Charlie, I have one of Lou Ross’s PSRUs and I was surprised when converting over to Tracy’s PSRU to find that the diameter of the Ross flywheel was 1” smaller in diameter – didn’t realize this until I stuck the starter into the Tracy mount and found it’s drive gear was approx 1/2” away from the teeth on the flywheel.  So had to ditch it and go find a more recent version.

 

Ed

 

From: Charlie England

Sent: Tuesday, May 20, 2014 9:20 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: flexplate / flywheel saga continued

 

Hmm... this is curious. The seller says 'fits 86-91', so that should be 2nd gen. I wonder if the turbo flywheel is larger diameter (same diameter as the flexplate). Guess I'll call Fidanza & ask, before I contact the seller.

Just out of curiosity, would it be possible to just move the starter closer to the e-shaft centerline to match the smaller flywheel? (I do have mine mounted on the plugs side of the engine).

I don't really expect to need this flywheel, but if it's useable, I'll hang on to it.

Thanks for the help,

Charlie

On 5/20/2014 5:03 PM, Tracy wrote:

I bought 2 aluminum racing flywheels for RX-7, one new and One used.   Both were same diameter as 2nd gen flex plate although the seller said they also fit RX-8. 

 

I am not familiar with the " FB or FC " terminology.   I'm wondering if they mean it is a 1st gen RX7.   I would assume FC means 2nd gen since 3rd gen is FD.

 

Tracy

Sent from my iPad

On May 20, 2014, at 15:25, "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

<AL flywheel.JPG>

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