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Don,
Current Dodge MOPAR accessory parts catalogs distributed in
Dodge truck dealerships offers the Jake Brake and shows a small photograph of
the device. It is a simple butterfly valve in a cast housing which can be
installed in the exhaust line downstream of the engine exhaust manifold and
turbocharger housing. When the exhaust brake is closed, exhaust
gasses cannot escape and back pressure inside the engine cylinders result.
Earlier 12 valve Cummins engines installed in Dodge Ram pickups had weaker
exhaust valve springs which allowed exhaust valves to be forced open when
exhaust brakes were installed and applied. I understand that a lot of
problems resulted. Later 24 valve Cummins engines have been redesigned in
various minor ways including stronger exhaust valve springs. Cummins now
offers Jacobs exhaust brakes for sale and installs them on Cummins equipped
Dodge trucks. Dodge does also. Current engine warranties are not
effected by installation and use of Jacobs exhaust brakes on Dodge-Cummins
trucks. This is discussed on the Cummins engine website, http://www.cummins.com
Harvey
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