back. I tore one down that had been overreved and I found the valve heads from #1 cylinder in the oil pan. Jim
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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