Going 2.5 forged
03 July 2014 | 12:34 PM
#32
Scooby Regular
Joined: Nov 2013
Posts: 2,626
Likes: 0
From: I'll check my gps
what is CDB and do I want it?
03 July 2014 | 12:39 PM
#33
CDB = Closed deck block.
Some of the 2.0 litre blocks were closed deck and the 2.2 were as well.
Open deck block:
Closed deck block:
As you can see, the closed deck block is much stronger and capable of holding much more power.
the 2.5 block was never made in CDB but you can get liners to fit the holes to make it (kinda) into a CDB. Although it's not strictly a full CDB.
Hope this helps.
Some of the 2.0 litre blocks were closed deck and the 2.2 were as well.
Open deck block:
Closed deck block:
As you can see, the closed deck block is much stronger and capable of holding much more power.
the 2.5 block was never made in CDB but you can get liners to fit the holes to make it (kinda) into a CDB. Although it's not strictly a full CDB.
Hope this helps.
Last edited by BrownPantsRacing; 03 July 2014 at 12:42 PM.
03 July 2014 | 01:44 PM
#37
Scooby Regular
Joined: Nov 2013
Posts: 2,626
Likes: 0
From: I'll check my gps
CDB = Closed deck block.
Some of the 2.0 litre blocks were closed deck and the 2.2 were as well.
As you can see, the closed deck block is much stronger and capable of holding much more power.
the 2.5 block was never made in CDB but you can get liners to fit the holes to make it (kinda) into a CDB. Although it's not strictly a full CDB.
Hope this helps.
Some of the 2.0 litre blocks were closed deck and the 2.2 were as well.
As you can see, the closed deck block is much stronger and capable of holding much more power.
the 2.5 block was never made in CDB but you can get liners to fit the holes to make it (kinda) into a CDB. Although it's not strictly a full CDB.
Hope this helps.
But......I know have a new question, with a CDB is cooling more of an issue?
Last edited by Carnut; 03 July 2014 at 01:46 PM.
03 July 2014 | 01:56 PM
#40
03 July 2014 | 01:56 PM
#41
My spec with engine build
Mdxt turbo with dv delete
Fmic
Alcatek
3 bar sensor
Full 3"decat
Gt spec headers and hs up pipe
Fuel lab fpr
650s
Cdf fuel rails (rcm braided lines)
Induction kit with cold intake
255 fuel pump
3 port solinoid
Probably missed something
Mdxt turbo with dv delete
Fmic
Alcatek
3 bar sensor
Full 3"decat
Gt spec headers and hs up pipe
Fuel lab fpr
650s
Cdf fuel rails (rcm braided lines)
Induction kit with cold intake
255 fuel pump
3 port solinoid
Probably missed something
03 July 2014 | 01:58 PM
#43
Scooby Regular
Joined: Jan 2010
Posts: 450
Likes: 0
Reading with great interest...
So... Would it not be better to get a 2l block that's closed.. Then bore/stroke to 2.5?? And cheaper!!
Rather than get a 2.5 pinned.. I would have thought that the 2l block would be stronger??
Also I thought 2.5l STI blocks was semi closed??
So... Would it not be better to get a 2l block that's closed.. Then bore/stroke to 2.5?? And cheaper!!
Rather than get a 2.5 pinned.. I would have thought that the 2l block would be stronger??
Also I thought 2.5l STI blocks was semi closed??
03 July 2014 | 01:59 PM
#44
Reading with great interest...
So... Would it not be better to get a 2l block that's closed.. Then bore/stroke to 2.5?? And cheaper!!
Rather than get a 2.5 pinned.. I would have thought that the 2l block would be stronger??
Also I thought 2.5l STI blocks was semi closed??
So... Would it not be better to get a 2l block that's closed.. Then bore/stroke to 2.5?? And cheaper!!
Rather than get a 2.5 pinned.. I would have thought that the 2l block would be stronger??
Also I thought 2.5l STI blocks was semi closed??
03 July 2014 | 02:04 PM
#46
03 July 2014 | 02:54 PM
#47
Former Sponsor
Joined: Aug 2012
Posts: 571
Likes: 0
From: Holywell
I think the 650's will be getting close to their limits also, I'll get them flow checked and cleaned during the build, better safe than sorry!!
To answer some earlier questions, you can convert an open deck or semi closed 2.5 block to closed deck, it works out around £500 with AS Performance, you need to rebore it also, so if you have a +0.5mm block I wouldn't convert it, only use a std bore block.
To answer some earlier questions, you can convert an open deck or semi closed 2.5 block to closed deck, it works out around £500 with AS Performance, you need to rebore it also, so if you have a +0.5mm block I wouldn't convert it, only use a std bore block.
03 July 2014 | 03:00 PM
#48
I think the 650's will be getting close to their limits also, I'll get them flow checked and cleaned during the build, better safe than sorry!!
To answer some earlier questions, you can convert an open deck or semi closed 2.5 block to closed deck, it works out around £500 with AS Performance, you need to rebore it also, so if you have a +0.5mm block I wouldn't convert it, only use a std bore block.
To answer some earlier questions, you can convert an open deck or semi closed 2.5 block to closed deck, it works out around £500 with AS Performance, you need to rebore it also, so if you have a +0.5mm block I wouldn't convert it, only use a std bore block.
03 July 2014 | 06:35 PM
#49
I'd tend to agree. Think 800's would be better, and the RCM fuel pump.
When I went 2.5 forged, I also had supertech valves and springs fitted. You may want to consider them too..
Hope it goes well for you..
When I went 2.5 forged, I also had supertech valves and springs fitted. You may want to consider them too..
Hope it goes well for you..
03 July 2014 | 06:40 PM
#50
03 July 2014 | 07:50 PM
#52
03 July 2014 | 08:09 PM
#53
04 July 2014 | 10:20 AM
#59
Looking good this your proposed spec is similar to what I have built, and all suggestions for alterations are all of what I built mine using ie injectors, fuel pump etc, even so I still find it interesting, also reassuring that my choices are common options