ok guys i'm desprate for info and cant find what i need on the net. i cant seem to get my second scooby running right and have lost all interest so i'm gonna rebuild my other scobby engine that went bang.

would i be best using my wrx block and rebuild it with forged internals or would a cdb be better with forged internals?

i'm led to beleive that sti engines were forged internals but was it cdb they used?


basically what do you guys recomend for strengh as i dont want it going bang again. i'm not really looking to make any extra bhp but would be a bonus lol.

maybe you have a cdb in ur garage or sti engine? let me know if you can help out as i'm stuck lol

 

cdb with forge internals is best

 

cheers mate was there any sti engines that came with the cdb and forged internals from the factory or will i need to custom build one?

 

can someone plz tell me why a cdb is better than a non cdb? what are the diffrences as i'm thinking if its even worth me looking for a cdb and to just rebuild my wrx block

 

ok something else i would like to know is as far as i know putting forged internals into a block will only make it stronger and cope with higher power but will not add bhp alone. but what about the heads? is it worth getting work done on these while they are off? my engine had bottom end failure so dont think i'd need to touch the heads but like i said is it worth getting them ported and polished?

 

if you want the most power avialible , port the heads as well , also forge internals will make you more power , i think the sti version 4 and the 22B come with cdb
If you are going 500 +bhp , a cdb is best

 

ok guys i have called subaru and i can get a complete new sti block for £800 + vat, (to fit a classic)

what sort of power can i get out of this block and would i be better just buying one of these instead of stripping mine and rebuilding it blah blah blah.

what is the difference between wrx and sti heads as my old engine is a wrx so thats the heads i'd be fitting to the sti block?

any advice would be great guys

 

if you only going to run it around 300-380bhp , the sti block will be "ok"

400+ get a forge engine

 

but i thought the sti block was fitted with forge internals?

 

theres forge and theres forge

sti engine will take up to 400 though

 

so i'd be best forging and rebuilding my wrx block lol? dont think i can find a closed deck block cheap enough

how much power could i get out a open deck block with forged internals then?

 

STi engine for a Classic has Subaru Forged HF Pistons,standard rods and crank.

 

so would you recomend that i buy a sti block or spend the money on forging my wrx block?

 

ive got a CDB for sale if your interested

 

a standard STI crank is very good RCM use these in builds well over 500 hp unless there is an unlimmited budget,
an open deck block is fine unless you are looking for well over 450 hp
all the 2.5s are open deck or (semi closed deck) which is a joke if youv seen one.
sti's heve forged pistons and all the rods are the same although iv heard it said the sti's rods are more even weight through hand selection when being built,
A closed deck block wont build horse power neither will it hurt,
it IS stronger no doubt thats why RCM will sell a complete 2.5 short block for under two grand but a CDB bare is over £1100
you have to be carefull you keep saying block and you will get a block sorry if i missunderstand but it seems your looking for a short block which is block crank pistons all assembled
Can you realy get a brand new short block from subaru for £800??
seems funny that thats about what a bare 2.5 block costs from Zen brand new from subaru which is nothing special just exactly that a new bare block
so if its a short block it is a good deal if its a bare block its exactly what you have already when you dissasemble yours

 

I would imagine the £800 Subaru one is one of their Reconditioned short motors done here in the UK.

 

its £800 for a short block so i'm guessing it will be a recon unit. i just dont know what line to go down

 

ur pm's are full mate, email details to adzer7886@aol.com asap

 

All i can say is if i was you and wanted strong reliable for as little cash as possible id strip your motor use your crank with my block rods and pistons put in new main and rod bearing and new rings easy deal with low 300s
probably a lot more but there are others who are better qualified to say just how much it will take put together properly with a NEW oil pump it should last a very long time unless thrashed from cold and generaly abused

 

The classic wrx type ra has a cdb too

 

my car is a ra wrx and isn't a cdb

 

It may of had another engine or bottom end at some point then fella i have a 93 ra with closed deck block if you click on "my scooby" theres a bit of info on what the Type ra came with etc, hope this is of help

 

my engine must of been changed

are the ra gearboxes rare to find? mine is fcuked i think.

how much would a box refurb cost?

 

wel iv'e just had a cdb off api impreza with uprated fuel and oil pump.sti crank and forged internals and steel rods for £2300 delivered.just in the process of bedding her in

 

So that was the built unit ready to drop in and add the ancillaries to and your away ???

I just missed a gear and turned my engine into a music box and am at current looking at my options.

It's a 96 RA CDB so i'm thinking a re-build with forged internals, just curious as to how much it will cost me if i whiop the engine out and take it to get re-built.

I don't feel brave enough to build it up myself yet ?????