FA20 OEM pistons, are they Forged or Cast ?
 

any idea ?

Aren't most modern components cast?

Almost a 100% sure the pistons should be cast. Can't think of a reason to be otherwise, and cast are a lot cheaper.

yes most engines has cast internals.

i would agree most cars now a days have cast pistons

2JZ had cast pistons, why the hell would this one get forged?

Perhaps the question would be better suited on the con-rods and crank...

Tip: Better to beef up the bottom then waste time at the top. More likely to throw a con-rod out the side of the block then melt a hole through the piston (unless you do something really stupid with the fuel).

The ej207 comes with forged pistons.

the EJ25 comes with forged rods.

i was talking about EJ207 the 2.0 engine found jdm sti

As pointed out, it does not.

I will bet you many things that it comes with hypereutectic pistons. For the uninitiated, hypereutectic pistons are cast.

i thought EJ207 and EJ255 and EJ257 stopped using forged internals other than the crank after V7. And all recently built performance EJs from the factory where cast rods and pistons.

I don't recall specifics, but I know for a fact that the V7 EJ207 was the last with forged pistons. I just don't recall any engine EXCEPT the EJ207 getting forged internals. Even if the EJ257 or EJ255 have forged rods, they're decent, but nothing to write home about. I'd have to check NASIOC to be certain, but I'm fairly sure I'm right.

HomemadeWRX would know off the top of his head.

The last relatively inexpensive naturally aspirated production car I can think of that came with forged pistons and rods was the S2000.

Quite a few modern cars come with forged pistons; the GT-R being one of them. It wouldn't be a terrible surprise if the FA20 came with forged pistons, but only if the overall price of the car was higher.

The Evo X has forged Mahle pistons. Yum. But I'm pretty sure these are just cast. However, I know I saw somewhere that the rods and crank are forged steel...

OEM cars with forged pistons are generally forced induction from the factory. It's more common to see forged con rods & crank on an N/A car than forged pistons.

I just wish Toyota surprises us with this engine, and we discover that it holds boooost! :D

Senior Scion rep here when asked said that a S/C would not be a simple bolt-on, because of the high compression ratio the pistons would have to be changed. Sounds like mucho $. He did say Toyota has plans though.

Not enirtly true, most trd superchargers run low boost, 5-6 psi is expected, 250 hp...

But if you have weak ringlands on the piston it's another story.

Interesting. If it's a dealer install, I assume it will not void our warranty?

Of course depending on where the added 50 or lbs go adding a S/C may require re-optimization of springs/shocks, so that would get expensive too.

http://www.ft86club.com/forums/showthread.php?t=6840

im pretty sure they are cast, they look cast in this picture

most likely cast, the car is the too cheap for it to have forged.

Probably cast, however most if not all modern Toyota 4's (yes yes, I know, Subaru, blah blah blah) come with forged cranks. I don't expect this to be any different.

Nothing voids a warranty, however, the dealer may elect not to perform a warranty repair based on perceived abuse and/or modification.

Whether a supercharger carries a warranty depends on a few factors: if it only requires a re-flash of the stock ECU, doesn't use an external intercooler, doesn't require modification/replacement of stock exhaust manifold, and passes California Air Resources Board (CARB) certification, it will be included in the powertrain warranty. If it doesn't, it'll be a "race-only" part for off-highway use only and not carry a warranty no matter where it is installed.

However, if they say it won't be a simple bolt-on, they might as well release it as a separate model.

:lol: C'mon. This kinda talk is getting silly.

Just Aluminum Alloy cast.
Side skirts have a resin coating.
The Top ring groove has a alumite coating.
http://www.141motors.com/86/pistontop.jpg

The crankshaft is forged steel

Ishii

Even though this quote is very old. All of the USDM STI's comes with forged rods and and a forged crank.

my 130hp 5sfe had a forged crank. which is handy when building a stroker 3sgte using said 5sfe crank. :D

i'm sure the crank on the FA20 is plenty durable.

That is correct. The pistons are most likely hyperutectic type, which stronger than normal cast aluminum and expands much less. This is good for emissions, and plenty strong enough for NA engines. This is the same type of pistons used on the STI/WRX.

Realistically, pistons are not going to be a problem until we add boost. Even with 1000RPM more redline, I bet these will do just fine.

I'm with Jeff on this one. Knowing Subaru, who did the engine, they'll be hyperutectic...which looks to be the case with the photo posted up above.

Can't wait to get my engine here so I can start working up the internals.

-Micah
'Homemade WRX'

Watch this space :D

Nice info
 

Well done on a very good post, facts and images!

waiting for pistons and heads to land on my bench...driving me nuts.

double post

Do you have the shortblock though? :O Any details? :D (cough cough rod length)

Ishii Motors had rods out in another thread. He may know.

Cheap rods
 

Hey man I'm so upset right now. I just got myself a turbo kit installed and after a boost leak test drive the mechanic noticed a clicking sound. Took the oil pan out to check what's going on and he found that one of the rods are bent. It's upsetting. 25 day until I come from my deployment and I come home to a brand new broke car...
Gent's if you boosting your car change your rods get some forged rods installed because this sucks. Now the engine has to come out and all that good stuff...

Oh and the car is on a base map so is pushing 300-350hp so nothing crazy
:bonk:

What?