ok i have a jdm b16 and i wanted to change the pistons to ctr, but people are saying running thse pistons will yeild crazy compression ratios, but i have a compression calculator and it doesnt nearly come close to what people are saying. they say run itr pistons, but what i dont understand is that if the jdm ctr angine itself has a 10:8:1 compression and the itr has a 11:0:1 compression, why would the ctr pistons yeild higher than the itr pistons?

 

could possibly have to do with the Itr having a longer stroke.

 

the ctr's have a higher dome and come to more of a point taking up more space and raising the compression, and remember pistons will make different #s depending on your set up.

 

just did the compression calculator from zealautowerks and this is what the results were ZealAutowerks - Honda Compression Calculator
Block-B16A
81-Bore (mm)
77.40-Stroke (mm)
203.25-Deck Height (mm)
Head-B16A
42.70-Combustion Chamber Volume (cc)
Piston-PCT (JDM B16B)
8.63-Dome (cc)
30.73-Comp Height (mm)
Connecting Rod-B16A
134.00-Rod Length (mm)
Headgasket Thickness-OEM 3-layer
0.02600000-Thickness (in)
0.00-Bore diff (mm) *
Maxium Operating RPM-8000
Elevation-fl which is 100ft
Results
Static Comp Ratio-11.91: 1
Effective Comp Ratio-11.89: 1
Displacement-1595.55cc
Rod / Stroke Ratio-1.73
Piston-to-Deck Height-(-0.007)
Mean Piston Speed-1713fps
Max Piston Acceleration-114842fps2

 

I want to explain it, but it hurts my head thinking about it. If i find the link again i'll post it here.