X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from exhub003-1.exch003intermedia.net ([207.5.74.28] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with ESMTPS id 3987766 for flyrotary@lancaironline.net; Tue, 24 Nov 2009 08:50:36 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.28; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by exhub003-1.exch003intermedia.net ([207.5.74.28]) with mapi; Tue, 24 Nov 2009 05:49:59 -0800 From: Jeff Whaley To: Rotary motors in aircraft Date: Tue, 24 Nov 2009 05:52:14 -0800 Subject: RE: [FlyRotary] Re: No start Thread-Topic: [FlyRotary] Re: No start Thread-Index: AcpshdE7H7xpoE2zRr+ddPMK90l7DAAhpNOw Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E0153A41BCBC7EXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E0153A41BCBC7EXVMBX0035e_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm curious about the engine mount style you guys are using with this volta= ge drop situation. I can't imagine this problem occurring with the bed-mount/aluminum plate be= tween the oil pan and engine block configuration. Surely a 3/8" or =BD" plate of aluminum and 20 bolts will conduct from hous= ing to housing? - unless maybe it was anodized? Jeff From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Mark Steitle Sent: Monday, November 23, 2009 4:41 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: No start Steve, Glad you got things figured out (we were running out of suggestions). Sure= gives one a good feeling after battling a problem for so long. BTW, I hav= e two grounds on my engine. One is to the front cover, one to the front si= de housing. I'll check into moving one up to the starter. Mark On Mon, Nov 23, 2009 at 3:33 PM, Steve Brooks > wrote: Al & Mark, I would say that many people may have their ground to the engine block. Min= e has been that way since I built the plane, and worked fine for three or f= our years before I started having an issue. I had to order a couple of new crimp connectors, so that I can make a longe= r ground cable. Hopefully they will arrive before Thanksgiving, so that I c= an get it all hooked up over the long weekend. Steve Brooks Al Gietzen wrote: Steve, I read your other post on what you discovered regarding your bad ground. I = wonder how many of us have our engine grounds tied to a bolt near the front= cover or end housing? (Mine does...) Mark S. Mine does as well - bolts to the front cover. I have never had a starting i= ssue, but I have followed this discussion with interest because a couple of= years ago I did a starting spark check and found the sparks considerably w= eaker than the mode 8 (or whatever) check. I just assumed it was due to the= voltage drawdown when the starter was running. Now it's worth another look= . I recall giving it some thought when doing the wiring (My EC/EM manuals app= arently predated Tracy recommended wiring diagram). I concluded that the va= rious things bolted to the engine, like the manifolds, would provide good c= onduction paths regardless of the sealing between layers - and the 20B has = a couple more layers. Both my intake and exhaust flanges are continuous and= connect all the layers, and there are other things making the connection t= o the front cover, so this would be less of an issue compared to an install= ation having separate flanges to each housing. Anyway, Steve; I'm glad you found the problem. And thanks; it's a help to t= he rotary community, and again proves the value of a list such as this. Al G -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.= html --_000_C03ABB0A7362B84BB53D544B3C305E0E0153A41BCBC7EXVMBX0035e_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I’m curious about the engine mount style you guys are using with this voltage drop situation.

I can’t imagine this problem occurring with the bed-mount/aluminum plate between the oil pan and engine block configuration= .

Surely a 3/8” or =BD” plate of aluminum and 20 b= olts will conduct from housing to housing?=A0 - unless maybe it was anodized?

Jeff

 

From: Rotary motors= in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Stei= tle
Sent: Monday, November 23, 2009 4:41 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: No start

 

Steve,

 

Glad you got things figured out (we were running = out of suggestions).  Sure gives one a good feeling after battling a problem for so long.  BTW, I have two grounds on my engine.  One = is to the front cover, one to the front side housing.  I'll check in= to moving one up to the starter.

Mark

On Mon, Nov 23, 2009 at 3:33 PM, Steve Brooks <cozy4pilot@gmail.com> wrote:

Al & Mark,
I would say that many people may have their ground to the engine block. Min= e has been that way since I built the plane, and worked fine for three or fou= r years before I started having an issue.

I had to order a couple of new crimp connectors, so that I can make a longe= r ground cable. Hopefully they will arrive before Thanksgiving, so that I can= get it all hooked up over the long weekend.

Steve Brooks


Al Gietzen wrote:


Steve,

I read your other post on what you discovered regarding your bad ground. I wonder how many of us have our engine grounds tied to a bolt near the front cover or end housing? (Mine does...)

Mark S.

Mine does as well – bolts to the front cover. I have never had a star= ting issue, but I have followed this discussion with interest because a couple o= f years ago I did a starting spark check and found the sparks considerably we= aker than the mode 8 (or whatever) check. I just assumed it was due to the volta= ge drawdown when the starter was running. Now it’s worth another look.
I recall giving it some thought when doing the wiring (My EC/EM manuals apparently predated Tracy recommended wiring diagram). I concluded that the various things bolted to the engine, like the manifolds, would provide good conduction paths regardless of the sealing between layers – and the 2= 0B has a couple more layers. Both my intake and exhaust flanges are continuous= and connect all the layers, and there are other things making the connection to= the front cover, so this would be less of an issue compared to an installation having separate flanges to each housing.

Anyway, Steve; I’m glad you found the problem. And thanks; it’s= a help to the rotary community, and again proves the value of a list such as this.

Al G



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