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Date: Fri, 15 Jul 2011 09:53:33 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Ok Here are the important flywheel measurements
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William Wilson wrote:
> I'd recommend getting a turbo starter to go with the turbo flywheel.  It 
> should bolt right on.  The flywheel assembly spins pretty fast and needs 
> to be balanced, I wouldn't trust welding there, or at least not MY 
> welding :)  I think starters are physically interchangeable for all 
> turbo cars from 86 on plus RX-8s, but to be absolutely sure you could 
> also match the series of car.  (You can probably find an RX-8 in a local 
> junkyard).

why not just add a spacer made of 1/4" aluminum plate?


> 
> On Thu, Jul 14, 2011 at 10:41 PM, David Leonard <wdleonard@gmail.com 
> <mailto:wdleonard@gmail.com>> wrote:
> 
>     I finally got to the hangar and measured out my S5 turbo flywheel
>     and the remains of my S5 flexplate.  The results are very
>     encouraging, even as good as the possibly could be to make the swap,
>     but I only had ten min at the hangar before I had to leave to pick
>     up my daughter from daycare, so they are one try and slightly
>     sloppy... I make no guarantees.  The height measurements of the flex
>     plate were particularly suspect because, well, mine is all warped
>     and broken.
> 
>     *Ring Gear Diameter* - Perfect fit.  As we suspected, same size,
>     same tooth spacing.
> 
>     *Ring Gear Fore-Aft Placement* - As measured from the underside of
>     the big nut. (for all further reference, aft means aft in the CAR). 
>     The flex plate puts the aft side of the ring gear 1.290 inches from
>     the front of the big nut. The flywheel puts it 0.913.  So the flex
>     plate puts the ring gear (appx) 0.377 in. further aft.  This is
>     actually fortuitous because it just so happens that the ring gear
>     thickness is .365 ...    So all we have to do to fix the discrepancy
>     is weld and extra ring gears onto to the flywheel ring gear and
>     there will be teeth that the starter can reach:(bottom of the page..
>     the cost $80)
>     http://mazdatrix.com/flywheel.htm
>     It may also be possible to fix the discrepancy by changing the
>     starter... will look into that.
> 
>     *Damper Plate Placement* - On the flywheel, the mounting surface is
>     proud (or aft) of the ring gear.  On the flex plate, the mounting
>     surface is recessed (or forward) from the ring gear. And it all
>     pretty much works out.  That position on the flywheel will vary
>     somewhat depending on which flywheel you have and how much wear you
>     have on the clutch slip surface. But on my (I assume well-worn)
>     flywheel the placement was 0.965 while the flex plate was 0.950. 
>     Pretty damn close and given measurement error it might me meant to
>     be right on.  Or, any difference could be made up by trimming down
>     the spline on the damper plate or removing or adding spacers between
>     the two.
> 
>     So in my mind, a flywheel is the way to go.  Stout, easy to get,
>     pick your weight, only mods seem to be drilling the mounting holes
>     and welding on a second gear ring.
> 
>     -- 
>     David Leonard
> 
>     Turbo Rotary RV-6 N4VY
>     http://N4VY.RotaryRoster.net
>     http://RotaryRoster.net
> 
>