Mark A

iTrader: (1)

I've been offered a very good deal on forged CP, these uprated pistons for the 2.5 US STi engine come complete with pins.

http://www.cppistons.com/PDF%20Files/CPImport.pdf

Anybody wanting that extra level of safety or the ability to rev over 7K rpm should consider these pistons as an upgrade before installing their engines.

I really need to purchase 10 sets for it to make sense as a groupbuy.

I think the final price would be in the region of £350 !!!

Please add your names below if you are interested.

I should also be able to get pistons for the EJ20, but will check first.

BW Mark A

Mark A

iTrader: (1)

Bump

Mark A

iTrader: (1)

Bump

drb5

iTrader: (4)

if only i had a 2.5 sitting there m8, i'd put my name up

David_Wallis

i would be changing rods to rev abouve 7k and also playing with heads..

You can risk 7.2 at a push on oem on the 2ltr..

drb5

iTrader: (4)

it's a hard decision innit?

Ive595

How about rings?

Ive

Mark A

iTrader: (1)

Rings would be extra but pins are included.

DRB5, not really its just a matter of money

Mark A

drb5

iTrader: (4)

bein funny, bud

Mark A

iTrader: (1)

Come on drb5 what are you running, I can't remember, but I'm sure it could do with some shiny new pistons

Mark A

drb5

iTrader: (4)

lol i am running uprated internals in the rb, but my project(if i ever get it) could/will defo need some nice light, shiney bitz dunno what size though

Andy.F

IIRC the CP's use the OE rings you would be taking off the unused std pistons.

Mark, do you know if these CP's are a 'drop in' to the std bore ? and if so, what clearance would they run with ?

Andy

drb5

iTrader: (4)

if mark cant help, i'm sure these guys can

http://www.cppistons.com/

Mark A

iTrader: (1)

Andy I will check with the supplier tonight.

Mark A

john banks

Same question as Andy, if they pop in to a standard bore with a sensible clearance that won't pick up when hot, then I'll have a set.

Mark A

iTrader: (1)

John and Andy

"The CP pistons run a .0035 inch clearance."

A bit more information is available here as well

http://www.cppistons.com/sCompactNEW.htm

Mark A

Mr J

btw is this the new CP piston that is shaped just like the stock one ??



Jan

Mark A

iTrader: (1)

I believe so with the square dish in the center, but I will check.

Mark A

john banks

So is it 3.5 thou drop in without a hone, and the CR is 8.2 with which heads and headgaskets?

Mark A

iTrader: (1)

Hope this answers your question John, if not let me know.

The pistons are a drop in with .0035" clearance based
on the biggest stock sti piston. That would mean the
clearance would not be larger than .0035". It might
be slightly tighter, say maybe .0005-.0007 but not
anymore than that. Subaru runs a factory clearance of
just .0004, but that's with hyperuetectic pistons that
do not swell up at all.

CR is 8.2:1 with stock thin ej257 gaskets and sti
heads. The us sti heads and wrx heads both have a
chamber volume of around 52cc. I think the other
version sti heads are similar. If you use my Cometic
gaskets, the cr drops to right around 8.0:1.

Mark A

drb5

iTrader: (4)

mark
how do these compare to the likes of je, where they tend to expend when get too hot? and do we think the gb will go ahead?


oh and also, what about rods? any idea's? or would i be as well just trying to get it all meself and hope not to pay any taxes?

Mark A

iTrader: (1)

DRB5

A couple of people have shown interest in the pistons. I'm going to do another GB of engines soon, so I had planned to have it all delivered on the same pallet. Even if only two people buy pistons then I'm happy to sort out the importing. The price would be very slightly higher but only £10-20 per set. I would imagine that if they got too hot they would expand. I was given a price for the rods but its at home

Mark A

john banks

Excellent info Mark, yes I would like a set please.

Mark A

iTrader: (1)

Ok John

I will order a couple of sets with the next GB engines. Would you want standard rings for an extra $100.

drb5 FYI the rods would be made by "Oliver" the company not the person or musical.

Mark A

drb5

iTrader: (4)

not too info filled in this sort of area, so i can't give definate answer as to whether not i'd go for them.......but if they're good enough for john.......!

need to see if i'm going to 2.5 route or not though. when you doing the next short block gb?

Mark A

iTrader: (1)

As soon as I've collected all the money from the other GBs, so about 1-2 weeks.

Mark A

drb5

iTrader: (4)

k

will hopefully know by then if i'm defo going through with it

john banks

I can reuse the rings from the original pistons I believe Mark, so just the pistons and a standard EJ257 headgasket set is what I would need.

Mark A

iTrader: (1)

Should be ordering a couple of sets of pistons along with a couple of engines hopefully at the end of this week.

Mark

john banks

"CR is 8.2:1 with stock thin ej257 gaskets and sti
heads. The us sti heads and wrx heads both have a
chamber volume of around 52cc. I think the other
version sti heads are similar."

These are the ones I want Mark, along with EJ257 gaskets if possible.