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Old 10-21-2004, 09:28 PM
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Balancing and dbl keyway cost?

Hello.
Just curious what the average cost of balancing the pistons n rods cost? Also, whats the rate for having the crank dbl keywayed? What is involved in it? HG

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Old 10-21-2004, 09:38 PM
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balance job on a typical V-8 is about $275.00 or around there.
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Old 10-21-2004, 09:51 PM
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Balancing will range from $125 - 200 (typically). You can add another $65 - 100 for the double keyway. The "double" keyway is actually one keyway cut 180* from the standard keyway (the one the woodruff keys are in to hold your timing gear and dampner) in the snout of your crank. If you are going to run a balancer/dampner you will need to have it cut as well.

I went with a single full length keyway, that is what was recommended to me by Don Hampton. So far so good.

Royce
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Old 10-22-2004, 06:17 AM
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For no more boost then you plan on running you dont need a double keyway. In the 6-10lb boost range you would be wasting your money. I have ran all my blower motors with single keys. I pay 225$ for balancing

Ben
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Old 10-22-2004, 07:37 AM
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Balancing here is $125.

I agree. I don't believe you'll need double keys. I think you've made victim of advertising.
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Old 10-22-2004, 02:17 PM
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Hmmm, you mean building an expensive blower motor someone wouldn't spend the $75 it typically costs to double key a heavy rotating mass like a damper. I'd hate to see the damage it would inflict on it's way out, let alone the liability for wherever it wound up. Even in a street blower setup, the blower puts a lot of strain on the crank snout, and who doesn't get a little crazy once in a while? Aren't we all about overkill?

Balancing in Anchorage cost me $250 and the key-way was $75 - the blower damper came double grooved from ROMAC. My machinist however, didn't like cutting the key-way clear out to the end of the snout, his personal feeling is it could be a problem with the key walking out, I didn't have a problem with that, but don't see it as a real problem.

Larry
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Old 10-22-2004, 05:12 PM
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The cam decision killed me guys. Now I have to figure out if I need to dbl key it????
I'll see what the cost is around here. Do I need to take the crank and balancer both if I do it?
Anyone have any pics or a diagram that shows me exactly what it is your talking about? Im a little confused on it. Tnx, HG
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Old 10-22-2004, 07:54 PM
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SBC cranks snouts are on the small side. This is the reason I did not run a balancer/dampner. I am running a crank hub with a single keyway that is cut the length of the snout. Some guys swear by double keyways and some don't. The guy I bought my blower kit from (Don Hampton) is known as the "Godfather" of blowers and was the first to open a blower shop. He knows his stuff. I was lucky enough to spend a few hours talking to him as he set up my blower. I picked his brain as much as possible. He does not like the idea of a balancer on a SBC (because the crank snouts are weak and that sets the blower pulley out even more which puts more strain on the snout along with the added weight).

I am running 12lbs of boost on pump gas and have not had a problem with the single keyway. To each his own, like I said before it all depends on who you talk to. If your blower manufacturer recommends a double keyway then you should follow their advice. If your machinist tells you to run a double keyway then you should probably follow his lead (just in case there are problems).

My machinist had no problem with the single keyway and crank hub and they have built all kinds of engines (including blown).

I didn't decide on a single or double keyway based on cost. Money was not a problem, just wanted it done right. After doing lots of research I am comfortable with my decision.

Royce
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Old 10-22-2004, 08:38 PM
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I've seen blower motors with crank supports. Has anyone had any experience with them? What kind of bearing do they use that survives the RPM it has to put up with?
I would be using it probably more for show than as a necessity. 10-12 Lbs. Boost on a big block / 1071.

Any brand names or web sites to look for. My blower is a BDS and I don't see anything in their catalog.

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Old 10-22-2004, 09:58 PM
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I want it done right also.
But getting several ideas always throws ya for a loop. Especially when your mind is like mine. LOL
Royce? Did your BDS blower come with a crank hub? If I bought a Weiand blower, could I buy the crank hub seperatly to use? HG
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Old 10-23-2004, 09:18 AM
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My blower is not a BDS, it is a Don Hampton Blower. Yes, it came with a crank hub. You can buy and add a crank hub to any blower setup. The problem is, when they make the drive system up, everything needs to be lined up. I am not sure how Weiand sets theirs up. If you give Holley/Weiand a call they probably have a hub for their kits as well. If you are going to have to mis and match to get what you want it will probably be cheaper to go with a Hampton, BDS, Mooneyham, Kuhl, etc... These kits are all custom, they build them to your specs. The cost is not much higher when it is all said and done.

All you can do is try to digest all the info you get from different sources and then make your own choices. I know what you are going through. If your buddies car runs the way you want yours to, then follow his lead. There is always more than one way to get a job done. I am only offering advice on what I learned over the years. People were nice enough to let me pick their brain so I am trying to return the favor.

There is a good book out there called Street Supercharging by SA designs, I strongly suggest you grab a copy. It will cover all the basics and has a lot of info in it from the pros. It covers bottom ends and what boost levels require what, cam selection, blower selection, etc... You are going to have well over $10K into your engine when it's all said and done, so spend an extra $20 and pick up this book. You will still have questions, trust me. Even the pros have different theories and beliefs.

Royce
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Old 10-23-2004, 12:57 PM
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Thanks royce.
I actually already bought that book and your right, it is good. I pretty much know my setup already. Im following a guys lead that lives dwn the road from me. Im just not sure if he dbl'd his crank key or not. I'll probably do it just for insurance.
I got my kit ordered so Im anxiously awaiting its arrival. Thanks for all the help and ideas everyone. Hg
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