How to strenghten a 2.5 open deck block

[rb268]

have a 2.5 impreza looking to see if any one knows how to strengthen the block, as it is an open deck block. Does anyone have any contact for someone that can help me, with this promblem. thanks

[scooby222]

have a word with Glyn (Ballistic) as i know he's looked at this extensively - you having problems or just planning strengthening for more upgrades? think that was you sitting behind me going into knockers last sunday - i had the sparkly rear stickers lol

[G.Mac]

Sell it and buy an ej22 cdb use your crank and have s 2.35

[rb268]

have a word with Glyn (Ballistic) as i know he's looked at this extensively - you having problems or just planning strengthening for more upgrades? think that was you sitting behind me going into knockers last sunday - i had the sparkly rear stickers lol

looking to upgrade from standard any idea m8

[rb268]

Sell it and buy an ej22 cdb use your crank and have s 2.35

sorry m8 happy with the ej2.5 engine just need it strengthen any ideas thanks

[patsy]

Can you not get them pinned? I know people get the ej257 semi-closed decks pinned for extra strength. Not sure of the outs and ins personally, but I've read it somewhere.

Ryan

[rb268]

Can you not get them pinned? I know people get the ej257 semi-closed decks pinned for extra strength. Not sure of the outs and ins personally, but I've read it somewhere.

Ryan

me to but where m8

[patsy]

me to but where m8

I'm sure that a guy over on 22b was recently in Jap Performance or a similar mag. Sure he's running a ej257 that's been pinned and running around 600bhp. Should be plenty reading on 22b maybe.

Ryan

[ciaranrb5]

I'm sure that a guy over on 22b was recently in Jap Performance or a similar mag. Sure he's running a ej257 that's been pinned and running around 600bhp. Should be plenty reading on 22b maybe.

Ryan

Daz's car that was featured in JP has relinered CDB with capacity increased to 2.5.

Peter Fai 17 on here had his 2.5 pinned though may be worth asking him.

I also know zen performance ran a pinned 2.5 as well so you could always e-mail Paul.

Other option is im sure Steve at SW motorsport in Edinburgh could sort it for you.

[rb268]

Daz's car that was featured in JP has relinered CDB with capacity increased to 2.5.

Peter Fai 17 on here had his 2.5 pinned though may be worth asking him.

I also know zen performance ran a pinned 2.5 as well so you could always e-mail Paul.

Other option is im sure Steve at SW motorsport in Edinburgh could sort it for you.

thanks m8

[arch]

They were all semi closed deck blocks to start with not open deck blocks.

[rb268]

They were all semi closed deck blocks to start with not open deck blocks.

i no m8 thanks

that what mines is m8 sorry

[patsy]

i no m8 thanks

that what mines is m8 sorry

So your block is a semi-closed ej257? Thought it would have been. Same as the one I put in ma wagon?

[rb268]

So your block is a semi-closed ej257? Thought it would have been. Same as the one I put in ma wagon?

yes m8

[wilky]

The problem with sleeving the bore, or "pinning" (Some call it wedging) a semi closed deck block, or even a closed deck block, is the fact that over a certain amount of boost/power the block will actually stretch.

What I mean by that is that once you are pushing the envelope way beyond what the EJ engine was ever designed to handle but uprating the rods, pistons bearings etc etc you are still left with the same block design/material.

Above a certain tolerance the block will elongate a bawhair, maybe only a thou, but its enough to drop the liner or the wedge and give sealing issues which under WOT will induce det and the rest we all know.

Some combat this by making the sleeves sit a thou or so proud of the block to compensate and give a good seal even if the block stretches.

Prodrive used obturation (or Wills) rings which eliminated the gasket, and used very long bolts on all four corners which went all the way through the block to the other side to torque the whole lot together, and it worked pretty good for them. (sometimes they were running 2.7bar)

At our level on a sleeved block for reliabilty unless you are trying to win Time attack, I would not run a car with sleeved bores or anything pinned for strength over 2 bar (1.95 to be safe)

On a semi closed deck block like the one you say you have, even with uprated internals I would not want to be running more than 1.7 bar max. Others may say thats being gay, but thats as far I would be happy with.

