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This is the diameter of the cylinder hole in the engine block for the pistons.
this is the diameter of the cylinder hole in the engine block for the piston
Generally the nominal diameter of cylinder bore is kept little smaller at cylinder head than at the bottom. The engine head will be generally heat and it tends to expand for these high temperatures. To prevent the bore diameter at head to exceed diameter at bottom,piston engine bore is ground with a slight choke.
Enlarging the cylinder bore will increase cc's in a 2 stroke and ci's ina 4 stroke.....
For balance.
Oversquare
A Cylinder bore has no choke at all.
The bore refers to the Inside diameter of the cylinder. The Piston will be nearly the same diameter, with the piston rings making up the difference. Convert the bore to area by multiplying by pi and dividing by four, and multiply by the stroke and the number of cylinders and you have the volume displacement of the engine.
I assume you mean engine displacement? To calculate engine displacement, use this formula: Bore x bore x stroke x .7854 x number of cylinders.
If Measuring in mm, ( Bore x Bore x Stroke x .7854 ) / 1000 = cc's
I'm not a mechanic / technician but as far as I know that is where the engine cylinder bore is larger than the stroke
4.040". The standard bore is 4.00".