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Re: flywheel "runout"

To: "R. Kastner" <kaskas@earthlink.net>
Subject: Re: flywheel "runout"
From: "Mordy Dunst" <gasket.works@gte.net>
Date: Thu, 2 Aug 2001 18:04:41 -0500
Thanks...
Mordy Dunst
Gasket Works USA, LLC
www.headgasket.com
626-358-1616 voice/fax


----- Original Message -----
From: "R. Kastner" <kaskas@earthlink.net>
To: "Mordy Dunst" <gasket.works@gte.net>
Sent: Thursday, August 02, 2001 4:42 PM
Subject: Re: flywheel "runout"


> Yeah, Mordy hard bolts are the ticket. Hard meaning very very limited
> stretch.  The same is true for con rod bolts.  The problems occur when the
> vibration occurs in the crank and the flywheel tends to amplify this
> movement ( due to diameter) , the flywheel is acting like a big pry bar
and
> trying to wrest the flywheel off the back of the crank.  This then tends
to
> stretch the bolts and the flywheel then is loose and somewhere along the
> line flies off or is so loose it is necessary to take it down anyway.
Grade
> 8 bolt aren't much better in this  application  The NASCAR guys have good
> stuff for this .     Kas Kastner
> ----- Original Message -----
> From: "Mordy Dunst" <gasket.works@gte.net>
> To: <fot@autox.team.net>
> Sent: Thursday, August 02, 2001 6:12 AM
> Subject: flywheel "runout"
>
>
> > I'm of the opinion and subscribe to the concept that AN fasteners are
very
> > good for a host of applications except for flywheels.  I beleive
sometime
> in
> > the remote past Mr. Kastner indicated that flywheels ought to be fitted
> with
> > the hardest and non-stretching bolt available. If  I recall my #'s AN
and
> > grade 5 SAE are similar in tensile stregnth and can flex a bit before
> > breaking.  This "give" may be ok in certain applications but, flywheel
> > wobble at high RPM/harmonics is not that place.
> >
> > I once checked flywheel runout and was surpirsed to see variations in
> > flywheels that I thought were good.  I think that all flywheels ought to
> be
> > checked for runout...
> >
> > Truthfully...who checks flywheel runout when assembling the motor?
> >
> > I used a Ford off -the- shelf flywheel bolts (They are  cheap..)  They
are
> > 7/16" and just a bit longer but, it has a good shoulder and the excess
> > threads were cut off with and abraisive wheel. Obviously, the crankshaft
> > holes were also enlarged to accomodate this bolt.
> >
> > Mordy

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