Like the title says...

What are the lightest rods and pistons avail for the EJ257. Was looking around but couldn't really find what I was looking for.

well, I will put money that you won't find them on a manufacturers shelf...
i.e. my 4" bore pistons weigh in at 408 grams made from JE 2618 slugs and there is still weight to remove ;)
wiseco's have the lightest forging, whether you find that good or bad though...

I've still only made bomb proof pauter rods so, those are going to be the lightest by a long shot. Still need to order my lightweight rods (two different ones) to see what they come out as.

This thread covers piston weight for a bunch of different pistons...

http://forums.nasioc.com/forums/showthread.php?t=999055

^^^^good stuff!

I was about ready to come in a post my thread link :lol:

for the lazy:

Ive decided to buy some Mahle pistons for my STi. not cause i have to....yet :rolleyes: :lol: . But i prolly will sometime. Ive gathered some info on these pistons. I specifically wanted piston/pin weights for my own pleasure and thought i would share them w/ all you. check out my other thread from awhile back: http://forums.nasioc.com/forums/showthread.php?t=964607&highlight=piston+dish+comparison
Some info taken from: http://forums.nasioc.com/forums/showthread.php?t=630797&highlight=Sti+piston+dish
Some info taken from their websites and/or emails recieved from them:

Stock STi:
piston weight: 414 grams
pin weight: 152 grams
dish: -22 cc
Compression Ratio: 8.2:1
www.airpowersystems.com was where i recieved this info.

Mahle:
piston weight: 399 grams
pin weight: 123 grams
dish: -22 cc
Compression Ratio: 8.5:1 cncmotorsports.com was where i recieved all the rest of the info.
Compression Ratio: 8.5:1 says Tony Ford at Mahle...via email

Crawford performance CP piston
piston weight: 399 grams
Pin weight: 166 grams
Compression Ratio - 8.2:1
Dish – 21cc
Info provided by Chris at crawford performance

TechWorks piston:
piston weight: 374 grams (ultralite version)(start as wiseco slugs) unkown bore
piston weight: 100mm bore 376g
they claim: up to 100 grams weight reduction (piston/pin combo)
pin weight: 111.6g "ultralight" weight piston pins (is what techworks call them)
compression ratio: did not specify compression ratio. most likely 8.2
piston dish:-22cc

Wiseco pistons:
piston weight 371 grams
piston pin: 140 grams (heavy duty pins...possibly an option/upgrade?)
piston dish: -19cc
compression ratio: 8.9

Arias:
piston weight: 374 grams
pin weight:
compression ratio: 8.3
piston dish: -23.3

Axis Power Racing designed CP pistons
piston weight: 398 grams
pin weight: didnt know...will weigh one tomorrow
compression ratio: 8.2:1
piston dish: -22 cc

Cosworth pistons
piston weight: 399. 54 grams
pin weight: 121 grams
pin lock weight: 1 gram
compression ratio: 8.28:1
piston dish: 20.2 cc

Cobb tuning pistons
piston weight: 371 grams
pin weight: 131.2 grams
pin lock weight: 1 gram
compression ratio: 8.5:1
Inverted Dome Depth: .165"
Info provided by Jeremy from cobb tuning
from Cobb's website: "start out as JE low-silicone aerospace aluminum alloy forgings"

I have emailed:
cobbtuning.com
axispowerracing.com
crawfordperformance.com
techworkseng.com
cosworth.com

WE WILL SEE WHO RESPONDS AND GETS AN 'A' FROM THE SUBY COMMUNITY

Thank you for responding to my emails and providing info freely:
-Axispowerracing.com...thankyou Ron
-cosworth.com
-Crawford Performance pmed me even though they did not recieve my email. Thanks Chris for going out of the way and providing me the info.
-Tony Ford from Mahle wrote back to me and gave me the compression ratio for their pistons.
-Techworks engineering wrote to me and gave me all their specs. thanks guys!
-Jeremy from Cobb tuning answered my pm...thankyou!

note: the information here was taken off of the companies websites, unless otherwise specified.

If you want some aluminum rods shoot me a PM/e-mail. ;) They won't last as long as Carrillo H-Beams etc. but you asked for lightweight...

If you want some aluminum rods shoot me a PM/e-mail. ;) They won't last as long as Carrillo H-Beams etc. but you asked for lightweight...

yup...some grodens and a source I have for Ti rods are the next two on my test list :D