flyrotary@lancaironline.net Mailing List Archive

Charlie,

The really early 12A-13B engines had a smaller diameter flexplate...........The "Ross" redrive uesd this flexplate..........I have a Ross 2.85

drive and I will measure it as soon as I can get to the hangar.........Send me the exact diameter of the flywheel you have..........

Kelly Troyer

On Tue, May 20, 2014 at 5:09 PM, Rogers, Bob J. <flyrotary@lancaironline.net> wrote:

Charlie,

I think there is a difference (in diameter) between the automatic transmission flex plate that you currently have and a manual transmission flywheel. I suspect that the flywheel you bought is for a manual transmission engine.

Bob J. Rogers

Mustang II, 13B Turbo

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, May 20, 2014 4:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: flexplate / flywheel saga continued

Hi Charlie,

My flywheel was exactly the same diameter, thought the teeth were closer to the engine a little. I think there may be a difference between the turbo and non- turbo. We hashed all that out a couple years ago.. its in the archives. You can also check the Mazdatrix website to see the different models.

Good Luck,

David Leonard

On Tue, May 20, 2014 at 12:25 PM, Charlie England <flyrotary@lancaironline.net> wrote:

Well, I recently bought a used aluminum flywheel with the following description:

Quote:
RX7 8.5Lb Fidanza Aluminum Flywheel for FB or FC
For sale is a 8.5lb Aluminum Fidanza Flywheel for a RX7 Non Turbo , its used and could use a new friction plate

fits 86-91 Non turbo RX7s might fit Fb 2nd gen RX7s as well i'm not 100% sure

Unquote.

It was reasonably priced, since I don't need the wear surface, so I figured it would be 'plan B' if I ever have an issue with the flex plate.

When it arrived (yesterday, after everyone was gone), I sat it on top of my (cracked) flex plate, and it's almost an inch smaller in diameter. The mounting holes in the center seem to line up properly. I remember reading about milling the drive plate to move the starter .2" closer to the engine, but I don't remember anything about the smaller diameter.

So, my questions:
Did I purchase the wrong item, would I simply make my starter cutout in the plate closer to the centerline to account for the smaller diameter, or was the flywheel mis-represented?

If it's not the described item, I need to send it back, but I don't want to bother the seller if I simply bought the wrong flywheel.

Thanks,

Charlie