Hi guys,
Just a quick question, me & a mate are discussing which block we would use to build a stroked engine. Would you guys use a 2.0 cdb or a 2.2 open deck?
Id have said the 2.0 cdb stroked to 2.1 woukd be stronger, but the 2.2 stroked to 2.35 would have better torque.
Would the strength of a cdb really be a benefit if not chasing huge numbers?
This is hypothetical really, forgetting gearboxs etc which of those options would make for the best engine up to 500bhp??
Interested to hear everyones views on this.
Cheers.
James

 

2.2 open deck engine? What car is that from ?

How would you stroke a 2.2 to 2.1 ?

CDB has no advantage over ODB at low hp numbers, the weak point of subaru engines at mild tune are the bearings and pistons, not cylinder walls.

 

Edited the 2.2 stroked to 2.1!! Lol, should obviously have said 2.0, good spot
Ive seen a 2.2 block on ebay that is listed as impreza, although I assume its a legacy engine? Appears to be open deck though.
Thats what I always thought regarding the cdb, I assumed it wouldn't be an issue until you get to very high bhp figures..

 

I think i vaguely remember hearing about 2.2 open deck blocks, iirc it's from one of N/A models and would not be an acceptable block for a turbocharged model.

 

I see
Well that answers that then, the 2.0 cdb would be the best option there..
I thought the 22 was a legacy one, didnt realise it was only na though

 

Simple, get the 2.2 odb pinned or converted to closed deck.

 

Depends on your budget and your aim BHP.

Ej20 open deck is ok for 400-450bhp(horsepower at the crank, not wheels) if you like a revvy motor for back-roads driving
ej25 is best for city driving and circa 400-450bhp as well but with alot more torque.

Above that you are looking at a closed deck ej20 that can make close to 500bhp on a
MD321T billet. If you want more torque get a 2.1 stroker for your ej20 or buy a ej22 block and build a 2.2t

If you have alot of money then go for 2.2 stroked to 2.35 which can handle anywhere from 500 to 800bhp.

 

Another option is getting a CDB insert into a SCD 2.5 as you wont need to have machine work for rear/centre thrust bearing, Where you will need to on the others if you are using a nitrated crank.

 

Hi there

We are run 2.1L OBD at 490bhp/480lb-ft,some people running above 500bhp(I know few guys who running 550bhp without the issue ) without the problems,2.0L OBD have thicker liners than 2.5L

Yes if its budget then CDB insert is good option,not sure how much now cost,speak to Alyn@AS Performance about the prices

Jura

 

Not sure whether this is hearsay, but I'm still under the impression that 2.35's are more prone to HG failure than a 2 or 2.1.

Just something else to consider.

 

Does anyone know of any 2.0L failures with the 'wills rings' fitted?

 

2ltrs don't tend to need that kind of gasket sealing method with current multilayer gaskets available.

 

I was just curious that's all Shaun

 

A 2.1 ODB at 490? Nice work, they're obviously pretty strong if built right then! I'll probably end up going for a 2.1 myself, although I may be tempted to get a 2.0 CDB as I'll need a block anyway so might as well go for that.
Cheers for posting everyone, answered a few questions!

 

Yes 490bhp/480lb-ft we are made and engine has been awesome.We are done around 3 track days and numerous drag runs without the issue

Here is RR graph





2.1L is worth extra over 2.0L,really extra 100cc is worth,you will gain like on spool and on the torque plus sometimes on the power too

When OBD is build correctly and right parts will last and will be reliable

Jura

Jura

 

all depends on your power wishes??

CDB insert works well........

 

Cool, looks like a 2.1 could be the way to go! Jura, I wasn't doubting your power, sorry if that's how my post came across.

 

True but a little known fact about the 2.5 blocks is the 2010 onwards had much thinker liners. The down side to this of course is less cooling area around the liners..

 

Not sure on that there

Those newer 2010 blocks can have thicker liners/walls,but availability of them,not sure(plus price will be too different from EJ205/207),when EJ205/207 can be found easily and pick up for less,why spend more if clearly EJ205 OBD will make easily desired power

Jura

 

True ,I think you would be very lucky to find a second hand 2010 on block and would probably have to order a new short motor from subaru which i believe is 5k. not suggesting this is the way forward as there are probably better more affordable options. I was just pointing out the later 2.5 blocks had a lot thicker liners. It came about because some Americans took subaru to court over advertising their cars as Rally cars but the blocks couldn't take the tuning. Something to do with falsely advertising the cars i believe. Bob Rawles car is a 2010 block but cryo treated with CDB inserts. Damn that's a quick car that pulls from nothing. running 552/ 600+ on v-power i believe . Proves it can be made strong if the right parts are used but there is a huge cost.

Gone off topic, sorry lol.