Using a gear at too low revs.... - Alfa Romeo Forum
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Using a gear at too low revs....

I tried googling this but couldn't get any relevant search results, what actually happens to the engine etc, when you labour it?

I hope that's the correct term for when you change into a gear when the revs are too low and so it takes a while for the revs to pick up before it's in the right rev range...
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Re: Using a gear at too low revs....

The reversal of stresses on the crank can have the effect of adversley damaging the big end shells, as the wieght of the car is effectively trying to brake the engine, it's no different in theory to engine braking (using the engine to slow the car) but with that the crank is constantly bing pushed against, when labouring the crank is loading and unloading constantly against the bearing shells, this hammers them , but unless your driving at every speed in 5th then it's not going to be that detrimental to the engine though parts connected to it can shake themselves to bits from the vibration.
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Re: Using a gear at too low revs....

Apart from burning more fuel not much really it might put a bit more strain on the bearings i.e low revs low oil pressure but i think this may have to be a pretty common occurence to have much effect
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