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Whew! Thanks for the words of encouragement. For a minute there I thought that I would have to pull my engine and tear it down just to replace some defective part(s). If I ever decide to turbo-charge, then I will change them.
I was in attendance at the seal breaking demo at your annual fly-in. Very impressive!
Mark S.
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From: Rotary motors in aircraft on behalf of Tracy Crook
Sent: Tue 8/1/2006 1:30 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 20B back together
As you said, the Hurleys were the hot ticket back when my 20B was built. During the past several years I have seen many of them fail (mostly in turbo engines in cars) and done some informal tests on them (take seal between thumb and forefingers and snap them fairly easily). I simply lost confidence in them. To be fair, they will probably work fine in normally aspirated engines where the rotor grooves are in good shape, especially since you are using 3 mm seals which should be stronger.
The other factor is the 'company motto' for RWS which reads "We Fly what we Build", so since we now make apex seals I was virtually obligated to do it.
Tracy
----- Original Message -----
From: Mark R Steitle <mailto:mark.steitle@austin.utexas.edu>
To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
Sent: Wednesday, July 26, 2006 10:42 AM
Subject: [FlyRotary] Re: 20B back together
Tracy,
Can you expound on the need to replace the Hurley seals. I have the 3mm Hurley seals in my 20B, with about 10 hours of ground running. At the time I was rebuilding my engine Hurley seals were the best seals to use, or so I was told. So, what's changed? I also have the TES o-rings installed throughout.
Thanks,
Mark S.
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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Wednesday, July 26, 2006 9:00 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 20B back together
The tear down and apex seal replacement job on my 20B turned out to be a 6 day ordeal instead of a quick 2 hour job but it's done and I can get back to finishing the RV-8 again. Most of the problems were caused by inexperience (haven't had to tear down a rotary in over 12 years) and the fact that this was not a standard 20B but a mongrel built out of mostly 13B parts. I went ahead and replaced the stock coolant O-rings with TES parts while replacing the Hurley apex seals.
Tracy (packing old GPS in plane for backup)
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