Mailing List flyrotary@lancaironline.net Message #20683
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: WARNING V Grooves
Date: Sat, 23 Apr 2005 17:24:58 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
I don't how I missed it before, but I was reading over the helpful instruction set that Tracy sends out with the Overhaul Kit.  There is only ONE thing that they suggest checking on your rotary engine.
 
Quote:  " Check the apex seal groove carefully.  The stock seals tend to wear a "V" shape at the opening (mouth) of the groove (rotor).  If the grooves have been "V'ed" more than 0.010" clearance, (a groove opening width of more than 0.125") your rotor MUST be replaced or machined to accept 3mm apex seals.  The overall seal to rotor clearance should be 0.002 to 0.006".                 I added the red and bold to the "must" in the statement (Ed)
 
So I think its quite clear that Bruce T (whom I assume provided the input on the instructions) feels that "V" apex grooves could lead to BAD things.  Now my V was outside Mazda spec but within the limits of above - however, if all the factors stack up against you at the same time, perhaps bad things could happen before you reach the above limit.
 
FWIW
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
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