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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 03-30-2008, 10:12 AM   #1
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boring out a b204

im planing on geting my block line bored the head decked and the cylinders bored before i start puting my 2.0l back together does anyone know how far they can be bored out before i get into the coolant pasages?
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Old 03-30-2008, 10:16 AM   #2
 
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No more than a mm over (.040 in) for safety, according to Saab, but some have pushed it more...

Why are you boring it out? Is the cylinder bore gouged?
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Old 03-30-2008, 01:24 PM   #3
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i think you want it honed, not bored..
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Old 03-30-2008, 06:03 PM   #4
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the reason i want to get it bored is because it is gong to be a strictly racing engine and the larger the bore the more power (torque it will produce)
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Old 03-30-2008, 06:32 PM   #5
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You would be better off refreshing a B234 and getting a tune for it. There is your displacement.
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Old 03-30-2008, 08:32 PM   #6
 
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Quote:
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the reason i want to get it bored is because it is gong to be a strictly racing engine and the larger the bore the more power (torque it will produce)

Lots of high power Saabs in Europe use the higher revving 2.0 engine and concentrate on the top of the engine, improving the breathing and strengthening the valve springs....
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Old 03-30-2008, 08:41 PM   #7
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i was told that the b204 and the b234 are the same block the only difference was the crank on the b234 had a longer stroke i plan on using a b234 crank in it and bore it out and i do pla on going with a better top end with cams valves valve springs port and polish and all the good stuff
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Old 03-30-2008, 09:36 PM   #8
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B234 + GT30xx seems to have some very good response from the majority of the people on here. Spools relatively low, and makes some great power.

I would say you should be fine with that
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Old 03-31-2008, 04:39 AM   #9
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IIRC, daveship bored his engine a bit over not sure why but it cost him plenty to get the template done ( again IIRC)

I think the limit ( besides what you read hear) is the aftermarket pistons you can use. I have only seen 90.5 and 91 in Woesner pistons larger than the OEM. I am not sure about the JTs that Nick has access to.

But of course you can go custom rods and all and make anything work

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Old 03-31-2008, 10:00 AM   #10
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I agree with mike that you can more comfortably rev the 2.0L higher, but the b234 is an excellent engine as demonstrated in kaylans car. I think its silly to bore an engine out for 'racing' and just get rings made for an oversize bore. Seems like a bad way to do things to me. .040 isn't going to give you more power, either.
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Last edited by saabsbreakdown; 03-31-2008 at 02:07 PM.
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Old 03-31-2008, 11:32 AM   #11
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You can go up to 93mm but anything over 91mm requires a different head gasket.
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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 04-03-2008, 09:28 PM   #12
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thanks im going to go talk to the machine shop tomarow and see what they say and se if i can get a price on it. i will try to ceep you all posted on the build but im buissy as hell at work and have to many projects going on right now so i dont have allot of time to get on the computer anymore. (the story of my life)

Last edited by cruzer51; 04-03-2008 at 09:31 PM. Reason: forgot part
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Old 04-03-2008, 10:18 PM   #13
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There was a few years back on ebay a c900 motor with small block chevy pistons in it. Keep us updated.
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Old 04-04-2008, 06:18 AM   #14
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I'd like to get a spare 204 block and build it up. Bore it out to 2.3 rather than go with a stroked 2.3. This way you can keep the short stroke and gain the displacement. (Like Ed did with his 2.5 Viggen, only he went with the long stroke for the 2.5).


High revving 2.3L oh yeah.


But then again, I have to find a 204 block first, and then get the pistons etc. So we'll see what really happens by the time I get around to it.
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Old 04-04-2008, 06:23 AM   #15
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IF you gobig bore on a 2.0 it ends up 2.1L You are not going to gain much at all. Eds it larger not for displacement but to unshroud the valves and make it flow better. Not necessarily for the extra motor size. The 2.0 / 2.3 difference is from the stroke difference basically makes more torque with the extra leverage.
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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 04-04-2008, 06:30 AM   #16
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Quote:
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IF you gobig bore on a 2.0 it ends up 2.1L You are not going to gain much at all. Eds it larger not for displacement but to unshroud the valves and make it flow better. Not necessarily for the extra motor size. The 2.0 / 2.3 difference is from the stroke difference basically makes more torque with the extra leverage.
Hmm.. I must have been misinformed then.

I thought the 2.0 could be bored out to 2.3... At least I remember a conversation (I thought with you) about that at SOC.
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Old 04-04-2008, 06:39 AM   #17
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Bore Stroke Displacement
93x90 = 2.445
90x90 = 2.290
90x78 = 1.984
93x78 = 2.119
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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 04-04-2008, 07:12 AM   #18
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Hmm.. I must have been misinformed then.

I thought the 2.0 could be bored out to 2.3... At least I remember a conversation (I thought with you) about that at SOC.
You can make a 2.3 into a 2.5 by boring over

John
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Old 04-04-2008, 03:07 PM   #19
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Max displacement

How about this.........
A. use the shorter rods from a b234 with the newer pistons with higher pin placement from a b235.
B. Have the crank reground to increase the stroke to bring the pistons back to the top of the deck. overbore if you like.
someone do the math, what would the max displacement be?????????
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Old 04-04-2008, 03:58 PM   #20
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Quote:
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How about this.........
A. use the shorter rods from a b234 with the newer pistons with higher pin placement from a b235.
B. Have the crank reground to increase the stroke to bring the pistons back to the top of the deck. overbore if you like.
someone do the math, what would the max displacement be?????????
get the crank re ground to increase the stroke? yeah, okay. your talking a whole different crank buddy, which cant even spin in the crankcase of the 2.0 block.
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