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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 08-24-2008, 07:53 PM   #1
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crank balancing

does anyone have a machine shop near them that will balance a crank for my b234?? im looking for high rpms with this motor and all the machine shops in the area wont touch them... any help is appreciated...
thanks
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Old 08-25-2008, 09:23 AM   #2
 
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How high are you looking to go?
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Old 08-25-2008, 09:28 AM   #3
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AC Performance in Colchester does balancing work. They lightened and balanced my flywheel.

http://www.acperformancecenter.com/index.html

Andy is a really good guy, it wouldn't hurt to ask if they could do it.
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Old 08-25-2008, 10:31 AM   #4
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If you're looking for the motor to make high rpm, you will not only want to balance the crank shaft, but you'll want to get it knife-edged as well. Will not only reduce the weight of the CS, but it will also help wisk the oil from it more quickly. You may also want to add in a crankshaft scraper as well, again to wisk the oil away on high rpm applications.
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Old 08-25-2008, 02:05 PM   #5
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well i want to be able to run an aluminum flywheel( the one nick sells) and i was told that the saab cranks need to be balanced before using that light of a flywheel?? correct?? if it were possible i would like to see between 7500 and 8000 rpms...
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Old 08-25-2008, 02:17 PM   #6
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well i want to be able to run an aluminum flywheel( the one nick sells) and i was told that the saab cranks need to be balanced before using that light of a flywheel?? correct?? if it were possible i would like to see between 7500 and 8000 rpms...

you're not going to see power in the 7500-8000 range in the Saab B2xx motors without a lot of work: Port&Polish, bigger valves, high lift & duration cams, non-hydralic lifters, match ported intake runners, etc etc.
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Old 08-25-2008, 02:28 PM   #7
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well i want to be able to run an aluminum flywheel( the one nick sells) and i was told that the saab cranks need to be balanced before using that light of a flywheel?? correct?? if it were possible i would like to see between 7500 and 8000 rpms...
There are quite a few running that flywheel and I dont think any of them have done anything to their crankshaft.
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Old 08-25-2008, 02:37 PM   #8
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running a b234 in that area isnt gonna last very long
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Old 08-25-2008, 03:18 PM   #9
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this isnt going to be any ordinary b234 its getting a full rebuild with je internals and stock top end for now... then once everything is running correctly and my bank account increases im doing valves springs cams and a port/polish... so how safe is it to run a 7.5 lb flywheel without balancing the crank and running relatively stock rpms???
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Old 08-25-2008, 03:18 PM   #10
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shouldnt have an issue
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Old 08-25-2008, 03:23 PM   #11
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I agree, should be an issue....just make sure the new flywheel is balanced. Its best to have it balanced in conjection with the clutch disk and pressure plate that you will be using
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Old 08-25-2008, 03:27 PM   #12
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alright i guess if i cant find a place this week than the flywheel is going on and the crank is going to stay stock...
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Old 08-25-2008, 06:46 PM   #13
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if your having a crank balanced, you must send the flywheel, clutch, and crank pulley, that is the only true way to harmonically balance it.



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Old 08-25-2008, 07:11 PM   #14
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if your having a crank balanced, you must send the flywheel, clutch, and crank pulley, that is the only true way to harmonically balance it.
True!

To make those sort of RPM's 7500-8000 its necessary to go to dry sump aswell as these engines can have oiling probs aswell at high rpm. Maybe add in an oil resrictor for the solid lifters to keep vital oil for crank and polish/smooth the oil galleries for improved flow
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Old 08-27-2008, 06:13 AM   #15
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I love the lt weight flywheel with the B234, revs much more like the B204 did.

Didn't do anything else to any other parts.






That comes this winter...
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Old 08-27-2008, 07:04 AM   #16
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id say its worth doing, with billet flywheel and lightened and balanced crank the car revs so much more freely. it would be even better with lighter forged pistons aswell.
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Old 08-27-2008, 08:47 AM   #17
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Quote:
Originally Posted by saab4life93t View Post
well i want to be able to run an aluminum flywheel( the one nick sells) and i was told that the saab cranks need to be balanced before using that light of a flywheel?? correct?? if it were possible i would like to see between 7500 and 8000 rpms...
As its been pointed out you don't need to balance the crank to run the Spec flywheel. Been in my car since Nick had them available and have had no issues.

However as also said to balance your crank your going to have to send it in with anything that bolts to is so the pulley, flywheel, clutch/pp combo.



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