4AGE 16v N/A project

[Project D]

[Walaki]D`Lair Wrote:The cams has nothing to do with the compression...

more duration = less dynamic compression :wink:
for Toda 264 in/ex -> you need 11.5:1 (compression ratio)

with tomei poncam (264° too, but more agressive ) you need 12:1

you don't have totally wrong because the goal is to have 14bar (real compression)

I have formulas to calculate the dynamic compression, if you want it -> PM :wink:

[tolisspi]

The CR in stock engine is 9:1 or in some case 10:1 and the compression 185-185-185-185 arent they?
Now the CR have to be according to the data of the TODA high compression pistons 11,3:1.
As for the cams i hadnt the paper of the TODA (i didnt find something) and i had order the cams only with dutation and the lift. I didnt know the that cams have regard to the CR.
Upload trhe papers of TODA's cams in which i had order regard to my CR 264(IN) and 256(EX) and lift 10,3.
Now i have 272 (IN&EX) and thats meaning i had to have 11,8:1 and 12:1 CR.
Is that a big problem?


Bad bad english

[Project D]

stock CR (compression ratio) = 9.4:1 for the bigport and 10.3:1 for the smallport (10.5:1 silvertop /11:1 blaccktop) from technical data (4age masterbook).
the lift change nothing for the dynamic compression :wink:

185-185-185-185 ?! I think you confuse with injectors (185cc)

I search the exact volume of the stock combustion chamber (with the stock head gasket) and the volume of the cylinder head alone, so if someone have this...


PS: for people who have sent me a PM, I will send you the formulas (Excel) as soon as I finished to translate into English (in French I think you go not understand )

[tolisspi]

Compression pressure is 12,5bar or (181 lbf/in2)
With the set up that i have, how much CP have i?
Send me pm the formulas

[Project D]

12.5bar -> something like 8.34:1 (dynamic compression)
but you can not from a pressure to get a compression ratio.
sorry I'm not good enough in English to explain why.

the only way to know your compression ratio is to measure the volume of your combustion chamber :wink:

The formula to know the compression ratio is:
(V+v)/v
V= volume at BDC. (396.78cc for a stock 4age with Ø81mm piston)
v= volume at TDC. Your combustion chamber in cc (47.24cc for a stock engine with original head gasket)

(396.78+47.24)/47.24 = 9.4

The formula for "static" compression ratio is realy easy, but the one for dynamic compression ratio is realy not simple

that why i make this for you:
Dynamic compression ratio calculator
Enjoy

[tolisspi]

Im back!

So i decided to replace the TODA cams (i ll keep them) with the stock cams because i cant find a standalone in good price. Im thinking that it ll cost me 1500 euro and i have to do other things like that i "discovered" water on the back (5th door place) and i have to find the problem. Also i found a hole on the exhaust muffler and maybe i ll change the whole exhaust from the headers up to muffler. I have to replace the protection on the floor of the car for the rust (i dont know the word of the material) too and some things to do for small parts of rust on the driver's door, the co-driver's pillar sand somethings else.
I had some problems with fuel pump and i replaced it with bosch 044 (and whole system of the hoses bigger diameter) and for a moment i had problems with ignition system (the engine didnt start) but i have done a stupidness with the one of plugs of ecu!!!
Some pics



And a last video