Anyone will try automatic transmission as a new truck driver straight from school?

Are you sure about that? Detroit has had jake brakes for as long as I can remember.
The Volvo engine retarder system is very similar to the jake system. I cannot think of an engine retarder system that is not modeled after the jake system.

They are after all engine valve/compression braking systems. Kinda like someone saying we are going skidooing not all snow machines are skidoos.

For us of lesser insight into the engineering of these systems can you perhaps enlighten us to the differences between a Volvo engine retarder and a Jake brake please.

 

Go back 1 page , read post #79 gives reference to DETROIT using the Jacobsystems Engine Brake

 

Auto correct on a cell phone can be a pain some times. I am not good at spelling anyways. I do better with a wrench or a gear shift....lol... hands on all the way... ask the misses, she likes everthing hands on.... lol

 

When you are downshifting let your RPM drop to the low end for the gear you are in without lugging the engine, give it a quick bit of fuel feed just as you shift. You want to get the engine back up in RPM to the high end of the lower gear. Only difference you are not using the clutch to make that transformation. With practice you will get to know what RPM to take it up to by the sound rather than the tach. Rome was not built in a day your ability to shift will not just come to you in a dream. In time you will get it.

 

A Jake brake works by releasing air from the cylinder heads preventing them from reaching the TOD (Top Of Direct-climb). Exhaust brakes block the path of the engine exhaust creating pressure in the manifold.

Jake brakes and Exhaust brakes are both retarders, but they have different operating concepts.

 

Ya ok ummm so do tell , when a piston is traveling to TOP DEAD CENTER, opening one of the two valves slightly causes a restriction, to me does not make sence to open your intake valve but slightly opening your exhaust valve causing a restriction in the system, causing the pressure to slowly release through the exhaust system. So what am I missing here besides the number of cylinders selected for the job. So what blocks the exhaust ???????? Have you ever tried to shut off the exhaust on an old 2 cycle Jimmy or a Cummings 350, The dam things will start to run backwards. The same thing that happens when you have a worn out govenor on one: revs up does not come down, try to exhaust kill it it will start to go in reverse.

 

Top Of Direct-climb Heard of TOP DEAD CENTRE but I think you made up some new Terminology

The pressure of the compressed air pushes back on the up-going piston, tending to slow the vehicle.
But, without a compression release mechanism, as the piston passes through top dead center and heads back down again, the compressed air in the cylinder acts as a spring and pushes the piston down, returning most of the work done in compression back to the crankshaft, creating very little braking effect.

 

It can be referred to both I think. I personally never heard Top Dead Center used. Then again, I'm not a mechanic.

 

I've heard the phrase "top dead center" regarding car engines...I'd imagine the "lingo" can translate to trucks...but then, I'm not a mechanic, I'm just a casual observer who occasionally learns something...most times, though, I see something shiny and walk away.

 

That's the only time I heard a mechanic say anything about top of dead center was referring to car/gasoline engines.