Just Balanced 402 Rotating Assembly from SDPC

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Dec 17, 2006 | 11:00 PM

White_Hawk

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From: Pontiac, MI

Just Balanced 402 Rotating Assembly from SDPC

I just wanted to post and let everyone know how the balance went. There is always talk around about how hard it can be to balance with Eagle cranks. My balance went fine, and the crank only needed to be drilled. Fine other than having to sharpen the drill bit about 50 times, that is, due to the hardness of the crank.

It was an 4" Eagle crank, Scat rods, with SDPC -14 cc Diamond pistons. The thing balanced great. Hopefully I will have it bolted together by New Years.

-Geoff

Dec 18, 2006 | 07:01 AM

SideStep

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Originally Posted by White_Hawk

SWEET! keep us informed...

Dec 18, 2006 | 12:17 PM

PAGregSS

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From: Danville,PA

Good to hear, especially since I'll be taking an Eagle crank to my engine builder who does not like Eagle stuff.

Dec 18, 2006 | 02:02 PM

Ryan02SS

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From: Lake Anna, VA/ Fairmont, WV

I just had my Eagle balanced with no problems. I think the main problem comes down to unskilled operator shortcomings.

Dec 18, 2006 | 10:54 PM

White_Hawk

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From: Pontiac, MI

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Originally Posted by Ryan02SS

I just had my Eagle balanced with no problems. I think the main problem comes down to unskilled operator shortcomings.

I agree. In fact, I am starting to believe the whole "Eagle balance problem" is just a myth, or at least based on some early crankshafts and not on what is in the market today. My guy knew it would balance with just drilling right after he calculated the bob-weights. I have a hunch that SDPC may have set up the reciprocating mass to make it happen like this too.

-Geoff

Dec 19, 2006 | 08:45 AM

99Fbody99

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Originally Posted by White_Hawk

Well, Im sure if you post this in a different section you will get a better answer. But I can tell you early on the cranks were light on target bob weight (and few reluctor issues) which is what caused the most of the balance issues. They still have issues on heavy bob weight rotating (Hd FI applications) assemblies that require adding Mallory at $100 a slug.

Dave

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