X-Virus-Scanned: clean according to Sophos on Logan.com From: "Bill Bradburry" Received: from vms173023pub.verizon.net ([206.46.173.23] verified) by logan.com (CommuniGate Pro SMTP 6.1c4) with ESMTPS id 7479543 for flyrotary@lancaironline.net; Tue, 10 Feb 2015 11:16:13 -0500 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.23; envelope-from=bbradburry@verizon.net Received: from Desktop ([173.57.170.65]) by vms173023.mailsrvcs.net (Oracle Communications Messaging Server 7.0.5.32.0 64bit (built Jul 16 2014)) with ESMTPA id <0NJK0018ND60IN30@vms173023.mailsrvcs.net> for flyrotary@lancaironline.net; Tue, 10 Feb 2015 10:15:37 -0600 (CST) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.1 cv=LrklEcZZ c=1 sm=1 tr=0 a=jjhB2sdyIRGi5VbALRhQUw==:117 a=kUPQlYmSbg0A:10 a=o1OHuDzbAAAA:8 a=oR5dmqMzAAAA:8 a=-9mUelKeXuEA:10 a=0HtSIViG9nkA:10 a=r77TgQKjGQsHNAKrUKIA:9 a=9iDbn-4jx3cA:10 a=cKsnjEOsciEA:10 a=gZbpxnkM3yUA:10 a=Ia-xEzejAAAA:8 a=Mo_YQtJugoKWnTU58AcA:9 a=CjuIK1q_8ugA:10 a=SSmOFEACAAAA:8 a=yMhMjlubAAAA:8 a=QYCZhQYWNd112vZrbcsA:9 a=0ctgNfzJZglcL6Le:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 To: "'Rotary motors in aircraft'" References: In-reply-to: Subject: RE: [FlyRotary] Re: 20B Engines Date: Tue, 10 Feb 2015 10:15:37 -0600 Message-id: <1AE24C19E89E443F955F45194031CAFA@Desktop> MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_000F_01D0451A.83BECC10" X-Mailer: Microsoft Office Outlook 11 Thread-index: AdBFShoCzGB08o7bRC+Qm1HkHPeYlwAApTiA X-MIMEOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_000F_01D0451A.83BECC10 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Marc. What are the numbers that indicate a later version? Bill _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] Sent: Tuesday, February 10, 2015 9:56 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 20B Engines There are 3 series of 20B engines IIRC. The center housing and the crank on some of the earlier versions was reported to be a weak link....later versions had mods to some internal parts. I have a later version of the 20B. You can tell from the rotor housing engine numbers (where the 20B is in black surround). Marc From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] Sent: Friday, February 06, 2015 4:17 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 20B Engines Thanks Mark........That is the info I was looking for............I happen to have a 13B Cosmo that has the later housings and I had only read about the reinforced housings......... Kelly On Fri, Feb 6, 2015 at 6:49 AM, Mark Steitle wrote: Kelly, I wouldn't hesitate to use an early 20b. The early 20b housings are plenty robust enough for a/c use. The beefier irons could be an issue if you're building a turbo race engine due to the higher loads imposed during up shifting and down shifting. We don't experience any of those loads. I'm pretty certain that my 20b is an early model and I have not experienced any issues with irons cracking around the dowels. The weakest area is along the inner walls of the o-ring grooves nearest the water jackets. If your o-rings aren't to factory specs, you run the risk of cracking an o-ring wall which ruins the housing. Been there, done that. If you treat the engine with the same care you would a certified a/c engine, then you won't have any trouble with longevity. Mark On Fri, Feb 6, 2015 at 12:00 AM, Kelly Troyer wrote: Mark Steitle or other 20B Drivers, I am looking at a 20B that looks to be an early one before they added additional metal in the dowel/oil passage area of the iron housings because of some that I have read developed cracks in this area in service in the autos I presume....... Can you tell me if this a potential problem for the 20B in our aircraft use ?.......Also can you tell me if your 20B has the later reinforced housings ?......... -- Kelly Troyer ------=_NextPart_000_000F_01D0451A.83BECC10 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Marc.

What are the numbers that indicate = a later version?

Bill

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, February = 10, 2015 9:56 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = 20B Engines

 

There are 3 = series of 20B engines IIRC. The center housing and the crank on some of the = earlier versions was reported to be a weak link……..later versions = had mods to some internal parts. I have a later version of the 20B. You can tell from the = rotor housing engine numbers (where the 20B is in black = surround).

Marc

 <= /o:p>

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, February = 06, 2015 4:17 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = 20B Engines

 

Thanks Mark........That is the info I was looking = for............I happen to have a 13B Cosmo that has the later = housings

and I had only read about the reinforced = housings.........

 

Kelly

 

On Fri, Feb 6, 2015 at 6:49 AM, Mark Steitle <flyrotary@lancaironline.net> wrote:

Kelly, =

I wouldn't = hesitate to use an early 20b.  The early 20b housings are plenty robust enough = for a/c use.  The beefier irons could be an issue if you're building a = turbo race engine due to the higher loads imposed during up shifting and down shifting.  We don't experience any of those loads.  =

I'm pretty = certain that my 20b is an early model and I have not experienced any issues with = irons cracking around the dowels.  The weakest area is along the inner = walls of the o-ring grooves nearest the water jackets. If your o-rings aren't to = factory specs, you run the risk of cracking an o-ring wall which ruins the housing.  Been there, done that.  If you treat the engine with = the same care you would a certified a/c engine, then you won't have any = trouble with longevity.

Mark

 

On Fri, Feb 6, 2015 at 12:00 AM, Kelly Troyer <flyrotary@lancaironline.net> wrote:

 Mark Steitle or other 20B = Drivers,

 

     I am looking at a 20B that looks to be an = early one before they added additional

metal in the dowel/oil passage area of the iron housings because = of some that I have

read developed cracks in this area in service in the autos I = presume.......

 

     Can you tell me if this a potential problem = for the 20B in our aircraft use ?.......Also

can you tell me if your 20B has the later reinforced housings ?.........  

 <= /p>

-- =

Kelly Troyer

 



 

 

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