Exhaust Cam Difference Between B204 and B234? - The Saab Link Forums

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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 02-25-2008, 02:24 PM   #1
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Exhaust Cam Difference Between B204 and B234?

When I swapped in the 9000 2.3t into my NG900 a few months ago I reused my 2.0 cylinder head. My Saab has been running great, but I recently discovered a hairline crack in my 2.0 cylinder head that would leak coolant into cylinder 4 when cold. So over the weekend I swapped in my spare B234 head, fully assembled. My Saab is still running well, but it now feels down in power at low rpms and spool-up feels slower. Idle has been good at 1000 rpms and power is smooth. I read on this site before that there was a difference between the B202 and B234 exhaust cams and I want to confirm this and find out what the difference is.

On a related story I re-installed my balance shaft chains during the cylinder head swap. I just couldn’t stand the high frequency buzzy with them out. It wasn’t too bad, but it made my Saab feel 10 years older than it is. I would not recommend the balance shaft delete for a daily driver.
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Old 02-25-2008, 02:28 PM   #2
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Quote:
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I just couldn’t stand the high frequency buzzy with them out. It wasn’t too bad, but it made my Saab feel 10 years older than it is. I would not recommend the balance shaft delete for a daily driver.


Truth. It's even worse with poly mounts and whatnot.


I can't help you with the cams, I just agree with you.
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Old 02-25-2008, 02:31 PM   #3
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I think they are the same. The only difference in cams I believe is on the b234i, not the turbo model. eric, I thought you had a p/p head on the 2.0L? That could be the reason for the slower spool and whatnot.
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Old 02-25-2008, 02:35 PM   #4
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Originally Posted by ERP View Post
When I swapped in the 9000 2.3t into my NG900 a few months ago I reused my 2.0 cylinder head. My Saab has been running great, but I recently discovered a hairline crack in my 2.0 cylinder head that would leak coolant into cylinder 4 when cold. So over the weekend I swapped in my spare B234 head, fully assembled. My Saab is still running well, but it now feels down in power at low rpms and spool-up feels slower. Idle has been good at 1000 rpms and power is smooth. I read on this site before that there was a difference between the B202 and B234 exhaust cams and I want to confirm this and find out what the difference is.

On a related story I re-installed my balance shaft chains during the cylinder head swap. I just couldn’t stand the high frequency buzzy with them out. It wasn’t too bad, but it made my Saab feel 10 years older than it is. I would not recommend the balance shaft delete for a daily driver.
Hey Eric, I had my saab indy and Jak look up the part numbers for the both the t5 2.0 cams and the 2.3 t5 cams and they have the same part numbers. There are no other part numbers available.

So, unless its a model that came from Canada or over seas, there is no difference that I can find. I checked my 2.0 exhaust cam on my 2.0 motor and my cse, same part number. I called and asked Nick again, he stated that only some where different, but like I said, there is no other part number, not even for the aero, so as best I can tell, the cams are the same.

Sure you are not off a tooth? The car will still run, but not idle as nice and the power band is different.

Glad you found the issue though! Good Luck,

John
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Old 02-25-2008, 02:42 PM   #5
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Palmer – I have the passenger side poly mount and the 9000 top poly mount, so it transferred well.

Makeyousaab – That’s right I did rebuild my 2.0 head, but I would not expect to feel such a difference. The 2.0 valves seats were machined, but I would not call it a port and polish, I just smoothed the exhaust runners a bit.

JZW – Thanks John. Being off a tooth was my first thought too, but it looked good when I set the timing. And it drives and idles fine, just feels a bit slower. Still, this is a high possiblility.
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Old 02-25-2008, 04:07 PM   #6
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Same cams if speaking of 94-98/9

http://www.genuinesaab.com/temp/cams.htm
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 02-25-2008, 05:43 PM   #7
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Thanks Nick, must just be the combination of balance shafts and stock cylinder head that make my engine feel slower.
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1996 900 'Aero' 2.3t Sold -
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Old 02-25-2008, 08:15 PM   #8
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I wonder if the balance chain is making that much of an effect, I definetly thought my car felt much more peppy with it off, maybe like that brand new ic feels when you first put it on, or the dp.

I like to clean up the ports and flow things a little bit. With my new cams, my car is scary fast now, you will have to come take a ride sometime

Good Luck,

John
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