Hi, I was trying to calculate the compression of some piston that someone suggested would be 12:1 in a particular setup. When I use the calculater I don't get that compression, so I need someone else to do it for me in case I did something wrong. Here are the possible specs:
Pistons
Comp. Height: 1.1805
Bore: 3.3465/85mm
Dome: +2cc

Engine
85mmx87.2
B16 head
Rod length: 5.433/138mm
Stroke: 3.433/87.2mm
Block Height: 7.992/203
Head cc: 42.7
No milling
Elevation: 62 ft above sea level
revs: 9500

 

I got 10.9:1 with an oem 3 layer headgasket. Is that figure correct?

 

yep, based on the numbers you gave, I got 11.056:1