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

[oldeskewltoy]

I don't recommend this to determine volume... but for verifying it...

http://www.rbracing-rsr.com/compstaticcalc.html

3.189 - 81mm bore
3.031 - 77mm stroke
.047" - 1.2mm head gasket compressed thickness
.015" - .38mm deck - depth piston edge is from top edge of block
36cc - 16V chamber volume

So doing what I said you shouldn't....
Engine-----------OEM CR-----headCC--------Deck heigth-------------piston dome/dish volume in cc
4agze (BP)---------8:1---------36cc---------------.38mm-----------------------11.7 dish
4agze (SP)-------8.9:1--------36cc----------------.38mm---------------------- 6.0 dish
4age (BP)--------9.4:1--------36cc----------------.38mm-----------------------3.06 dish
4age (euro)----10.0:1--------36cc----------------.38mm----------------------- 0(zero)
4age (SP)-------10.3:1--------36cc---------------.38mm----------------------- 1.5 dome


Give me a few weeks and I'll have a measured silvertop chamber volume for you....

[Bean]

I was hoping to get your input on this. What I'm also very eager to find out is dome cc. I will try to measure my spare pistons I have here but that's just one of many.

@Dan: I'll also start a thread on camshafts soon so if you find the time send me some of your collected data if you can.

@all: I'm currently motivated at pooling together all 4age related info so please chip in and I'll try my best to present it in orderly fashion once it's all there. This was something I was planing for a long time bit never got around to it. If it turns out nice it'll make for a good addition on the front page.

[ditn]

next week or so i will measure my AE101 4AGZE 3rd gen and post the info here i hope

[oldeskewltoy]

club4ag was down... collapsed on New years... although it was reported that the old stuff and members would be back... it does not yet appear that way. you will need to re-register. The info you scrounged for above is not yet back in the current club4ag

[Bean]

oldeskewltoy Wrote:club4ag was down... collapsed on New years... although it was reported that the old stuff and members would be back... it does not yet appear that way. you will need to re-register. The info you scrounged for above is not yet back in the current club4ag

Well as mentioned I'm currently motivated to gather the info back bit by bit with the help of the community and especially you, Jeff and Kenny - will try to get hold of Dr. Occa too as I think if we all work together we can get a well documented resource back together better than ever.

My own means of confirming and providing accurate data are limited but I'm happy to put in the time and effort to collect and present it once it's there.

This was something I planed long ago and might even go to the extend of a dedicaed webage for it so the data will never be lost again.

If this works as I hope it will regarding the 4age it can be extended beyond that and include suspension and other bit too in the future. But let's not get ahead too much and start with the engine.

[jdm86gtz]

oldeskewltoy Wrote:club4ag was down... collapsed on New years... although it was reported that the old stuff and members would be back... it does not yet appear that way. you will need to re-register. The info you scrounged for above is not yet back in the current club4ag

I tried get on it but couldn't and used the forgot my password link and I'm back on there now.