Jake Brake
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Joined: Nov 2003
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From: Nutter Fort, WV
For what it is worth, I also know of several IDI diesels running exhaust brakes without issues.
Do a search of the internet for "Exhaust brakes" and you will find several different units.
I seem to remember one called Pac Brake, and I think Bully Dog has one as well.
Do a search of the internet for "Exhaust brakes" and you will find several different units.
I seem to remember one called Pac Brake, and I think Bully Dog has one as well.
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From: Monroe, WA
They're really commen on Dodges too, but they are blaming them for destroying torque converters on automatics.
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From: Monroe, WA
The problem is the exhaust backpressure. Usually not something you want working against your engine. 
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From: Nutter Fort, WV
The extreme pressure caused by the exhaust brake can cause problems with the lifters from some things I have read. I have never seen it, but I have not seen 3 or 4 other things as well.
I did read a piece from International supposedly, that did say they do not endorse the use of exhaust brakes on the IDI engine.
But if you asked them I bet they do not endorse the use of chips on the Power Stroke motor either. But there are thousands of them running every day.
I did read a piece from International supposedly, that did say they do not endorse the use of exhaust brakes on the IDI engine.
But if you asked them I bet they do not endorse the use of chips on the Power Stroke motor either. But there are thousands of them running every day.
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Joined: Apr 2005
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I don't get the reference to -hydraulic- lifters. Don't see why those in specific would be any more or less an issue than mechanical. Engine's still turning...oil still pumping...
My understanding is that the problem isn't the lifters at all...the problem is the backpressure lifting the valves off their seats...
As far as I know, if you set your exhaust-brake to produce no more than 30psi, the IDI motor's OK with it. Double check that, but I've heard that from quite a few...
My understanding is that the problem isn't the lifters at all...the problem is the backpressure lifting the valves off their seats...
As far as I know, if you set your exhaust-brake to produce no more than 30psi, the IDI motor's OK with it. Double check that, but I've heard that from quite a few...
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Joined: Jan 2004
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From: clyde,ny
how can the valve lift off its seat when you have a 22:1 compression ratio holding it closed?
the problem is that with a exhaust brake you have back pressure holding compression in the cylinder and on our IDI's you have hydralic lifters that can collapse when they try to open the valve with all that back pressure against it.
like dave said,thousands of people using them with no i'll affects.
the problem is that with a exhaust brake you have back pressure holding compression in the cylinder and on our IDI's you have hydralic lifters that can collapse when they try to open the valve with all that back pressure against it.
like dave said,thousands of people using them with no i'll affects.
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you only have 22:1 at the very very top little bit of the compression stroke. For the other 99% of the 2 full crank revolutions of the 4 cycles, you don't have 22:1. In fact, for most of it, you don't have any compression at all...
During that time with no compression, the back pressure may lift the valve slightly...which then gets smacked by the piston.
That's the way the IH dealer mech. describes it. He also said that 30psi or less wouldn't be a problem.
Regarding opening the valve against "all that pressure", remember that there is additional pressure on the -back- side of the valve too. Is the pressure RATIO changing ?? I don't think it's changing that much. In any case, the lifters would only have to open against higher pressure for a few thousandths of an inch, and then flow would release any 'extra' pressure to the port...
In any case, thousands of guys are using them successfully, at <30psi
During that time with no compression, the back pressure may lift the valve slightly...which then gets smacked by the piston.
That's the way the IH dealer mech. describes it. He also said that 30psi or less wouldn't be a problem.
Regarding opening the valve against "all that pressure", remember that there is additional pressure on the -back- side of the valve too. Is the pressure RATIO changing ?? I don't think it's changing that much. In any case, the lifters would only have to open against higher pressure for a few thousandths of an inch, and then flow would release any 'extra' pressure to the port...
In any case, thousands of guys are using them successfully, at <30psi
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