I understand you trying to make a point that there is a rev limiter, but stating that running an internal combustion engine for extended periods of time is just not good advice to tell people to do. The OP was about blowing the carbon out of the EGR cooler by removing the EGR valve. Then it was professed that running the engine at WOT with the EGR valve removed was beneficial and that this could even be done for an indefinite period of time with no damage to the engine and should be routine procedure for anyone cleaning an EGR valve on a 6.0.

Are there times a test must be performed at WOT on an unloaded engine, yes there are. But these WOT tests are limited to very small number of specific diagnostic procedures performed after numerous other diagnostic tests have been performed without succesfully locating the problem. Can an internal combustion engine be run at WOT unloaded without perceived damage occurring, yes they can (but do you really know if you have not stressed the internal components, you will not without followup UOA for several oil changes). However, internal combustion engines also fail at a fairly high rate when run at WOT unloaded do to the increased stress on the engine components. Just because you have run an unloaded internal combustion engine at WOT without negative results to this point does not mean that it should become a routine procedure for all FTE members to follow and especially by someone trying to clean out some carbon from the EGR cooler. In addition if you damage a clients motor doing an unloaded WOT test procedure, FMC or the dealer will pay for all the repairs and pay the tech to perform the repairs. If the average FTE member running there unloaded engine at WOT in there driveway damages the motor they are more than likely on the hook for the repair bill.

As i have stated before advising people to run a 6.0 or any internal combustion engine at WOT while in neutral/park is not a prudent course of action. There are to many things that can go wrong while doing this that will lead to catastrophic engine damage.

 

blackhat you are right about the temps and putting a brick on the pedal. you are right about extended WOT time doing damage. not one post, unless i have over looked, suggested doing the WOT for extended amount of time. the post was just stating to go to WOT to clean out the egr which would be momentarily, not for 30 minutes.

once again, i am not telling anyone to hold the pedal to the floor. i do it, because i have to.

 

All this "brick on the accellerator" talk reminds me of one of the cold starting strategies International has apparently programmed in the 2004 and newer (egr equipped) DT 466s.
I inquired as to why our EGR DT 466s instantly rev upon cold start up (under about 20 degrees F) to 2,000 rpm plus, you can't really tell how fast becuase the tach is making its self check sweep and engine settles down before the tach completes its thing, but its scary fast for cold oil, cold engine. I was informed that because of the lower compression ratio in these engines, cold weather starting was a problem and International programs the engine to inject enough fuel upon cold start so as to temporarily reduce space in the combustion chamber thereby temporarily raising the compression ratio for easier starts. I was also told not to worry about it, the engine won't start till oil pressure reaches a certain threshhold and its operating as designed.
The instant, high rev up after it starts, goes against every notion I ever held about cold engine operation and if I had ever heard one of our drivers do that intentionally in the past we would have had words for sure.
This issue is definately one more reason I feel better using 5W-40 synthetic oil.
Sorry for the