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Re: Flywheel:How lite is too lite?

To: "Robert M. Lang" <lang@isis.mit.edu>, 6-Pack <6pack@Autox.Team.Net>,
Subject: Re: Flywheel:How lite is too lite?
From: John Mitchell <jmitch@snet.net>
Date: Fri, 10 Dec 2004 11:24:01 -0500
Just to clarify, the flywheel is one made by PRI in Oregon.  Looks well 
crafted.  Anyone had experience?   John    http://www.prirace.com/engine.htm

Robert M. Lang wrote:

>On Thu, 9 Dec 2004, John Mitchell wrote:
>
>  
>
>>    I have a 19lb flywheel now, but for my engine rebuild, I've obtained 
>>a wheel lightened to about 12lbs.   Is this too lite for street use?   
>>What kind of problems , if any can I expect.     Thanks in Advance,   
>>John Mitchell   76 TR6
>>    
>>
>
>The only problem with a flywheel that's 12 pounds is that it might be
>weakened from loosing all the mass. Presuming that your crank is the
>late-style, that's easily 1/2 of the stock flywheel weight, maybe a tad
>more. That's a lot of metal to shed and still maintain reasonable
>strength.
>
>I'm not sure I'd go that light for a flywheel that is not routinely
>checked for cracks.
>
>As far as drivability, 12 pounds would be no problem. Keep in mind two
>things about flywheel mass as it related to TR6's - the stock crank weighs
>in at darn close to 80 pounds... losing 12 pounds at one end is not
>reducing the rotasting mass that much... HOWEVER - losing weight at the
>flywheel is good because you take most of the weight off at the outside of
>the wheel where it actually puts more stress on the last crank throw...
>losing weight on the flywheel is always good for a TR6 motor. Period. If
>you spin the motor more than the stock 5800 RPM redline, losing weight on
>the flywheel is ESSENTIAL.




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