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  #1  
Old 12-20-2007, 06:20 AM
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EXHAUST BACKPRESSURE!

Does anyone know what the maximum exhaust backpressure is for the 7.3 motor. I would like to know the pressure in psi if possible. I have found a couple different things about it, one site said maximum 250 hp backpressure and then i found a maximum of 60psi on another site but it was for a different motor. I'm sure they are all different. Is there a way to convert the 250 hp to a psi?
Please help
thanks
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Old 12-20-2007, 06:48 AM
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Are you looking for the point the drive pressure will float the valves or when it will set a code?


With a drive pressure (back pressure) of 64psi my truck will set a SES lite.
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Old 12-20-2007, 07:01 AM
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I'm after the MAX allowed before it screws up the motor.
I don't care if it sets of a code. Just need the max so i dont screw up something.
Or is there a max? If it gets to much backpressure then the engine will just stop right?
But i guess if it gets to high it could bend a piston or something.
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Old 12-20-2007, 07:03 AM
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i guess all im after is to hold open the valves for exhaust braking but again i dont want to screw up the engine.
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Old 12-20-2007, 07:11 AM
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Strokin: So you do monitor your backpressure? And i'm assuming you have an exhaust brake? Does your exhaust brake all minimal air through or do you shut off the flow completely? i was thinking of putting in a spring with a bypass valve that opened up at 60psi or monitor it and if the pressure goes up to high i can just open it up a little.
What you think?
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Old 12-20-2007, 07:31 AM
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What are you useing for an exhaust brake? As far as a Max that is going to depend on many things... Under load it will be higher, but under no load it will be lower...
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Old 12-20-2007, 07:40 AM
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I have built my own using a 4" cast iron butterfly valve which is used in compressed air applications and an electronic linear actuator. I know the pressure will change depending on load, i just dont want to overdue it.
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Old 12-20-2007, 07:46 AM
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Your playing with fire there... But take a look at the factory EBPV. It has a hole in it to help with the back pressure. With an exhaust brake I would not want to have more then about 50#'s back pressure...
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Old 12-20-2007, 07:46 AM
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And with too much back pressure your not going to bend a piston or rod, your going to float a valve and bend it or the pushrod.
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Old 12-20-2007, 08:14 AM
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I no longer have a factory EBPV, do you have a pic or know the size of the hole
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