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Scat Kit Bearing and Balance Quality #57883
05/07/08 03:50 PM
05/07/08 03:50 PM
Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S Offline OP
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69Cuda340S  Offline OP
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MARYLAND
I am planning to buy a Scat Rotating assembly and my machine shop insists the balance should be gone over even though Scat guarantees their balanced kits are balanced. I am also have all the bearing clearances gone over but everyone seems to recommend that. What do you guys think?

Re: Scat Kit Bearing and Balance Quality [Re: 69Cuda340S] #57884
05/07/08 08:44 PM
05/07/08 08:44 PM
Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices Offline
Why would you even post that?
HealthServices  Offline
Why would you even post that?

Joined: Dec 2007
Posts: 7,759
So Cal
It is always a good idea to have someone check any machining or balancing work. You have saved a bunch of money already by going to this kit, may as well use some of the saved money to check the work that was done.


Allen Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first. Life was a little easier when I was just a wrench.
Re: Scat Kit Bearing and Balance Quality [Re: 69Cuda340S] #57885
05/07/08 11:06 PM
05/07/08 11:06 PM
Joined: Sep 2006
Posts: 2,587
missouri, USA
moparmojo Offline
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Well I guess, I might want to fully explain the issue with your intended machine shop. Get their direct rationale for why extra money is needed from you when the kit is supposed to be balanced already. I would also ask that if it is within tolerance that your machine eat the cost to double check, or if he is unwilling to do that, then I would suggest you advise him you would expect that if you do pay him to balance and go over they you make the tolerances even more exact. If you are stuck paying for it, you might as well get an even better product out of it in the end. So if the initial quality turns out good, and the machinist still requires additional work, then I would set expectations high for what you want in return.

Re: Scat Kit Bearing and Balance Quality [Re: 69Cuda340S] #57886
05/07/08 11:54 PM
05/07/08 11:54 PM
Joined: Jan 2003
Posts: 30,947
Oregon
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AndyF Offline
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Oregon
If the SCAT kit is in balance then it won't take long to double check it. They'll just weigh the parts, make up the bobweight and spin the crank. If it all checks out it doesn't take long to do. It is a lot cheaper to check it now than to fix it later.

Re: Scat Kit Bearing and Balance Quality [Re: AndyF] #57887
05/08/08 12:04 PM
05/08/08 12:04 PM
Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S Offline OP
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69Cuda340S  Offline OP
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MARYLAND
Thanks for the feedback. I called Scat and they say they guarantee that their balanced kits with be correctly balanced and the bearing surfaces will be within specs. I have decided to spend the extra money to have it fully checked out by my local machine shop anyway. This is the foundation of the engine and I want to make sure its right.

Re: Scat Kit Bearing and Balance Quality [Re: 69Cuda340S] #57888
05/08/08 12:36 PM
05/08/08 12:36 PM
Joined: Jan 2003
Posts: 30,947
Oregon
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AndyF Offline
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AndyF  Offline
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Posts: 30,947
Oregon
I'd always do a double check, even if you're buying parts from the best engine builder in the world. Stuff happens, maybe the kid on the dock at SCAT puts the balanced rods into a box with a different crankshaft or something like that.

I got a complete rotating assembly once from a highly respected engine builder and when we put it together the crank wouldn't rotate. It turns out the bearing mfg had mistakenly put some +010 bearings into the std bearing box. To make it even worse, the +010 bearings were stamped STD on the back side. Only way we ever figured it out was to take all of the bearings out of the motor and measure each one with a bearing mic.

Re: Scat Kit Bearing and Balance Quality [Re: AndyF] #57889
05/09/08 09:49 PM
05/09/08 09:49 PM
Joined: Jul 2006
Posts: 106
Waterloo Iowa
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80mirada Offline
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Waterloo Iowa
Most of the ford, shibbey, and pontiac builders are all swearing by scat around here. They were all very impressed with the quality and the balance job, not to mention the price. The fact that a local mustang racer said his motors are holding up better than some of the others.

Re: Scat Kit Bearing and Balance Quality [Re: 80mirada] #57890
06/05/08 06:37 PM
06/05/08 06:37 PM
Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S Offline OP
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69Cuda340S  Offline OP
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MARYLAND
UPDATE: the kit came in and the local shop went over the balance job. All the pistons were off a gram or two. Some, but not all, rods needed some grinding to get them balanced. The crank was off 6 grams on one end and 15 grams on the other. Bearing clearances were "beautiful" according to the shop. Only problem was there was a small flaw in the number 1/2 rod journal. It was a "dent" about 1/2" long, 1/16" wide, about .005" deep and perpendicular to the crank center line. It was very smooth and polished but you could see and feel the flaw. Local shop said it would not cause a problem but recommended it be returned for a replacement. So waiting on that now.

I wouldn't buy a balanced kit from them again. I'd buy it unbalanced and have a good local shop do it right. A guy over on abodyjoe.com site had his "balanced" Scat kit's pistons off by a few grams. And he is complaining to Scat and they don't want to do anything about it. The balancing dept. told him "what do you expect for $150?"

So don't waste your money on the balance job from Scat. They don't do it right and when its off and you complain they won't do anything for you.







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