JdcTypeR

iTrader: (19)

Hello, just wanted some opinions on these pistons please for a 2.5 build, what power can these run safely, are they a noisey piston?
Any input welcome
Thanks

Alan Jeffery

Well over 500 bhp, no bother at all on a 2.5. Not noisy if machined properly.

jura11

iTrader: (7)

You can have look for CP pistons or better Wossner.



Jura

Apostle

I've gotem in MY08 Hatch Sti - no noise at all.

Apparently slightly higher/taller skirt on piston than some = v good for a road car / longevity.

Had mine done by the man above....


Hmmh... no not HIM, lol

but the one and only Alan Jeffrey above / down at Enginetuner - very professional outfit.

NB. - there again some consider AJ a tuning god lol lol.

A

JdcTypeR

iTrader: (19)

Thanks for the replies everyone, are cp better than wiseco?

jura11

iTrader: (7)

Personally i would go for Wossner(at mine 2.1 stroker build will be Wossner),CP are good and great price too.



Jura

dazdavies

iTrader: (22)

Wiseco/Cosworth all day long they are not used in most big power builds for no reason.

JdcTypeR

iTrader: (19)

If i ordered standard size forged pistons 99.5mm as the block is good would all i need is a hone as i was going to go oversized but i'm getting different views on this as some are saying oversized to 100mm would be ok but then i get differing views stating that the ej257 cylinders are thin anyway and could compromise reliabilty?
Would i need to be setting the ring gaps aswell?
Cheers.

JdcTypeR

iTrader: (19)

Anyone whos done a 2.5 build?

MOTORS S GT

iTrader: (2)

Check for bore ovality as the 2.5's are more prone to it than the 2.0, if the bore needs correcting then go for 99.75mm pistons, which in the future you still have an the 100mm option, yes the bore walls are thin, but there's plenty of 2.5's out there running 100mm bore without problems.

Always check ring gaps on build, never trust anything out the box.

B0DSKI

iTrader: (17)

Agree with Daz, Cosworth are the way to go