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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 10-29-2007, 03:39 PM   #1
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B204 question

anyone know if the B204 2.0l turbo out of a 99 9-3 has a forged or a cast crank?
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Old 10-29-2007, 03:41 PM   #2
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Not sure, but the crank surely is not a weak spot at all. They're probably good for over 800hp, well, probably more than that.

Either way, more than the rest of the chassis can handle.
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Old 10-29-2007, 03:52 PM   #3
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thanks just wondering because i was planning on turning it about 7500, 8000 rpm and i dont think a cast will take that kind of abuse, and i dont want to get a billet one made because it is probibly expencive as hell.
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Old 10-29-2007, 04:11 PM   #4
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Yes, it will take that abuse, as long as it is well balanced.

It's the valvetrane you need to worry about. You will get pretty near to having valve float issues and and overworking the hydraulic lifters around 8000 from what I've heard.

There are people running over 7000 on all stock internals, probably risky with stock valvetrane, but still doable.
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Old 10-29-2007, 04:36 PM   #5
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Quote:
Originally Posted by JK View Post
Yes, it will take that abuse, as long as it is well balanced.

It's the valvetrane you need to worry about. You will get pretty near to having valve float issues and and overworking the hydraulic lifters around 8000 from what I've heard.

There are people running over 7000 on all stock internals, probably risky with stock valvetrane, but still doable.
from what i understand the valves have issues around 7000-7500 depending on the health of the lifters most likely. that is probably the main issue for an 8krpm redline, that, and the fact that the stock cams wont make any power up that high.

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Old 10-29-2007, 06:42 PM   #6
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thanks i will probibly have to go wit some type of a stiffer valve spring, im going to have the head built anyway so il do that all at the same time, i have another question on the B234 compaired the B204 does the B234 have a larger bore ize or is there a difference in the stroke?
sorry for all of the questions just trying to figure out what all im going to be needing to build my engine. thanks
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Old 10-29-2007, 06:54 PM   #7
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The only differences between a B204 and B234 are the pistons, rods, stroke, and the software loaded on the ECU. Everything else is the same practically.

The rods are fracture-split forge steel.



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Old 10-30-2007, 03:39 AM   #8
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Saabs have forged crankshafts.

The B234 is a stroked B204.
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Old 10-30-2007, 05:56 PM   #9
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thanks that was really helpfull another question anyone know what diamiter the rod jounal is on the B234 crank?
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Old 10-31-2007, 04:12 AM   #10
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I would answer that, but my WIS is on my laptop which is at home....perhaps during the day, someone with WIS access can chime in.
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