"Brian D. Cain" wrote:
Hey guys, this one's for Tracy mainly but also for the group. I'm
very happy to report much
success so far with Tracy's 2mm 2-piece apex seals that he's
providing for us via Rotary
Aviation. There's been alot of buzz about these seals on the forums
but no real data to date
until now. I just recently tore down an engine that we were
building for a race-type of auto
application using these 2mm 2-piece seals as a test after about
4,500 miles of use (just
about all street-driven).
I cleaned up the apex seals and measured two of them. I measured
0.309" and 0.310" in heighth
respectively and widths of 1.93mm. I'm not sure what their stock
heighth is, but if these are
manufactured to stock specs then that's only 0.005" to 0.006" of
wear! An equivalent seal,
a 3mm 2-piece (presumably stock but unsure) design with twice the
miles shows 0.293 and
0.295" of total heighth, a full 0.015" shorter!
So far, I give them a huge thumbs up. They're hard as rocks but not
too hard for the rotor
housing apparently. I noticed that, upon disassembly, the steel
lining of the rotor housing was
nearly mirror finish on both of them. I'm not sure if these seals
have anything to do with that
but I find it odd because these housings are not new.
The only potential long-term issue that I might see happening is
accelerated wear of the
"pressure" side of the rotor's apex seal groove -> the part of the
groove that the apex seal is
constantly pushes up against. I regret that I didn't measure the
apex seals when they were
new and I also didn't measure the both rotors' apex seal grooves
before or after so I have no
numbers for you guys here. I apologize for this.
I'm looking forward to using these seals more most definitely.
B
__________________
Brian D. Cain -/- Grand Prairie, TX -/- bdc196@killspam.comcast.net
bdc@killspam.teamfc3s.org
BDC Motorsports - Performance Rx-7 13B Rebuilds, EFI tuning, etc.
MSN bdc196@killspam.hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ#
1733105
http://bdc.cyberosity.com -/-
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