#1  
Old 10-12-2019, 12:30 PM
BobC BobC is offline
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Default 455 HO crank balance experience

I got a recommendation for a shop to balance my rotating assembly. Hereís some pics of areas that are of concern to me. I will readily admit to not knowing squat about crank balancing. There are people that know on this site and Iíd appreciate your input. The shop admitted they over drilled on one of the holes. To compensate they removed material from the flywheel/ flex plate mounting flange. The drilled hole diameter in the photo is so big that you can see the distortion in the side of the counter weight. I need to determine if this crank is now junk.

The pressure plate pic shows what the shop said was needed to balance it.

The shop balanced with the factory flexplate and after market flywheel. They both balanced the same which is good because I ordered the factory external balance flywheel.
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  #2  
Old 10-12-2019, 01:52 PM
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It's not the best to look at but it won't cause you a problem. Once the engine it together and running you'll forget about it and it will be a "non-issue".
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Old 10-12-2019, 01:54 PM
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Originally Posted by PAUL K View Post
It's not the best to look at but it won't cause you a problem. Once the engine it together and running you'll forget about it and it will be a "non-issue".
X 2, Paul. I wonder WHY the didnít add a bit of Mallory metal instead of going to all the trouble with the extra machining?
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Old 10-12-2019, 01:58 PM
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Seen worse from the factory...
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Old 10-12-2019, 04:15 PM
Schurkey Schurkey is offline
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I have little to say about the pressure plate, except that I'd be unhappy. If the manufacturer can't get the balance right, I'd have preferred to ship it back to them and get a different one. Maybe that's why I don't own a manual-transmission vehicle any more--too picky.

I wouldn't be overly concerned about the crankshaft. Removing weight like they did might cause some minor rocking-couple out-of-balance, but the crank has so much rocking-couple designed-in already; and I don't have a way to know if what they did would make it worse...or better.

Why would you "order a factory external-balance flywheel" if you own an aftermarket flywheel that balances properly? Seems to me like you're paying extra to put a bomb under the floorboards. I hope you have a scatter shield. (I'm assuming the aftermarket flywheel is steel and not cast-iron. Maybe I'm wrong.)
  #6  
Old 10-12-2019, 05:41 PM
BobC BobC is offline
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Thanks for the feedback, I appreciate it.
The engine was from an automatic ‘71 TA. They balanced it with the factory flex plate. They then bolted on the American Powertrain FWPO-10001 billet steel flywheel which is externally balanced. It balanced the same as the flexplate. It’s going to be a manual transmission car but if I decide to change back to an automatic I can without losing the engine balance.
The clutch kit is a RAM HDX. I’m going to contact them about the balance. I hope I’m not building a bomb. I plan on using the aluminum repop bellhousing. The reason I went with a billet steel flywheel and this clutch was for some insurance over the factory cast iron parts. The vehicle is for street use. 20/20 hindsight I probably should have gone internally balanced.
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Old 10-12-2019, 06:39 PM
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I don't understand. You have a steel flywheel that balances properly. Then you order a "Factory", presumably cast-iron flywheel to use instead of the steel one???

Or are you saying the steel flywheel has the standard "factory" balance?
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Old 10-12-2019, 07:17 PM
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That's the worst butchery I have ever seen for a balance job. I have never seen any grinding on a clutch to balance a rotating assembly besides the flywheel. I would be very dubious of that job especially if I am seeing the clutch alteration correctly.
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  #9  
Old 10-12-2019, 08:22 PM
BobC BobC is offline
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Yes, the steel flywheel has the standard "factory" balance.

I agree on the butchery. Bob Morton in Independence, MO did the work. Heís been in business for decades so I was hoping for a professional job. There wasnít any grinding on the pressure plate to remove weight, thatís some nasty looking weld thatís been added to achieve balance.
The rotating assembly was first balanced without the pressure plate. The pressure plate was then installed and modified to maintain the balance.

Joe Hand is doing the engine assembly. Heís going to have some local people check it out too.
  #10  
Old 10-12-2019, 08:33 PM
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Crank drill-hole looks typical.

Flexplate and Steel FW sound like they were a success.

Pressureplate sounds like they had to fix someone else's crap, so looks wont matter to them.
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Old 10-12-2019, 09:20 PM
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There was no need to factory balance the rotating assembly especially if you might change from an auto to manual, factory had a small external balance on the flywheel that is easy to internally balance and makes switching easy. I have never had to have mallory added to balance any assembly (small amount of weld though) from stock components to lighter weight aftermarket ones, or have material removed from the flywheel flange. The clutch and flywheel are typically neutral balanced as an assembly separate from the rotating assembly which is typically neutral balanced from my experience, doesn't mean that's the only way though.
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1967 Firechicken, 461, Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3520#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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Old 10-12-2019, 09:43 PM
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Quote:
Originally Posted by AG View Post
That's the worst butchery I have ever seen for a balance job. I have never seen any grinding on a clutch to balance a rotating assembly besides the flywheel. I would be very dubious of that job especially if I am seeing the clutch alteration correctly.
.
.


That's amateure butchery.....this is the Big League stuff ;
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Old 10-13-2019, 09:03 AM
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Wow! That must be one lightweight rotating assembly, at least they didn't grind down the flywheel flange.
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1967 Firechicken, 461, Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3520#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
  #14  
Old 10-13-2019, 09:09 AM
hurryinhoosier62 hurryinhoosier62 is offline
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Quote:
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That's amateure butchery.....this is the Big League stuff ;
Paul, was the crank balancer operator having a bad day? Sheez......
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Old 10-13-2019, 09:23 AM
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Quote:
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That's amateure butchery.....this is the Big League stuff ;
Got a spare set of rods to sell? might match my lightened crank.
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