piston dome cc figure

[Bean]

I've been on another hunt through google's cache as club4ag is either still down or I just can't access it anymore.

came across these two tables don't know which is more accurate yet as I haven't ran the numbers and also lack a bit info for better accuracy.

ok i just cant find the info i need so i will assume that the piston compression height is the same on all 4ag motors (1.171"). i also used oldskewltoy's 16v measurement for all the 16v heads at 36.25ccthis is using a bore of 81mm deck height of 191mm stroke of 77mm and a head gasket of 1.2mm and a rod length of 122mm
motor---------oem CR---------head cc------------------------------------------dome cc
4agze (BP)--------8:1-------35-39cc-------------------------------------------- -10.39
4agze (SP)------8.9:1-------35-39cc-------------------------------------------- -3.87
4age (BP)-------9.4:1-------35-39cc--------------------------------------------- -.9
4age (euro)-----10:1--------35-39cc-------------------------------------------- 2.25
4age (SP)------10.3:1-------35-39cc-------------------------------------------- 3.65
4age (ST)------10.5:1-------34.5cc (according to arias)--------------------- 2.8
4age (BT)--------11:1--------37.8cc (measured by Sam_Q)----------------- 8.19
if any one wants to contribute a more accurate measurement or if i find something new then i can and will recalculate this info thanksi have noticed that arias pistons adds .018" in piston height to the 20v pistons.

AND THIS

here are my final calculations:Quote, originally posted by ga_goosh »ok so here is a new chart with updated specs that i have found on the internet and other members here. I also updated all the 16v engines with 36cc chamber volumeAdvertised compression ratios BP=9.4:1 (euro)BP=10.1:1 SP=10.3:1 ST=10.5 BT=11.1:1 advertised head CC 16v=36cc 20v ST=34.5 20v BT= 37.8cc
Engine-----------OEM CR-----headCC--------Piston heigth-------------piston dome:
4agze (BP)---------8:1---------36cc---------------30mm----------------------- -11.9
4agze (SP)-------8.9:1--------36cc----------------30mm---------------------- -5.45
4age (BP)--------9.4:1--------36cc----------------30mm----------------------- -2.5
4age (euro)----10.1:1--------36cc----------------30mm----------------------- 1.15
4age (SP)-------10.3:1--------36cc---------------30mm----------------------- 2.1
4age (ST)-------10.5:1--------34.5cc ------------30.5mm--------------------- -1.1
4age (BT)-------11.1:1--------37.8cc ------------30.5mm--------------------- 4.7
looking at old post i found that the ST has .2" taller comp heigth. so the compression heigth is 30mm for the 16v and 30.5 for the 20v (this info from dr.occa from a previous post) the previous chamber heigth number 1.171"(29.7mm) is from ares and is actually what ares uses as there chamber heigth. the BT comp heigth is at 1.202 (30.5mm) provided by gaijin_rokurunner...thanks gaijinthanks sam_Q for posting your bt20v chamber volumes and oldskewltoy for the 16v chamber volumesI think these are as acurate as i can get with out actually measuring the pistons. now you can figure out what compression you want and chose the oem part that gets you there. You can test dynamic compression with a more accurate numbers to choose the right cam for your setup i have been searching for the piston specs for a 4age like the dome cc and the compression heigth. i am wanting to play around wth compression numbers but i dont have the specs of the pistons. if some one has these LMK thanks.looking for bluetop big port, redtop small port silvertop and blacktop Modified by ga_goosh at 3:07 PM 7/17/2012