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Discussion Starter #1
I drive an 04.5 3500 with a nv5600, when i downshift i try to rev match or double clutch, but does blipping the throttle from idle rpm to say around 2000 rpm hurt the engine at all? Ive been told recently that free revving or revving not under load hurts an engine.
 

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Free revving a gas engine will allow you to over rev it and hurts the engine. For a diesel there’s no danger of that unless you have a highly modified engine and or tune.
 

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IMO, in long run yes, could cause damage, stock engines and trans are not designed/built/tuned for constant free revving.
 

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TECH SPECIALIST
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No, not gonna hurt anything.
 

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Mountain Man Customs
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IMO, in long run yes, could cause damage, stock engines and trans are not designed/built/tuned for constant free revving.
I would not describe rev matching one's shifts as free revving.


OP, if you are smoothly matching your engine rpms to your next gear shift, you will make your equipment last LONGER, not shorter.
 

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The Eaton/ Rockwell/ Meritors (and anything else I’m missing) won’t go into gear any other way. There’s vocational trucks that see that hundreds of thousands of shifts between overhauls.


Sent from my iPhone using Tapatalk Pro
 
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I would not describe rev matching one's shifts as free revving.


OP, if you are smoothly matching your engine rpms to your next gear shift, you will make your equipment last LONGER, not shorter.
Your 100 percent correct , smooth application is not same as Blip to me, which to me means quick jab of throttle which stock 3rd gen does not like and mismatch the timing of shift and trans and drivetrain don't like it.
 

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Discussion Starter #10
Your 100 percent correct , smooth application is not same as Blip to me, which to me means quick jab of throttle which stock 3rd gen does not like and mismatch the timing of shift and trans and drivetrain don't like it.
I wouldnt say i jab it, but I normally roll into about half throttle fairly quickly
 

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Absolutely no issue. It’s a key to extremely long clutch life just as double clutching does in some situations.

You either have to match input shaft speed or the synchronizer does it for you. There is no magic anywhere inside of that transmission.

Whoever told you that has no idea what they are talking about. Besides, Your engine is governed assuming you haven’t had that thing tuned with the removed rev limiter. You could sit there parked with your foot to the floor and it won’t hurt that engine assuming it’s up to temperature and in good operating health. The only way you can end up in a severe over speed situation is if you’re under heavy acceleration and stab the clutch pedal in, or downshift aggressively at an improper speed relative to the gear selected.

You guys should see how big standby generators get started. You won’t feel so bad about your 5.9 getting the throttle blipped a little.
 
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