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Join Date: Feb 2008
Location: United Kingdom
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.