207 questions - Page 3 - Perth-WRX.com

Elrico · #21 28-03-2009, 07:08 PM

DJDINO · #22 28-03-2009, 07:17 PM

Quote:

Originally Posted by alexm

would the 2.2l end up costing more than the 2.5l do you reckon?

Posted this in another thread

Quote:

Recently spoke to Robin at PMS about doing a 2.2L stroker using a 207 CD block with ported heads (97 to keep my manifold etc) and a sti type cam or a 2.5L SCD with forged internals, the 2.5L option was $300 cheaper and was what Robin suggested as a better option for the track work I do. I think from memory it was about 6k for the short block and my heads exchange. All the hot japanese stuff like the S204 is still 2L, so I think I'd go the 207 route.

alexm · #23 28-03-2009, 07:25 PM

ah k
now i think im startin to learn a bit about the engines and stuff so a 2.5l will give me more torque. but the 2.2l will rev longer allowing more time for the turbo to be spooling? at least thats wat i think ive worked out now.

another question to do with the closed deck and semi closed which i know even less about lol is it possible to convert to a closed deck from a semi closed or is it actually a part of the block?
and ill do a search to find out how much boost a semi closed can handle safely.

Elrico · #24 28-03-2009, 07:25 PM

Sleeve the bores to solve the problems Its the jackets around the bores which are the decks i believe (im like you, still learning hehe) but am unsure if you can modify them to go from semiclosed to closed. I think you can add jackets to them which makes it closed decks.

Well there we go Lyndon :P. You putting a 2.5 in the banana boat?

Hurtenstein · #25 28-03-2009, 07:29 PM

Quote:

Originally Posted by alexm

ah k
now i think im startin to learn a bit about the engines and stuff so a 2.5l will give me more torque. but the 2.2l will rev longer allowing more time for the turbo to be spooling? at least thats wat i think ive worked out now.

another question to do with the closed deck and semi closed which i know even less about lol is it possible to convert to a closed deck from a semi closed or is it actually a part of the block?
and ill do a search to find out how much boost a semi closed can handle safely.

There are people on this forum running upwards of 2bar (30-psi) on their semi closed deck 207's.

You can weld in pieces between the bores and outer case for reinforcement yes, it's called dowling and i've got it done it to my 2.5.

trainwrex · #26 28-03-2009, 08:13 PM

Quote:

Originally Posted by Hurtenstein

There are people on this forum running upwards of 2bar (30-psi) on their semi closed deck 207's.

You can weld in pieces between the bores and outer case for reinforcement yes, it's called dowling and i've got it done it to my 2.5.

Fowling is not a good idea as it the bits around the bore that are not supported will fatigue. Sleeve or do nothing IMO.

DJDINO · #27 28-03-2009, 08:17 PM

Quote:

Originally Posted by trainwrex

Fowling is not a good idea as it the bits around the bore that are not supported will fatigue. Sleeve or do nothing IMO.

Having been down this path would you do a 257 with forged internals without sleeving or go a 207 stroked to 2.2 ?

EXPLICIT · #28 28-03-2009, 08:22 PM

Given your budget, stick with a 207 (2002 specification STI short block, 2.0L), its built to factory specifications and you know it'll last. 2.5L, dont waste your money, you'll spend your budget making one reliable for a start. 207 with ported heads, some cams, vf34 @ 1.6bar it will make horsepower, give you daily driveability and is noted as 'the' proven package.

alexm · #29 28-03-2009, 08:24 PM

ok done a bit of research and it looks like sleeving is a must for the 257.
probably another dumb question but will my heads fit onto the 257 until i can afford new ones? and ive also read that 257's have to get engineered. if this is the case does it cost much or is it just a headfck?

Hurtenstein · #30 28-03-2009, 08:25 PM

Quote:

Originally Posted by trainwrex

Fowling is not a good idea as it the bits around the bore that are not supported will fatigue. Sleeve or do nothing IMO.

Or both...