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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 09-29-2015, 04:30 AM   #1
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Block rebuild stock pistons or wossner

Hey everyone im getting ready to bring a block crank and rods to a local machine shop whos going to do somr work for me. I run a 19t td04 stg 5 e85 setup on a b204l. My ring have bad blow by and its time to rebuild.

The car will probably never go and higher on power levels. My main concern is will the piston be fine and last along time like a normal power engine. I know alot of ppl make alot of power on the stock motor. I just want it to last atleast 100k of hard driving.

So im really curious if people think it's better to get wossners or if the stock ones will hold for along time at 350-390 bhp
Thank you Connor
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Old 09-29-2015, 06:41 AM   #2
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I would go forged at that power level.
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Old 09-29-2015, 09:14 AM   #3
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if you're going to go through all the trouble of rebuilding the engine. just put in the wossners and you won't have to worry about it.
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Old 09-29-2015, 10:40 AM   #4
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wossner does not make pistons for the B204
only b234, b235, b205

JE makes pistons for the b204

Rumor has it that Wiseco started making pistons for our Saabs (cannot confirm)
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Old 09-30-2015, 05:06 AM   #5
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I didnt know that. Ive not heard bad things about JE but have heard the side skirt coat isnt worth the extra 150 and just have heard more about wossner.
A lil bit of a bummer, so my only choice is JE then pretty much?

Also if you have the cylinders bored over .5 or 1 mm is that like increasing the liter size? Like a 2.1t or 2.2t?
Thank you Connor
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Old 10-05-2015, 12:55 PM   #6
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bore=90mm (or 93???)
Radius=45mm
((pi*(45)^2*stroke,or 78mm)/1000000cubic ml/liter)*4cylinder=1.98liters
((pi*45.5^2*78 *4)/1000000cubic ml/liter)*4cyl=2.03liters--> this is w/1mm overbore
1.98/2.03
You've increased displacement by ~2.5%, which is negligible.
-Cm
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Old 10-06-2015, 06:43 AM   #7
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haha so you become a true 2 liter engine
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Old 10-06-2015, 07:53 AM   #8
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Didn't you say b204?
I thought 204s were perfectly fine with his power goals?
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Old 10-06-2015, 11:00 AM   #9
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They are. We just figured since he has the motor apart and told us he was going to be beating the shit out of it for 100k, he might as well.
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Old 10-07-2015, 03:44 PM   #10
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they are. We just figured since he has the motor apart and told us he was going to be beating the shit out of it for 100k, he might as well.
+1
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Old 10-12-2015, 10:39 PM   #11
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bore=90mm (or 93???)
Radius=45mm
((pi*(45)^2*stroke,or 78mm)/1000000cubic ml/liter)*4cylinder=1.98liters
((pi*45.5^2*78 *4)/1000000cubic ml/liter)*4cyl=2.03liters--> this is w/1mm overbore
1.98/2.03
You've increased displacement by ~2.5%, which is negligible.
-Cm
@200bhp/Liter, you get 12 more ponies with 1mm overbore. Whether or not you actually realize that, is dubious, but the pedagogical exercise is entertaining. I'd say 6 whore'spower @ the crank might be expected. Which, at the cost of machining and pistons ~$1600, this is undoubtedly the WORST $/hp ratio known--2nd only to BMW products.
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