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 5.2.16) with ESMTPS id 3858889 for flyrotary@lancaironline.net; Fri, 18 Sep 2009 16:04:49 -0400 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; Fri, 18 Sep 2009 13:04:13 -0700 From: Jeff Whaley To: Rotary motors in aircraft Date: Fri, 18 Sep 2009 13:04:33 -0700 Subject: RE: [FlyRotary] Mixture condition Thread-Topic: [FlyRotary] Mixture condition Thread-Index: Aco4lKlzh2j7o+LLQt2diLZ4ZnjVegAA7pqA 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_C03ABB0A7362B84BB53D544B3C305E0E01536074D77EEXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E01536074D77EEXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable John, let's clarify your previous statement " I turned of the fuel pump and= with the injector switch's off the engine continued to run until the fuel = press was down to 17 pds. and quit." Do you really mean BOTH INJECTORS are= OFF and the engine keeps running? Does your system automatically switch to= carburetor if the fuel injection system is disabled or fails? Or do you ha= ve to take manual intervention to switch from one to the other? Your manifold pressure and EGT behavior are normal for a misfiring engine. I doubt there is anything wrong with the injectors. There was a lot of discussion about 2 months ago on primary and secondary i= njectors above and below staging point - you may want to review some of tha= t. However, if your EC2 is wired as per Tracy's recommendation it doesn't m= atter whether PRI, SEC or BOTH are on below staging - the DPDT switches tak= e care of that, but above staging BOTH should be ON. You also need to know= where your staging point is in terms of manifold pressure. Default is ~15"= ; I increased mine to 17" and some guys have set it to 20". Steve's comment about the pressure regulator may be the key ... Jeff From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of John Sent: Friday, September 18, 2009 3:14 PM To: Rotary motors in aircraft Subject: [FlyRotary] Mixture condition Jeff, I went back out and ran the engine again. The fuel pumps are T-eed= of after the gascolator and go to the separate fuel systems, the Weber is = on top of the engine, above the fuel level in tank. I ran the engine on fu= el injection and it was working fine when it was cool. I shut off the prim= ary injector switch and the engine quit immediately like it had always done= in the past, but when it go warm (190) and started missing, it ran a lot b= etter with the injector switch off and when I turned the injectors back on = it was missing terrible and this time I noticed that the Manifold pressure = creep up from 13# to 24# and the EGT on the #1 rotor went down to the botto= m of the scale. I tried the scene 3 times and the results were the same ea= ch time with the primary or secondary injector switches on. Like wise it i= s a big question to me, as to the change in function in the injector switch= es. Could it be that the computer is flooding the #2 rotor and the reason it do= esn't quit when I turn the mixture to full lean at 2000 rpm. It does run a= little better at higher rpm's (like 4000). The injectors were reconditioned ones that I got from Bruce T and I'm think= ing that the #1 primary injector may not be working when it gets hot. On t= he other hand, doesn't the secondary system take over, or is that only at h= igher rpm's. If it is a ground condition, it seems like it wouldn't wait until the engin= e is hot to quit working, it would be happening at any time. JohnD --_000_C03ABB0A7362B84BB53D544B3C305E0E01536074D77EEXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

John, let’s clarify your previous statement “ I turne= d of the fuel pump and with the injector switch's off the engine continued to ru= n until the fuel press was down to 17 pds. and quit.”  Do you really mean BOTH INJECTORS are OFF and the engine keeps running? Does y= our system automatically switch to carburetor if the fuel injection system is disabled or fails? Or do you have to take manual intervention to switch fro= m one to the other?

Your manifold pressure and EGT behavior are normal for a mis= firing engine.

I doubt there is anything wrong with the injectors.

There was a lot of discussion about 2 months ago on primary = and secondary injectors above and below staging point – you may want to review some of that. However, if your EC2 is wired as per Tracy’s recommendation it doesn’t matter whether PRI, SEC or BOTH are on belo= w staging – the DPDT switches take care of that, but above staging BOTH should be ON.  You also need to know where your staging point is in te= rms of manifold pressure. Default is ~15”; I increased mine to 17” = and some guys have set it to 20”.

Steve’s comment about the pressure regulator may be th= e key …

Jeff

 

From: Rotary motors= in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John
Sent: Friday, September 18, 2009 3:14 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Mixture condition

 

Jeff,   I went back out and ran the engine again.  The fuel pumps are T-eed of after the gascolator and go to the separate fuel systems, the Weber is on t= op of the engine, above the fuel level in tank.  I ran the engine on fuel injection and it was working fine when it was cool.  I shut off the primary injector switch and the engine quit immediately like it had always = done in the past, but when it go warm (190) and started missing, it ran a lot be= tter with the injector switch off and when I turned the injectors back on it was missing terrible and this time I noticed that the Manifold pressure creep u= p from 13# to 24# and the EGT on the #1 rotor went down to the bottom of the scale.  I tried the scene 3 times and the results were the same each t= ime with the primary or secondary injector switches on.  Like wise it= is a big question to me, as to the change in function in the injector switches. 

 

Could it be that the computer is flooding the #2 rotor and the reason it doesn't = quit when I turn the mixture to full lean at 2000 rpm.  It does run a littl= e better at higher rpm's (like 4000).  

 

The injectors were reconditioned ones that I got from Bruce T and I'm thinking = that the #1 primary injector may not be working when it gets hot.  On the o= ther hand, doesn't the secondary system take over, or is that only at higher rpm= 's.

 

If it is a ground condition, it seems like it wouldn't wait until the engine i= s hot to quit working, it would be happening at any time.  JohnD<= o:p>

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