Hi there anybody done this over here??is it worth it??and how much would it cost??
I see in amarica a company called mps do them.

Just throughing some ideas about inmy head.

Cheers

 

Hi there

Speak with Drew over here,he running de-strokered 2.5L with CDB insert and he running in excess 600bhp

And about the best options I would speak with Alyn@AS Performance as he have probably best experience with CDB inserts and too I would speak with Drew

Jura

 

Have a look on NASIOC they are always doing that kind of engine build destroking 2.5 down to 2.3 and so on.SJ.

 

from what stroke to what stroke ??

just rods or rods and crank for this ?

 

What's the benefit to doing this?

 

2.5 blocks a more readily available than EJ22's, and cheaper, Al.

Makes a 2.35L engine a little bit cheaper to build.

 

Yeah I think you use the 2.0 crank with +2mm rods. Not 100% on this though but I know someone running around 650bhp in one with the block pinned.

 

I don't understand the benefit of these tbh... Are they supposed to rev better than a 2.5 or something by having the slightly shorter crank (75 vs 79mm)?

 

Many said,mainly US guys car with 2.0L crank rev faster than with 2.5L,not sure why,but people prefer there to run 2.0L cranks

You can check few threads over Nasioc where is thread about the longer rods vs normal size rods

As above for de-stroker you will need to run +2mm Longer rods,EJ207 cranks and off course pistons

Jura

 

Maybe I've read it wrong but I thought the 2.5 block required pinning to go 500+ or whatever?. And I thought pinning was quite expensive.

What is the expensive part of going 2.35 with an Ej22?.

 

Yeah pinning is the way to go for the 2.5 for added strength.The expense of going 2.35 is "everything" from the CDB block which are getting quite rare to find now where as the 2.5 can be found much easier and cheaper,plus all the machine work that's needed on the.2.35 rear thrust conversion 14mm head studs etc etc....,if you are building a 2.35 your building for BIG horse power,strength and reliability and to do it properly "COST"not to say a 2.1 doesn't,but the 2.35 cost much more.Before I was going to start my project me and Neil spoke hours about which direction I should take wether I do a 2.1 stroker or a built 2.0 or a 2.35 the 2.5 was never mentioned.SJ.

 

I've seen EJ22 blocks on here for around a grand. I understand EJ25 block's go for far less but once you factor in pinning then surely it's not that different?
EJ25 crank goes in both, what bore piston's are used in a 2.35?.
Machine work for rear thrust conversion was about £150 iirc for my CDB, is it a different process for EJ22's?.
I'm not knocking it, I'm genuinely interested.

 

Don't need to convert for rear thrust, on a 2.5L.

 

CDB insert is the way forward rather than pinning IMO as its far less "intrusive"......

plenty of EJ25/EJ257 blocks running 550-650 now with this method and far cheaper than most think........for a (very) fast road car the torque is unbeatable for me

 

Sounds good Alyn. Can you see any advantages of this de-strokered 2.5 block over a forged 2.5 or 2.35?.

 

I think you're looking at it the wrong way, Al. You de-stroke the 2.5 to make a 2.3, same as you'd use a stroker kit with an EJ22 to make a 2.3, Al.

 

I get that, but from what I'm reading that's down to cost. Making a 2.3 without using the £1k EJ22 block. The part I'm struggling with, is whether there's much difference in cost of the EJ22 block, and pinning/inserting a 2.5 block. There's not massive differences in price of crank's, and it must be simpler to buy standard rods than +2mm. Unless the piston bores are rare on the EJ22?.

Again, not criticizing, just out of general interest.

 

As above best way to go is CDB insert,this insert is proven on numerous cars

What is most expensive on 2.35L?

Do you want build 2.35L with cheap parts like Eagle rods or Manley H-Beam rods,I wouldn't

If you are going with 2.35L do you will be running better cams/valves and springs,retainers,I would

Would you consider to run on 2.35L 11mm headstuds,I wouldn't and due this almost everyone using 14mm headstuds,which not cheap plus machining for heads and block add cost

Rods are used standard length,pistons are specific for 2.35,crank is used EJ25

Plus block is not very common over here and usually you can get them cheaper from US

Jura

Not really,as above for de-strokered engine I wouldn't go with pinning and I would consider CDB insert

In de-strokered 2.35L crank is EJ207,for stroker from EJ22T 2.35 crank is used EJ257

Machine work is quite similar on both,just EJ25 don't needs to be converted to rear thrust

Jura

Sometimes is very hard to get nice and clean EJ22T and if the they cost.

About the price on the CDB insert and other bits,this should answer someone else as I don't know prices for this

+2mm longer rods are available and many companies selling them and they're not so difficult to get



Jura

 

Ah so the destrokered 2.5 isn't going to be running as much power as a 2.35 so doesn't require the same expensive parts inside.

 

Not really there,really depends on what power you are want to run and from this I would choose the parts

Destroker'd 2.35L can run same bhp as normal 2.35L,just difference is destroker'd 2.35L will be cheaper

Jura

 

So would i be right in thinking the big difference is the cost of the doner lump, i.e. the EJ25 is cheaper than the EJ22?

 

Depends on what is yours plan and what is power target,but yes destroker'd 2.35L can be cheaper when you will be using same parts as on 2.35L

Jura

 

So for the same/similar output, the de-stroked EJ25 would be a cheaper build?

 

I'm confused lol

 

Doesn't take much.

An EJ22 is usually around 12-1400 quid.

Probably get bare 2.5L block halves for around £200 or so. You'd still use the same quality internals as if you were building with an EJ22, just the block will be cheaper, even when you've added the CDB inserts.

There's no really cheap way of doing a 2.35, as you still need the turbo etc to justify it.

 

I know, lol.
Any idea what sort of region inserts cost?
Also do you not also end up with a lower compression ratio, or does it use thinner head gaskets

 

Taken from another thread

I was very surprised tbh was expecting more than that for sure Alyn is a very helpful man fair play to him, took time out to have a chat from his busy schedule, credit where it's due

 

I think I had read somewhere when someone had theirs pinned and had a higher figure in my head, so naturally assumed it would be similar.