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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 10-10-2005, 10:25 PM   #1
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Bad bearings = new engine block

Well, for those of you at SOC '05, you know that I spun some bearings at the convention which set me back a bit, but in the end gave me a chance to rebuild some things and change the design. Here are some pics of the bad bearings, but first a nice pic of the car:













Also, here are some pics of the car with the new engine installed. I took the time to make things shinnier than ever.





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Old 10-10-2005, 10:26 PM   #2
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So did you do anything major on the cyliners? pistons or bearings?
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Old 10-10-2005, 10:26 PM   #3
 
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good god, that's beautiful....
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Old 10-10-2005, 10:28 PM   #4
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sucks about the bearings....but I guess any excuse to upgrade is a good one

That car is truley amazing, I love seeing that engine bay it is so cleanly done.

It is truely a beauty and a beast!
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Old 10-10-2005, 10:31 PM   #5
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That. Is. Sick.

I mean, really.


Oh yeah, too bad about the bearings.


Wow.
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Old 10-10-2005, 10:35 PM   #6
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Time to take that Saab to the tracks and start laying some rubber and making some numbers
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for your repair needs
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Old 10-10-2005, 10:46 PM   #7
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The bottom end was purposefully kept stock as a sort of proof of theory. People are always saying that they have problems with the bottom end of the stock engine, but I would like to prove that if you manage detonation, you can take it to about 500 hp. I will post the dyno sheets soon.
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Old 10-10-2005, 10:48 PM   #8
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Sweet.

Nice goal.

Now I have pics to show the wife.


"Please honey?"

"Stainless hoses for x-mas?"
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Old 10-10-2005, 11:04 PM   #9
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Hey Kevin,

I was wondering about this, the car sounded pretty bad on the trailer. Glad you are getting this sorted out. Have you ever thought about going with a stand alone engine management system in your car. Is it getting tiresome having to keep waiting to get your ECU tuned again and again?
Cant wait to see thoes dyno numbers when you get them, nice work. Makes me want to get my bay that clean every time i look at your car.
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Old 10-24-2005, 12:58 PM   #10
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Any dyno sheets? Love to know what a beauty like that turns out!
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Old 10-24-2005, 03:38 PM   #11
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How do you end up with "bad bearings"? Would it be from not enough oil changes, bad oil, not enough oil.... anything oil related? How did it come to this?
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Old 10-24-2005, 04:02 PM   #12
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the engine was brand new hand built by yankmaster himself.
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238.8 whp 272.1 wtq
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Old 10-26-2005, 04:17 PM   #13
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Yeah bearings don't usually spin for no reason,there must not have been enough oil going there or the bearing clearance was too tight,Did you find out why it spun?
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Old 10-26-2005, 06:29 PM   #14
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There was an internal oil leak in the rear balance shaft bearing that had been pressed to block the oil passage. In the new block, I just left the balance shafts in place and pulled the chain. Now, I have around 25psi at idle and range up to 75 psi.
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Old 10-26-2005, 08:39 PM   #15
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Quote:
Originally Posted by KevinY
There was an internal oil leak in the rear balance shaft bearing that had been pressed to block the oil passage. In the new block, I just left the balance shafts in place and pulled the chain. Now, I have around 25psi at idle and range up to 75 psi.
Kevin, I have removed the balance shaft chain in the motor that I have been building for my 1991 9000, I did not take the shafts out for reasons of oil pressure, however I was not totally sure how to deal with the tensioner. What I did was make a blanking plate out of copper and just bolted it behind the tensioner housing. Is this along the line of what you have done? I am just looking for reassurance, I don't want to have oil pressure issues resulting in needing to prep a new block to rebuild.
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Old 10-27-2005, 04:56 PM   #16
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A cover plate is a good way. I just tapped the tensioner hole and put an 11mm bolt in there. Done!!
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Old 10-28-2005, 01:30 AM   #17
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Awww ... a whole thread about a spun bearing and no pictures of the bearing that spun?

How close were your measurements of bearing-journal clearance to the spec Saab actually calls for anyway and which bearings did you use? Just the Saab factory set?

Car looks pimp now with that shiney new engine. Get it to a dyno and show all the rest of us how to get things done!

-Adrian
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Old 10-29-2005, 02:53 PM   #18
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Looks to me like he posted pictures of the spun bearing...see the 3rd and 4th picture on his original post. It shows where the bearing gouged the block on the 3rd photo, and shows the bearing (still on the crankshaft) in the 4th photo.
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Old 10-29-2005, 09:27 PM   #19
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Quote:
Originally Posted by JK9000s
Looks to me like he posted pictures of the spun bearing...see the 3rd and 4th picture on his original post. It shows where the bearing gouged the block on the 3rd photo, and shows the bearing (still on the crankshaft) in the 4th photo.
Ahhh. You're right. In the fourth photo I mistook the bearing for the journal because of the color. But in the fifth photo you can see the seperation of the two bearing halves.

Pretty embarrassing to make that mistake as I have a C900 crankshaft sitting right next to me.
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