Fundemental car question

73 Mustang Boy · 10-03-2001, 04:56 PM

I am an mechanical enginering major at Georgia Southern University and by no means an expert. I think that all other things beeing equal, 2 motors with the same displacement, one with long stroke and small bore the other with short stroke and large bore, should produce the same amount of torque if both motors have the same efficiency. But, the longer the stroke on a motor the faster the piston has to move up and down the cylinder (I'm sure there is a limit on how fast that can be before something breaks). The larger bore would increase friction in the bore but not piston speed. In either case the increased friction would cause more heat in the motor lowering its max RPM. I personaly think it would be better to modify the stroke on an engine. This would maintain the effiency of combustion in the combustion chamber since the cylinder heads were designed with a specific bore in mind. Someone feel free to correct me if I am wrong because like i said I have no clue, just guessing from current knowledge.

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10-03-2001, 04:56 PM	#1
73 Mustang Boy Registered Member Join Date: Aug 2001 Location: Georgia Posts: 84	I am an mechanical enginering major at Georgia Southern University and by no means an expert. I think that all other things beeing equal, 2 motors with the same displacement, one with long stroke and small bore the other with short stroke and large bore, should produce the same amount of torque if both motors have the same efficiency. But, the longer the stroke on a motor the faster the piston has to move up and down the cylinder (I'm sure there is a limit on how fast that can be before something breaks). The larger bore would increase friction in the bore but not piston speed. In either case the increased friction would cause more heat in the motor lowering its max RPM. I personaly think it would be better to modify the stroke on an engine. This would maintain the effiency of combustion in the combustion chamber since the cylinder heads were designed with a specific bore in mind. Someone feel free to correct me if I am wrong because like i said I have no clue, just guessing from current knowledge.