What you intend to do should dictate whether you need to strengthen the block or not. If you do, SW Motorsport can give you all the guidance you need.

Which takes you back to why GMac says get a CDB.

[rb268]

The problem with sleeving the bore, or "pinning" (Some call it wedging) a semi closed deck block, or even a closed deck block, is the fact that over a certain amount of boost/power the block will actually stretch.

What I mean by that is that once you are pushing the envelope way beyond what the EJ engine was ever designed to handle but uprating the rods, pistons bearings etc etc you are still left with the same block design/material.

Above a certain tolerance the block will elongate a bawhair, maybe only a thou, but its enough to drop the liner or the wedge and give sealing issues which under WOT will induce det and the rest we all know.

Some combat this by making the sleeves sit a thou or so proud of the block to compensate and give a good seal even if the block stretches.

Prodrive used obturation (or Wills) rings which eliminated the gasket, and used very long bolts on all four corners which went all the way through the block to the other side to torque the whole lot together, and it worked pretty good for them. (sometimes they were running 2.7bar)

At our level on a sleeved block for reliabilty unless you are trying to win Time attack, I would not run a car with sleeved bores or anything pinned for strength over 2 bar (1.95 to be safe)

On a semi closed deck block like the one you say you have, even with uprated internals I would not want to be running more than 1.7 bar max. Others may say thats being gay, but thats as far I would be happy with.

What you intend to do should dictate whether you need to strengthen the block or not. If you do, SW Motorsport can give you all the guidance you need.

Which takes you back to why GMac says get a CDB.

steve built my car the car runs 1.8 bar i am positive the bores are moving so just looking to strengthen up the block

Edited May 22, 2011 by rb268

[patsy]

Wee bit of topic man, but what clutch is in your motor? Pm me if you prefer.

Ryan

[scooby222]

as i said speak to Glyn on here, he has a 2.5 being pinned at the moment and knows far more on 2.5's than me - thats why ive stuck with a 2.0 sti to avoid any problems

know your cars far from standard but obviously theres a difference between strenghtening a healthy engine and repairing a damaged one - i believe agra in dundee would carry out the work your looking for, theyve built several engines for time attack. theres also api engines down south and roger clark motorsport

[rb268]

Wee bit of topic man, but what clutch is in your motor? Pm me if you prefer.

Ryan

exedy cera-metallic twin-plate clutch

[rb268]

as i said speak to Glyn on here, he has a 2.5 being pinned at the moment and knows far more on 2.5's than me - thats why ive stuck with a 2.0 sti to avoid any problems

know your cars far from standard but obviously theres a difference between strenghtening a healthy engine and repairing a damaged one - i believe agra in dundee would carry out the work your looking for, theyve built several engines for time attack. theres also api engines down south and roger clark motorsport

thanks m8

[scooby222]

nah Kevin, Glyn had to learn the hard way about strengthening 2.5's, i know he talked to a lot of tuning people before settling on a spec for his rebuild

[craigdmcd]

http://www.finchmotorsport.co.uk/page.php?a=3&s=69&p=69 .Have a look at the bottom of this link .This company are doing a closed deck EJ257 so to me looks like a machined insert in water gallery ie the way the block top looks or speak to Andy at Ra about the engine Agra built him for the race car he had

I saw this down at Litchfield Imports almost 2 years ago, although I believe he was also trying to work out how to get full blocks made as a closed deck rather than inserting or machining standard blocks. I believe the cost was very high though.

[arch]

Both Steve Whitson and Alyn at As performance can have the block pinned for you. There is however no definitive proof for or against this as far as I can find.

[wilky]

What makes you think you are getting movement?

My linered 2.35 is a 2.0 CDB relinered to 2.2 and a 2.5 crank.

Edited May 23, 2011 by Wilky

[rb268]

What makes you think you are getting movement?

My linered 2.35 is a 2.0 CDB relinered to 2.2 and a 2.5 crank.

4 or 5 session at knockhill & the water temputure start riseing sometime

omly on hight boost eg 1.8 bar think the cylinder are moving

you can run 1.6 bar all day basiclly polishing the head gaskets

the same as chris 2.5

& we are using cosworth 260 head studs

will take you for spin around the track the next time your over m8