X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m14.mx.aol.com ([64.12.138.204] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2403175 for flyrotary@lancaironline.net; Tue, 23 Oct 2007 19:35:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.204; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m14.mx.aol.com (mail_out_v38_r9.3.) id q.c95.19e74788 (39952) for ; Tue, 23 Oct 2007 19:34:39 -0400 (EDT) From: Lehanover@aol.com Message-ID: Date: Tue, 23 Oct 2007 19:34:38 EDT Subject: Re: [FlyRotary] Fuel delivery at WOT To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1193182478" X-Mailer: 9.0 Security Edition for Windows sub 5378 X-Spam-Flag: NO -------------------------------1193182478 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en =20 In a message dated 10/23/2007 6:35:54 P.M. Eastern Daylight Time, =20 bbradburry@bellsouth.net writes: Apparently I am not getting enough fuel flow to support high rpm. I have=20 not done the self tuning at high rpm yet, but I would not expect that the f= uel=20 flow would be so low as to limit the rpm. =20 What suggestions do you have? My ability to self tune has been limited due= =20 to cooling issues=E2=80=A6especially at WOT!=20 Lynn, it is too early to be sure yet, but your idea for the pressure bottle= =20 looks like it is going to help the cooling a lot. It may not be the comple= te=20 solution, but it seems to be a step in the right direction. Thanks!=20 Bill B =20 The rotary can run over-lean or over-rich happily. (sounds good and strong =20 both ways, and doesn't miss). Over rich can be right up to black smoke pouring out of the exhaust. It =20 shows as very low EGTs and water temps. I have been unable to make one shut=20= down =20 from being too rich. =20 Over-lean sounds a bit more crisp, has much less power, just slightly low =20 coolant temps and EGTs slightly low than normal. If leaned too far (ignition= =20 system will no longer light the mixture) the engine will shut off sharply, a= nd =20 will spool to a stop even at full throttle. But that is way lean of peak EGT= . =20 This is the case with peripheral exhaust ports. I don't know how the new sid= e=20 exhaust port runs when over lean. =20 Sudden over heating at full throttle, is usually air in the system that has=20= =20 stopped the pump or a lack of coolant in one location. So, the pressure bott= le=20 works great for eliminating that. =20 A long steady climb to overheating, shows you an undersized (under =20 performing) cooling system. Needs better sealing around coolers. Bigger cool= ers. More=20 airflow. =20 EGTs are controlled by running just slightly rich of best power, or 50 to=20 100 degrees rich of peak EGT or below 1650 continuous for carbon seals, may= be=20 1700 for steel seals and it makes no difference for ceramic seals. Once at=20 cruise, depending on how fast you want to go, you can lean well past peak E= GT to=20 get the EGT back down. Even 100 to 150 degrees below peak, or more with=20 tight plug gaps and a good ignition system. =20 =20 Lynn E. Hanover ************************************** See what's new at http://www.aol.com -------------------------------1193182478 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 10/23/2007 6:35:54 P.M. Eastern Daylight Time,=20 bbradburry@bellsouth.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000080 size= =3D2>

Apparently I am= not=20 getting enough fuel flow to support high rpm.  I have not done the se= lf=20 tuning at high rpm yet, but I would not expect that the fuel flow would be= so=20 low as to limit the rpm. 

 

What suggestion= s do=20 you have?  My ability to self tune has been limited due to cooling=20 issues=E2=80=A6especially at WOT!

 

Lynn, it is too ear= ly to=20 be sure yet, but your idea for the pressure bottle looks like it is going=20= to=20 help the cooling a lot.  It may not be the complete solution, but it=20 seems to be a step in the right direction. =20 Thanks!

 

 

Bill B=20

The rotary can run over-lean or over-rich happily. (sounds good and str= ong=20 both ways, and doesn't miss).
Over rich can be right up to black smoke pouring out of the exhaust. It= =20 shows as very low EGTs and water temps. I have been unable to make one shut=20= down=20 from being too rich.
 
Over-lean sounds a bit more crisp, has much less power, just slightly l= ow=20 coolant temps and EGTs slightly low than normal. If leaned too far (ignition= =20 system will no longer light the mixture) the engine will shut off sharply, a= nd=20 will spool to a stop even at full throttle. But that is way lean of peak EGT= .=20 This is the case with peripheral exhaust ports. I don't know how the new sid= e=20 exhaust port runs when over lean.
 
Sudden over heating at full throttle, is usually air in the system that= has=20 stopped the pump or a lack of coolant in one location. So, the pressure bott= le=20 works great for eliminating that.
 
A long steady climb to overheating, shows you an undersized (under=20 performing) cooling system. Needs better sealing around coolers. Bigger cool= ers.=20 More airflow.
 
EGTs are controlled by running just slightly rich of best power, or=20 50 to 100 degrees rich of peak EGT or below 1650 continuous for carbon=20 seals, maybe 1700 for steel seals and it makes no difference for cerami= c=20 seals. Once at cruise, depending on how fast you want to go, you can lean we= ll=20 past peak EGT to get the EGT back down. Even 100 to 150 degrees below peak,=20= or=20 more with tight plug gaps and a good ignition system.  
 
Lynn E. Hanover



See w= hat's new at AOL.c= om and Make AOL Your Homepage.
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