: --------------=20 Lynn,=20 I would say my "O"rings fit pretty well and that's the Cosmo = Rotor Housing - see photo. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_001E_01C5B128.9BF0B9A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Kelly,

They are slightly wider - my = information is that=20 for performance engines (read over 8,000 or 9,000 RPM, and upward of = that) they=20 skim the rotor a thou each side to eliminate binding. However = that's=20 that necessary for the rpm we are running, so they say.

It's not uncommon to skim the rotor = apex areas on=20 RX7 performance engines as well due to the high torque flexing the=20 e-shaft.

I think Lynn's explanation seems the = most=20 reasonable to me, on why the power improves with some = running-in.

My opinion FWIW

George (down under)

Tracy,

It has been reported that the Renesis rotors are = slightly=20 wider than

13b rotors........Could there be a little extra friction causeing = the=20 longer

breakin time and gradual power increase along with the wider side =

seals ??

--
Kelly Troyer
Dyke=20 Delta/13B/RD1C/EC2

--------------=20 Original message from "Tracy Crook" <lors01@msn.com>: = --------------

My Renesis was built using the same O-ring kit that RWS sells = for the=20 earlier 13B. TES inner coolant O-ring but Viton oil seal = rings. =20 Works just fine.

Just read the Car & Driver article on long term test of = RX-8. =20 They saw the same long break-in period on the engine that I = did. =20 Compression was terrific from first run on but the power increased = slowly=20 over time. The CD car was significantly faster in the 1/4 mile = after=20 40,000 miles than when new. I still don't know why this should = be. The slightly wider side seals and = exhaust shield on the=20 rotors would not seem like they would cause this much = difference.

Tracy (off to Colorado for 3 weeks)

----- Original Message ----- =

From: Kelly Troyer

To: Rotary motors in = aircraft=20

Sent: Friday, September 02, = 2005 1:32=20 AM

Subject: [FlyRotary] Re: = "O" rings/=20 Exhaust flanges

George,

Now we need one of our Renesis engine = builders to=20 step up and prove

that the coolent seals fit their rotor housings.........Did = you=20 purchase TES

rotor seals from Creavey for your Renesis rotors ?

--
Kelly Troyer
Dyke=20 Delta/13B/RD1C/EC2

--------------=20 Original message from "George Lendich" = <lendich@optusnet.com.au>:=20 --------------

Lynn,

I would say my "O"rings fit = pretty well and=20 that's the Cosmo Rotor Housing - see = photo.

--
Homepage: =20 http://www.flyrotary.com/
Archive and UnSub: =20 = http://mail.lancaironline.net/lists/flyrotary/
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