Originally Posted by lynn brownlee
A valve is closed , they were patented and called a jake brake, the patent ran out and now any one can use them in a deisel engine, the turbo creates more compression due to a valve closing creating more back pressure, same way the pressure from the exhaust is boosted by a turbo to force air and fuel into the combustion chamber, so the exshalts valve is closed. A none turbo deisel engine can work by closing a exhaust valve. Diesels engine have tremendous compression compared to a gas or ringed engine. Gas engines do not have enough compression and could not use exhaust pressure to break a vehicle effectively.
Your post doesn't make any sense. You do know there is a difference between an exhaust brake and an engine brake right?
An engine brake, which is called a Jake brake, is a solenoid on top of the exhaust valve. During the compression stroke the solenoid activates and pushes the exhaust valve open. The term "Jake" came from the manufacturer Jacobs. There are other engine brake manufacturers like Pac Brake, but Jacobs is the most popular.
An exhaust brake is a system that puts a restriction in the exhaust system. Before the variable vein turbos company's like Banks were building an exhaust brake that goes in the exhaust pipe. It was just a flap attached to an actuator. When you turned it on the flap would close, causing a restriction in exhaust flow. Same principle with a variable vein turbo. When you activate it, the veins in the turbo close, causing a restriction in the exhaust system.
I hope all this makes sense. Lol
Also, I'm not sure what you are talking about when you say a "ringed" engine? Are you saying a diesel doesn't have piston rings?
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