4AGE reliability on oversize piston

[benjaminn78]

Dear forumer sifu,

since my engine still pending at workshop waiting for the forged piston, i would like to ask, there is maximum 82mm oversize piston produce by TODA that has been use by some forumer, and there is no problem with the relibility. Now i got the news that there is a forged piston size 83mm for 4AGE. i would like to know has anyone who has rojak their 4AGE with other car with 83mm piston? mind to share your experience?..

 

[nappx]

aiyah...83mm...first at all i never do...even oversize piston..just run stock piston...what i can think is..about the engine reliability...how about block itself..the distance between hole..

good discussion here..

 

[scottwrx]

my fren tried a 83mm piston from mazda on 7age, pump up to about 1930cc facing some cooling issues, need to change double layer radiator and add oil cooler as for clearance between holes, no prob.., if u wanna play oversize piston, better install a water temp meter with warning beep.. to be on the safe side mah..

 

[benjaminn78]

i already have the oil cooler and 2 row aluminum radiator...so beside cooling, have you friend facing other problem?

 

[1JZtezza]

Hmmm very interesting topic...anything is possible...devil is in the details.

Can not remember if you could just bore it out or re-sleeve original block.Anyways make damn sure it is centred correctly over each con-rod journal on the crank.This is actually the hardest part;to get a machine shop to do to very fine tolerances.

Next is the piston pin hole relative to original piston.Two ring(racing) or three rings.If can, get the three ring piston.

What head?16v or 20v and whether the pistons got the relevant 'cut out' for the valves and got to check for valve clearance;more so if you are using hi-lift cams.Want to be greedy go 304/304 but stay standard lift(16v) plus valve springs.TRD bearings

Balance all the stuff,increase your injectors which means add performance ECU.PNP, bigger extractor

Remember change con-rod bolts.

11000rpm screamer on the way!!!good luck!!!

---------- Post added at 09:48 PM ---------- Previous post was at 09:46 PM ----------

ps. get the TRD oil pump(drive and driven gear).Dry sump is obviously better but damn expensive.

 

[benjaminn78]

ok, this is what i have done as far....

Head (Has complete)

-PNP head
-TODA 288/9.2 CAM (IN/EX)
-TODA Valve Spring.
-Reshim
-TRD metal head gasket (if state on 82mm piston), other wise need to custom 83mm gasket. also from WESLEE RACING.

Block (still decide which piston to be go)
- Ori 20V BT block bore to 82mm or 83mm....
- WESLEE RACING oversize forged piston ( still decide 82mm 0r 83mm)
- AE101 conrod with ARP bolt
- KINGS Racing main and conrod bearing
- Crankshaft to be balance after putting all the piston and clutch.
- WESLEE RACING lighten pulley...5 pieces per set.

so any other sifu can share the oversize piston experience?

 

[TRD.AE92]

bro... I done this before...
4AGE + TX3 piston (83mm)..
Long lasting? ermmm... I don't think so.... I use only 3 month, then the block cracked.... Everyday drive about 100km...

My mechanic car... Using this piston as well, but end up... block cracked in 6 month.

So... you still want to go for it? Think by yourself la... no offence


But I do have use the 4AGZE with 82mm piston, and boosting 1 bar with SC14 charger... and even used for 4 year without any problem occur.

 

[benjaminn78]

as the conclusion, seem 83mm cant be last long due to thinner wall block crack...thanks sifu,

 

[linkeong]

According to one of my mech he said 83mm should be able to last long but your ECU tuning need to be ultra fine. There is one in Perak with 83mm, sometimes he goes to dato sagor track

 

[benjaminn78]

According to one of my mech he said 83mm should be able to last long but your ECU tuning need to be ultra fine. There is one in Perak with 83mm, sometimes he goes to dato sagor track

Wat aftermarket ECU did he using?

 

[TOMee90]

ok, this is what i have done as far....

Block (still decide which piston to be go)
- WESLEE RACING lighten pulley...5 pieces per set.

so any other sifu can share the oversize piston experience?

hi bro, wud u mind to tell me, how much it cost u for d WESLEE RACING lighten pulley? n where can i get it?

thankz.......

 

[benjaminn78]

hi bro, wud u mind to tell me, how much it cost u for d WESLEE RACING lighten pulley? n where can i get it?

thankz.......

you can check through this link

http://www.zerotohundred.com/newfor...04104-performance-pulley-for-4ag-engines.html

http://store.keganiautotech.com/index.php?main_page=product_info&cPath=2&products_id=91

 

[nappx]

got diff or not if used svt or bt block

 

[linkeong]

Dont bother with the WESLEE pulleys, they are exactly the same ones with GPW. Same weight same material even looks very very similar and you can get it for cheaper at subang. That guy uses emanage ultimate only if not mistaken, need to reconfirm with me mech

 

[cybtech]

my point of view... dun be too greedy...
if anything happens... (touch wood) you'll regret it...
just go can move, have fun driving, and save money... economy crisis here...
of course, unless you're going to track la, using engine pakai buang.....