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help with engine rebuild

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Old 03 August 2008, 20:01
adzer
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Default help with engine rebuild
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
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Old 03 August 2008, 20:23
bighead
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cdb with forge internals is best
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Old 03 August 2008, 20:29
adzer
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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?
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Old 03 August 2008, 21:10
adzer
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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
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Old 03 August 2008, 21:56
adzer
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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?
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Old 03 August 2008, 23:17
bighead
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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
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Old 04 August 2008, 15:16
adzer
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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
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Old 04 August 2008, 17:35
bighead
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if you only going to run it around 300-380bhp , the sti block will be "ok"

400+ get a forge engine
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Old 04 August 2008, 18:00
adzer
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but i thought the sti block was fitted with forge internals?
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Old 04 August 2008, 18:02
bighead
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theres forge and theres forge

sti engine will take up to 400 though
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Old 04 August 2008, 18:23
adzer
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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?
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Old 04 August 2008, 18:35
merlin24
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STi engine for a Classic has Subaru Forged HF Pistons,standard rods and crank.
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Old 04 August 2008, 18:39
adzer
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so would you recomend that i buy a sti block or spend the money on forging my wrx block?
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Old 04 August 2008, 19:34
old bob
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ive got a CDB for sale if your interested
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Old 04 August 2008, 19:56
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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

Badbird thinks you should all buy American car world magazine and see a real badbird in the centre pages
Last edited by Badbird : 04 August 2008 at 20:10.
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Old 04 August 2008, 20:15
merlin24
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I would imagine the £800 Subaru one is one of their Reconditioned short motors done here in the UK.
Last edited by merlin24 : 04 August 2008 at 20:16. Reason: spelling
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Old 04 August 2008, 20:44
adzer
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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
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Old 04 August 2008, 20:48
adzer
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Quote:
Originally Posted by old bob View Post
ive got a CDB for sale if your interested
ur pm's are full mate, email details to adzer7886@aol.com asap
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Old 04 August 2008, 21:02
Badbird
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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