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Old 03-24-2012, 08:45 PM
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Eagle cranks

Hi,
This is my first time posting here I hope I can get an answer for the issue that a freind of mine is having?

First I will give a little history of what is going on. At the end of last years racing season my friend blew his 468 BB Chevy engine after launching it at the start line. He runs a liberty 5 speed. Over the winter he built a new motor, 565 BB Chevy, Dart block with a Eagle crank. The issues he is having is that he wants to use a roller bearing in the crank as opposed to a bronze bushing. The eagle crank will not accept the roller bearing, will not go in deep enough to have the proper clearence. He has 3 stock Chevy cranks that we checked out and they all will accept the roller bearing.

Any one else have this problem?
Is this the way all Eagle cranks come?
Any one know what the depth of a Eagle crank suppose to be to accept a roller bearing?


Thanks
Steve B

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Old 03-24-2012, 09:05 PM
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A dart block, a liberty trans, and a cheap knock off crank????

Eagles can work in some mild builds but why would you spend the money on all that nice stuff and risk it all on a failure prone crank.
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Old 03-25-2012, 01:09 AM
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Iam with ap72. How did an eagle get mixed in with all the good stuff!!
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Old 03-25-2012, 06:22 AM
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Quote:
Originally Posted by 406bug
Iam with ap72. How did an eagle get mixed in with all the good stuff!!
He has been using the Liberty for 3 years. As for the motor build and the crank that was his call not mine, just trying to help him out. I just find it hard that the crank will not accept the roller bearing.

Steve B
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Old 03-25-2012, 07:45 AM
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īScuse my ignorance but how do you get roller bearings on a V8 crank.
I admit to having a roller bearing on a motorcycle crank, but that was one cylinder and the crank a two piece pressed together.
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Old 03-25-2012, 07:51 AM
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I know that Honda sports cars back in the '60's or '70's had roller mains, zero oil pressure and unreal rpm potential. Like malc, I wonder who makes that conversion for an American V-8, and how does it lubricate the rest of the motor, since it would have zero oil pressure at the crank, squirters????
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Old 03-25-2012, 07:57 AM
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Roller Bearing???

Hi,I believe hes talking of using a ROLLER BEARING,in place of a bronze THROW OUT BEARING.in the end of the crank that the trans output shaft fits into.
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Old 03-25-2012, 08:05 AM
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Quote:
Originally Posted by boatbob2
Hi,I believe hes talking of using a ROLLER BEARING,in place of a bronze THROW OUT BEARING.in the end of the crank that the trans output shaft fits into.
I would have to say its the pilot bushing not the throw out bearing!!!
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Old 03-25-2012, 08:16 AM
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Quote:
Originally Posted by 69gp
Hi,
This is my first time posting here I hope I can get an answer for the issue that a freind of mine is having?

First I will give a little history of what is going on. At the end of last years racing season my friend blew his 468 BB Chevy engine after launching it at the start line. He runs a liberty 5 speed. Over the winter he built a new motor, 565 BB Chevy, Dart block with a Eagle crank. The issues he is having is that he wants to use a roller bearing in the crank as opposed to a bronze bushing. The eagle crank will not accept the roller bearing, will not go in deep enough to have the proper clearence. He has 3 stock Chevy cranks that we checked out and they all will accept the roller bearing.

Any one else have this problem?
Is this the way all Eagle cranks come?
Any one know what the depth of a Eagle crank suppose to be to accept a roller bearing?


Thanks
Steve B
The depth needs to be sufficient for the pilot bearing to go into the crank w/o standing proud of the hole.

If the crank has insufficient depth for the rolling element pilot bearing he's trying to use- and he just has to have a roller bearing- I'd suggest he look into a bearing from a different manufacturer. If no other bearing is short enough, the next choice is to decide whether the bearing is worth machining the crank for, or if using a pilot bushing is the better solution.

I can tell you right now, I'd be using a bushing anyway. Non fluted, non magnetic, oilite-type bushing. Period. This type bushing is not prone to doing anything but what it is supposed to do, and will do so w/a minimum of hassle and expense.

A page on pilot bushings/bearings.
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Old 03-25-2012, 09:54 AM
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Cnc is right, its the pilot bearing vs pilot bushing problem. The OP worded the problem wrong but the explination helps clarify the problem. FWIW a good bushing with a dab of bearing grease should work just fine.
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Old 03-25-2012, 11:15 AM
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Quote:
Originally Posted by ap72
Cnc is right, its the pilot bearing vs pilot bushing problem. The OP worded the problem wrong but the explination helps clarify the problem. FWIW a good bushing with a dab of bearing grease should work just fine.
No grease! Buy a good gm one, soak it in oil for a couple days, clean it off and run it.
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