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  #1  
Old 03-15-2019, 11:38 AM
jeff18 jeff18 is offline
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Default Using too high of a gear

Why does the truck growel and shudder when using a gear too high for the rpm of the engine? What is happening when it does this?
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Old 03-15-2019, 11:43 AM
djfllmn djfllmn is offline
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Default Re: Using too high of a gear

You answered your own question

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Old 03-15-2019, 12:09 PM
tomboy tomboy is offline
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Default Re: Using too high of a gear

For the same reason you do when you attempt to push something heavy while running. If you walk you can push it much easier, your engine is the same, overloading is what its called.
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Old 03-17-2019, 12:16 PM
dvrich dvrich is offline
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Default Re: Using too high of a gear

Quote:
Originally Posted by jeff18 View Post
Why does the truck growel and shudder when using a gear too high for the rpm of the engine? What is happening when it does this?

Are you serious? It's the same thing as a 135 lb man carrying his 300 lb bride over the threshold.
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Last edited by dvrich; 03-18-2019 at 06:25 AM.
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Old 03-18-2019, 06:06 PM
jeff18 jeff18 is offline
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Default Re: Using too high of a gear

I need to clarify. I know what lugging an engine is. What is the source of the vibration? Starvation of lube oil to the tranny gears? Pistons? Where does the vibration come from?
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Old 03-19-2019, 04:10 AM
djfllmn djfllmn is offline
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Default Re: Using too high of a gear

Quote:
Originally Posted by jeff18 View Post
I need to clarify. I know what lugging an engine is. What is the source of the vibration? Starvation of lube oil to the tranny gears? Pistons? Where does the vibration come from?
engine. you are almost forcing a misfire situation
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Old 03-20-2019, 02:47 PM
jeff18 jeff18 is offline
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Default Re: Using too high of a gear

Hmm, seems it is a mystery. Will see what I can find out from an engine builder and let ya'll know what I learn.
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Old 03-20-2019, 03:07 PM
Gunner Gunner is offline
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Default Re: Using too high of a gear

Engine balance is achieved by crankshaft counterweights and sometimes by an additional balance shaft driven by the timing belt/chain. When the engine runs slower than it was designed for, these systems become less efficient at keeping the engine balanced, since fuel burns at a somewhat constant rate, the space between power strokes becomes more exaggerated.

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Old 03-21-2019, 03:59 PM
jeff18 jeff18 is offline
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Default Re: Using too high of a gear

I changed my search terms and included the word "transmission" in it and this is what came up. Pretty definitive and makes sense.

"Lugging an engine is like hammering the engine parts with every explosion in a cylinder. It racks on the rod bearing/journals, makes the pistons slap the side of the cylinders hard, and if is done enough, could probably break piston rings. It also creates a hammer effect all the way through the drivetrain. There are springs in the friction disk (of the clutch) which takes up some of this hammering, but they will only take so much before they wear out as well. This causes premature wear all the way around. It's not like it will wear out tomorrow, but it will cause wear over time. If you want your car to last a while, you don't want to be doing this. "
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