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FE Power Forums => FE Technical Forum => Topic started by: darren121671 on May 15, 2016, 07:43:35 AM

Title: 1UB Internally Balanced
Post by: darren121671 on May 15, 2016, 07:43:35 AM

Hey guys,
              I was wondering if it's possible to internally balance a cobra jet crankshaft? I recently read a classified ad of a person selling an 427 engine with a 1UB crankshaft that he claims is internally balanced. Is this possible?

Title: Re: 1UB Internally Balanced
Post by: Yellow Truck on May 15, 2016, 08:21:12 AM

Yes.

Title: Re: 1UB Internally Balanced
Post by: fryedaddy on May 15, 2016, 11:57:23 AM

i had my 428 crank int. balanced.now i can use a common 390 flywheel.it is a little costly because that mallory metal used to add weight aint cheap

Title: Re: 1UB Internally Balanced
Post by: darren121671 on May 15, 2016, 05:31:32 PM

So it is possible, just with extra expense versus a standard balance job?

Title: Re: 1UB Internally Balanced
Post by: Posi67 on May 15, 2016, 09:50:41 PM

It's done all the time and actually the proper way to go. Depending on the piston/rod combo you should see about 3 slugs Mallory metal on the back counterweight and maybe elsewhere. Internal balance of that crank will have other tell tail signs but the added weight is the most obvious.

Title: Re: 1UB Internally Balanced
Post by: darren121671 on May 18, 2016, 08:52:44 PM

Thanks guys. That's what I wanted to know.

Title: Re: 1UB Internally Balanced
Post by: Qikbbstang on May 24, 2016, 07:59:49 AM

Ironically my 428 cranks (that I shipped all the way to Ark Ak to be machined) is being done right now for my 427. I will be tickled green ($$$) if it only takes 3 slugs - I'm expecting more

Title: Re: 1UB Internally Balanced
Post by: fryedaddy on May 24, 2016, 11:46:15 AM

i ended up spending a grand on my crank