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brian11to1 · 11-13-2008, 03:42 PM

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) · 11-22-2008, 11:24 PM

Go here, ZealAutowerks - Honda Compression Calculator

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

brian11to1 · 11-23-2008, 12:36 AM

Quote:

Originally Posted by xips(86CRXSI)

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) · 11-23-2008, 02:41 AM

did you try it?

brian11to1 · 11-23-2008, 06:01 AM

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

11-13-2008, 03:42 PM	#1
brian11to1 Senior Member Join Date: Jan 2003 Posts: 9,000 iTrader: 2 / 100% Rep Power: 111	b20vtec compression 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. __________________ 90 Integra Sedan B20V 225 / 153 I DO NOT answer tech questions via PM. Use the forums!!!

11-23-2008, 06:01 AM	#5
brian11to1 Senior Member Join Date: Jan 2003 Posts: 9,000 iTrader: 2 / 100% Rep Power: 111	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 __________________ 90 Integra Sedan B20V 225 / 153 I DO NOT answer tech questions via PM. Use the forums!!!

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11-22-2008, 11:24 PM	#2
xips(86CRXSI) Senior Member Join Date: Aug 2005 Location: Portland, OR Age: 24 Posts: 105 iTrader: 0 / 0% Ride: 91 si hb gsr swap Rep Power: 10	Go here, ZealAutowerks - Honda Compression Calculator and you need to know if your pistons are usdm or jdm Itegra Type R.

11-23-2008, 02:41 AM	#4
xips(86CRXSI) Senior Member Join Date: Aug 2005 Location: Portland, OR Age: 24 Posts: 105 iTrader: 0 / 0% Ride: 91 si hb gsr swap Rep Power: 10	did you try it?

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