OP's recipient car is an 2000, B5244S.
The 1999 was a B5254S, same displacement as the B5244S.
I don’t have the stroke, bore and compression ratio for the B5254S.
Engine displacement is the swept volume of all the pistons inside the cylinders of a reciprocating engine in a single movement from top dead centre (TDC) to bottom dead centre (BDC). Engine displacement does not include the total volume of the combustion chamber.
Compression ratio it is the ratio between the volume of the cylinder and combustion chamber when the piston is at the bottom of its stroke, and the volume of the combustion chamber when the piston is at the top of its stroke.
Engine Compression ratio = (Engine displacement + Total Combustion chamber volume)/ Combustion chamber volume.
B5234T3 Engine displacement = 2319cc. Compression ratio = 8.5:1 .
Compression ratio = (2319cc + X)/X = 8.5
(2319+x)/x-(8.5)=0 :Move all the terms to the left.
(x+2319)/x-(8.5)=0 ;add all the numbers together, and all the variables.
(x+2319)/x-8.5=0 ;add all the numbers together, and all the variables
(x+2319)-(8.5)*x=0 ;multiply all the terms by the denominator.
(x+2319)-8.5x=0 ;multiply parentheses
x-8.5x+2319=0 ;get rid of parentheses
-7.5x+2319=0 ;add all the numbers together, and all the variables
-7.5x=-2319 ;move all terms containing x to the left, all other terms to the right
x=-2319/-7.5 = x=309+1/5 = x=309+0.2= x=309.2cc
(2319+309.2)/309.2 = 2628.2/309.2 = 8.494/1 = 8.5:1.
Total Combustion chamber volume for the B5234T3 = 309.2 cc.
Using the same math as above:
Engine displacement = 2435 cc
Compression ratio = 10.3:1
Total Combustion chamber volume = 260.538 cc
B5234T3 with B5244S head.
Compression ratio = (2319 + 260.538)/260.538 = 9.900 = 9.9:1.
PS: Found the compression ratio for the B5254S, 10.5 : 1 . Cylinder diameter is 83 mm.