Just to let you know where I’m coming from on this.  First, I have 3mm Hurley seals installed in my 20B, and don’t relish the thought of tearing it apart to change out the apex seals.  (At the time I was rebuilding my engine, Hurley seals were the seal of choice.)  If they actually are too soft, then I would like to know about it now, not after they ruin my day.  The comment was made that Hurley seals are so soft that they are wearing out pre-maturely.  It would be a good yardstick to have the numbers on the stock Mazda seals as well to use as a reference point to know how the Hurley seals compare.

 

Mark    

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy
Sent: Monday, April 25, 2005 1:30 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Soft Seals Sloppy slots S^4

 

Rusty, Mark

I have access to the equipment to perform a Rockwell Hardness test.  If you want you can send the old seals to me and I could have the test run the day after I receive them.  Let me know .

 

Hi Bob,

 

If Ed wants to send a piece of his broken seal, I'm certainly game to send one of my seals also.  I'm not really sure what we'll prove by this, other than finding out if Ed's seal was sub-Hurley-standard hardness.  We don't know what hardness is required, or desired, so having a figure for the standard Hurley wouldn't seem to serve any purpose to me.     

 

BTW Ed, I would absolutely not install those odd plugs until you get home.  It certainly sounds like they weren't hitting anything, but do you know that the ground electrode wasn't glowing red, and causing pre-ignition, or causing some other odd problem that we don't understand?  Even if you don't believe those plugs will cause any problems at all, why take even a slight chance until you get home and can circle your own field for testing?

 

Rusty