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PostPosted: Mon Jul 02, 2018 9:13 pm 
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Location: Peterborough
Car Model: SAAB 9-3 SE
Many moons ago I decided I was going to build a kit car.... it's been a slow project....

Anyway I'm now finally progressing since finances are in a better place.

Currently it's fitted with a b204, which has a nice custom manifold and nice turbo along with 630s, volvo springs, balance delete, dry sumped etc etc.

Anyway having thought about it I figured I'd like to get the turbo going sooner in the revs... the obvious way to do this is a 2.3 conversion so this is where the questions begin...

1) will a b235 crank fit into my b204 block?
2) is a b235 block any lighter than the b204?
3) if the 235 is lighter, is it any less strong... would it be worth me switching to the 235 block to save some weight or potentially another failure point I don't need?
I'd plan to stick with my existing head as I have the custom inlet and exhaust manifolds made unless they can be used on a b235 head, not sure if the flanges are the same? Or if it's even a good idea given the weaker valves... I would be sticking to T5 management for simplicity.
If I go ahead with the conversion I'll be putting forged rods and pistons in, not that they are 100% needed for the power I'll run in the realms of a bit over 400hp but saving rotational mass etc.
Anyone able to answer these? My only saab experience is with b204 blocks.

Thanks


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PostPosted: Mon Jul 02, 2018 9:22 pm 
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Location: Reading, Saabshire
Car Model: Merc A200d AMG 7sp DCT
B2x5 Blocks are weaker in design to B2x4 blocks.

A few years back i had the two side by side upside down. And the B2x5 block has all the meaty webbing around the inner crank case and bearing journals all removed.
Also the wall thickness of the block is a few mm thinner.

So if your going 400bhp +, i would stick with an older B2x4 block.

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PostPosted: Mon Jul 02, 2018 9:32 pm 
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Thanks that's question 2 and 3 answered... any ideas about question 1?


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PostPosted: Mon Jul 02, 2018 11:24 pm 
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I'm a bit confused as to why you are trying to fit B235 parts to a B204 head when a B234 would be a direct replacement for the B204. And able to handle a lot more power in standard form than a B235.
If for some reason you preferred to keep your B204 block instead of the B234 block, all the B234 internals should fit in your B204. The blocks are identical (the same part number).

Go for a 1994-on B234 Turbo engine. 1991-1993 B234 Turbo was quite different (referred to as "long-block").

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PostPosted: Mon Jul 02, 2018 11:38 pm 
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I understand the query sounds odd... the reason for it is a b234 block isn't exactly easy to come by for sensible money these days. Don't really want to pay top money for one when the only thing I want out of it is the crank given I'll be changing the rods and pistons anyway.

Dan


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PostPosted: Tue Jul 03, 2018 7:39 am 
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Joined: Sun Mar 25, 2018 7:12 pm
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Location: Scarborough,North Yorkshire
Car Model: 1996 9000 Aero- Volvo XC90
I’m breaking a my96 aero Dan, where are you in the uk?


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PostPosted: Tue Jul 03, 2018 8:14 am 
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Location: The wee county Scotland
Car Model: Saab 9000 aero
234 internals are more than capable of handling the power you are aiming for and cheaper than forged internals.

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PostPosted: Tue Jul 03, 2018 12:37 pm 
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Location: Queenborough, Kent
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in terms of ballpark figures - what I've heard is that the B2x5 engines are good to 300BHP, the B2x4 engines are good for 500BHP. I seem to remember hearing that the B2x4 internals are forged already?

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PostPosted: Tue Jul 03, 2018 2:22 pm 
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Yes all B2x4 engines are forged.
Hence why they are so tough.

Just supply more fuel and air and your good to go !

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PostPosted: Tue Jul 03, 2018 2:29 pm 
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_Dan_ wrote:
I understand the query sounds odd... the reason for it is a b234 block isn't exactly easy to come by for sensible money these days. Don't really want to pay top money for one when the only thing I want out of it is the crank given I'll be changing the rods and pistons anyway.

Dan


So why don't you just look for a B234 crank?

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PostPosted: Tue Jul 03, 2018 6:09 pm 
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Bear in mind that all turbocharged B234's use the same internals - so you don't need an Aero engine, an ecopower one (170BHP) will do ...

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PostPosted: Sat Jul 07, 2018 12:44 am 
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Car Model: SAAB 9-3 SE
Jules_ht wrote:
_Dan_ wrote:
I understand the query sounds odd... the reason for it is a b234 block isn't exactly easy to come by for sensible money these days. Don't really want to pay top money for one when the only thing I want out of it is the crank given I'll be changing the rods and pistons anyway.

Dan


So why don't you just look for a B234 crank?

Seen one for sale anywhere?


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PostPosted: Sat Jul 07, 2018 9:51 am 
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Location: Maidstone
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A 234 crank is the same as a 235 crank.
Whole engine for £150 here :

http://www.uksaabs.co.uk/UKS/viewtopic.php?f=8&t=188233

I reckon this car will have a good crank :
http://www.uksaabs.co.uk/UKS/viewtopic.php?f=8&t=189595

B234 here:

http://www.uksaabs.co.uk/UKS/viewtopic.php?f=18&t=188781

And another:

http://www.uksaabs.co.uk/UKS/viewtopic.php?f=18&t=189257

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PostPosted: Sat Jul 07, 2018 10:38 am 
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Location: Peterborough
Car Model: SAAB 9-3 SE
Thanks Rich,
I suspected the cranks were the same... thanks for the links clearly I've not been looking in the right places for engines lol


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