Engine/Transmission (1994 - 1998) exhaust brake difference 94 to 98.5

[Pacbrake]

The PRXB comes standard as a 4", if you have a 3" exhaust we neck the adapters down, so that if you want to upgrade to a larger exhaust later you can without replacing the brake. It also come in a special order 5" for the real hot-rod diesels

 

[hsmith]

OK, question here. How high can I safely go on mine with the backpressure adjustment? Does the 60# springs mean you can run that much backpressure? This one does not have that much range anyway. Now have it set at 28 psi, and am not real happy with it. Went with the BD because they made me a good deal, as the tech that sold me the Super B said my Jacobs would fit. Think they were trying to make up for his stupidity.

Thanks, and by the way, we share a common name.

 

[Bart]

No, the 60# spring means that it takes 60 pounds of pressure to operate the valve from the cam and push rod. What it does is make the spring operate the valve closer faster and therefore will still close when there's more than normal exhaust back pressure. I have 60's and was told they are required when towing heavy "stuff" and using an exhaust brake. The flip side would be to float a valve long enough to have the pistion hit it. There's only 1/4" clearance between pision and valve in normal operating engine.

 

[Pacbrake]

To get the 60# psi brake you have to replace your exhaust valve springs, If your only running 30# stock springs. If you put a 60 #psi brake on a 30# spring you will float your valves. You can purch replacement springs for us or cummins, (I think BD might even have them as well) If your engine is a 24V it will automatically come with the 60# springs

 

[hsmith]

I have the 60# springs and am trying to find out how high I can safely adjust the backpressure on this unit.

Thanks for the info.

 

[Pacbrake]

60# is max you can adjust it to. if you have our old style vac operated direct mount just plug the chamfered hole in the butterfly and that will raise the back pressure to 60psi