Return-Path: Received: from mail06.syd.optusnet.com.au ([211.29.132.187] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP-TLS id 824590 for flyrotary@lancaironline.net; Sat, 26 Mar 2005 23:33:28 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.187; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-189-94.dsl.nsw.optusnet.com.au [211.31.189.94]) by mail06.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j2R4WcXr016515 for ; Sun, 27 Mar 2005 14:32:39 +1000 Message-ID: <001101c53286$75312a50$5ebd1fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: [FlyRotary]RX8 P-Port Date: Sun, 27 Mar 2005 14:35:51 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C532DA.4696E280" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C532DA.4696E280 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ken, It has already been done. The local Rotary specialist has suggested a = slight skim off the rotor sides otherwise they bind-up with High RPM = (over what we are seeing), but I will get mine done anyway. The biggest problem I see is that the side compression seals are a = little short compared to the RX8 - however I'm yet to see it physically. = It may be that the racing crowd want a really tight compression seal - = the normal side seals aren't that close.=20 There is an extra inside compression ( metal) seal and the specialist = felt that this was to minimize and blow-by of the gappy side seals - = that will do me. There are 3 sizes of side seals to choose from, but you can't use Rx7 = seals - so I believe. Some have overcome this by using oversized apex = corner seals. Your suggestion on apex seals is in line with the local specialist. I will check those measurement for you, but I would suggest that these = chaps racing have 'been there and done that' and are using them, so they = do 'fit the hole'! George (down under) Hi George, I don't think we need to worry about apex seals in a non-turbo motor. = Tracy's or Hurley's 2mm seals will never break in a NA motor since there = is no problem with detonation. I just took some measurements of a '88 = 13b rotor: width measurements around the outside of the rotor showed = 3.136 - 3.139 inches. Inside measurements from the gear face to the = opposite side of the rotor (measured inside the bearing shell) was 3.144 = to 3.145 inches. I do not have micrometers large enough to measure from = an apex seal groove to the opposite curved face of the rotor. I don't = have CAD capability so I can't send a drawing; can someone draw this up = for us??? We need to compare these measurements to a RX8 rotor to see = if the RX8 rotor will fit in the 'hole' of the earlier 13b's. Ken Powell=20 Bryant, Arkansas=20 501-847-4721 -------------- Original message --------------=20 Ken,=20 That's very true, and what I plan on doing for the single, do you = think it's worth going to 3mm for a non - turbo single rotor? The RX8 rotors are dirt cheap ( compared to new RX8 rotors) What = dimensions do you want measured - I will do it for you! George ( down under) I don't see the need for a 'bridged' intake port on the RX8 = engine. The RX8 also uses a 2mm apex seal; I think we can grind the RX8 = rotor apex seal groove to the same depth as the older rotors then use = Tracy's or Hurley's 2mm spex seals in a peripheral ported Renesis. You = should be also be able to use the lighter 8.7 lb RX8 rotors in the = older engines if you get the rotating assembly balanced. Wish I had a = RX8 rotor so I could measure the critical dimensions (but not bad enough = to buy one!(grin)). Ken Powell=20 Bryant, Arkansas=20 501-847-4721 ------=_NextPart_000_000E_01C532DA.4696E280 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ken,
It has already been done. The local = Rotary=20 specialist has suggested a slight skim off the rotor = sides  otherwise=20 they bind-up with High RPM (over what we are seeing), but I will get = mine done=20 anyway.
 
The biggest problem I see is that the = side=20 compression seals are a little short compared to the RX8 - however I'm = yet to=20 see it physically. It may be that the racing crowd want a really tight=20 compression seal - the normal side seals aren't that close. =
 
There is an extra inside compression ( = metal) seal=20 and the specialist felt that this was to minimize and blow-by of = the gappy=20 side seals - that will do me.
 
There are 3 sizes of side seals to = choose from, but=20 you can't use Rx7 seals - so I believe. Some have overcome this by using = oversized apex corner seals.
 
Your suggestion on apex seals is in = line with the=20 local specialist.
I will check those measurement for you, = but I would=20 suggest that these chaps racing have 'been there and done that' and are = using=20 them, so they do 'fit the = hole'!
George (down under)
Hi George,
I don't think we need to worry about apex seals in a non-turbo=20 motor.  Tracy's or Hurley's 2mm seals will never break in a NA = motor=20 since there is no problem with detonation.  I just took some = measurements=20 of a '88 13b rotor:  width measurements around the outside of the = rotor=20 showed 3.136 - 3.139 inches.  Inside measurements from the gear = face to=20 the opposite side of the rotor (measured inside the bearing shell) was = 3.144=20 to 3.145 inches.  I do not have micrometers large enough to = measure from=20 an apex seal groove to the opposite curved face of the rotor.  I = don't=20 have CAD capability so I can't send a drawing; can someone draw this = up for=20 us???  We need to compare these measurements to a RX8 rotor to = see if the=20 RX8 rotor will fit in the 'hole' of the earlier 13b's.

Ken Powell
Bryant, Arkansas
501-847-4721
 
--------------=20 Original message --------------
Ken,
That's very true, and what I plan = on doing for=20 the single, do you think it's worth going to 3mm for a non - turbo = single=20 rotor?
 
The RX8 rotors are dirt cheap ( = compared to new=20 RX8 rotors) What dimensions do you want measured - I will do it = for=20 you!
George ( down = under)
I don't see the need for a 'bridged' intake port on the RX8=20 engine.  The RX8 also uses a 2mm apex seal; I think we can = grind the=20 RX8 rotor apex seal groove to the same depth as the older rotors = then use=20 Tracy's or Hurley's 2mm spex seals in a peripheral ported = Renesis. =20 You should be also be able to use the lighter 8.7 lb RX8 = rotors in=20 the  older engines if you get the rotating assembly = balanced. =20 Wish I had a RX8 rotor so I could measure the critical dimensions = (but not=20 bad enough to buy one!(grin)).

Ken Powell
Bryant, Arkansas
501-847-4721
=
 
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