Re: Blow off valve
A diesel doesn't have a blow off valve because it would not do anything. A gas motor controls throttle via the air coming in, a throttle plate opens to allow more air into the intake. A diesel motor is controlled by fuel so it doesn't need a throttle body. When a turbocharged gas motor lets off the throttle, the plate closes. All that boost in the charge pipe has to go somewhere- hence the blow off valve. It's basically a valve that releases the air to the atmosphere or sometimes recirculated back into the system.
Soooooooooo diesels don't have them because they don't need them, nor would they serve any function. If you want one simply for looks, go for it. Now, there are BOV's that "can" work on a diesel engine- but in my mind there's no point. It takes too much crap to actually have the valve pop off- with a proper setup you would never "need" them. (I'll say this as my opinion, as some big shot 1000hp racers may join in and say they're running one, haha.)
2000 F-350 4x4, 7.3L/6 Speed.