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?


Modified by kantfadedisazn at 7:29 PM 9/7/2006

 

I've heard they jump to about mid 11 cr, who knows...

 

wow need help on this one

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiR Inspired ED7 &raquo;</TD></TR><TR><TD CLASS="quote">I've heard they jump to about mid 11 cr, who knows...</TD></TR></TABLE>

yeah but why would the ctr be better than the itr if the stock engines allone dot yeild that cp ratio?

 

can anybody help explain , cuz i dont know whitch pistons to go with

 

http://www.zealautowerks.com/

 

Internals... Crank bla bla are different size.. Even a gsr with a b16,gsr, type r etc... head would change the cr of the motor **** idk! lol bump!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiR Inspired ED7 &raquo;</TD></TR><TR><TD CLASS="quote">Internals... Crank bla bla are different size.. Even a gsr with a b16,gsr, type r etc... head would change the cr of the motor **** idk! lol bump!

</TD></TR></TABLE>

i know right very confusing thats why i really want to find out so i dont put the wrong thing in and have a crazy high compression and blow my engine by using pump gas.

 

Its not that confusing.....using ctr pistons only in a B16A assembly will yeild you 11:1 compression, equal to that of the JDM B18C type R. It works fine, and many people do it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kantfadedisazn &raquo;</TD></TR><TR><TD CLASS="quote">

i know right very confusing thats why i really want to find out so i dont put the wrong thing in and have a crazy high compression and blow my engine by using pump gas.</TD></TR></TABLE>
You build it take it to get tuned

 

just did the compression calculator from zealautowerks and this is what the results were http://www.zealautowerks.com/

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

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kantfadedisazn &raquo;</TD></TR><TR><TD CLASS="quote">just did the compression calculator from zealautowerks and this is what the results were http://www.zealautowerks.com/

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



</TD></TR></TABLE>
does that sound right

 

because the ctr is a 1.6 and the itr is 1.8 a smaller engine producing almost 200 hp needs the high comp as in the itr its almost the same thers really no diffrence the ctr pistons in my book are better