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Excellent; a Dave two-fer! ;-)
Were you converting a regular 2.85 drive, & used the same spline hub from Tracy's original damper plate?
I'd love to see pics of what you did. It sounds like it was a relatively simple mod to do, at least for my machinist neighbor with a lathe & mill.
Thanks,
Charlie Hello Charlie, No I don’t remember what the flywheel weighed, but weighing parts, my installation weighed 3 lbs. more than the original assembly. My aluminum flywheel is smaller than the flexplate, so I had to move the starter. I took nothing from the disk surface except to remove the steel face. My smaller resized spline hub was made to fit where the steel clutch face was originally. The only machining done to the flywheel was to bore the six mounting holes for my smaller resized splined hub. Thanks Dave Williams Hi Dave,
Do you remember what that flywheel weighs? Was it the same diameter as the flex plate, or was it smaller, like the non-turbo manual trans flywheels? Did you remove all the disk mating surface to reduce weight, or just enough to mount the damper plate?
I've got an aluminum manual trans flywheel on the shelf, but it's slightly smaller in dia than the flexplate. Wondering about weight comparisons, mounting, etc.
In more general terms, the flexplates seem to have a rather checkered past even in the car. I've got one that came off the car cracked.
Charlie
On 10/19/2021 11:15 AM, David Leonard wdleonard@gmail.com wrote: I used one of these: I mounted the RWS damper plate. I had to take it to a CNC shop to take down the face and locate the mounting holes. I also had to modify the mounting of the starter, but it was a pretty easy job. Neil, great job on getting your gear-box into production. We sure need it. Hello James, I have a stock 13b ( estimated 150 hp) with RWS equipment. I used a racing aluminum flywheel and removed the steel clutch facing. Then I resized the RWS splined hub to fit. Basically I copied RWS by making a new plate and riveting on the RWS splined hub to my new plate. Because the new plate is a smaller OD I used 6 bolts instead of 4. I used the same durometer rubber cushions. Thanks, Dave Williams From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, October 15, 2021 6:27 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: flex plate Dave, do you have a recommendation for a lightweight flywheel and flexplate/ damper (brand or type) for a 250hp 13b? Thanks, James Whitehurst But you should know that those are prone to cracking, and I had a catastrophic failure of one. They were never designed to carry the output load of the engine, just as a way to engage the starter. Tracey published a revision in the archives, or you can convert a manual fly wheel to work. I suggest lightweight aftermarket versions. Thought so, thanks Can anyone confirm which flex plate fits the RWS redrive? I believe it comes from a 92 model RX7. But is it from an automatic, manual or turbo model? All are different apparently. Thanks Neil.
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