b20vtec compression

[brian11to1]

Someone please help me figure out my compression...

I'm building an 84.5mm B20VTEC.

B20B Block
LS/B20 Rods
LS/B20 Crank
84.5mm RS ITR pistons
3 layer OEM headgasket
Supertech flat "race" valves
GSR head which has ported/polished will flow right around 280-285cfm

Can anyone help? I've heard numbers all the way from 11:1 to 13:1, I just really wanna know.

 

[xips(86CRXSI)]

Go here, ZealAutowerks - Honda Compression Calculator

and you need to know if your pistons are usdm or jdm Itegra Type R.

 

[brian11to1]

Go here, ZealAutowerks - Honda Compression Calculator

and you need to know if your pistons are usdm or jdm Itegra Type R.

something tells me thats not going to be very accurate.

 

[xips(86CRXSI)]

did you try it?

 

[brian11to1]

Ya, 13.5 and everyone I talk to says thats not even close to being accurate. Since I guess the calculator still assumes the pistons are 81mm going into an 84.5 bore.

I didnt say its wrong as a fact, I expressed an opinion about it possibly being wrong