X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-mb02.mx.aol.com ([64.12.207.163] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4382000 for flyrotary@lancaironline.net; Tue, 06 Jul 2010 04:39:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.207.163; envelope-from=Lehanover@aol.com Received: from imo-ma01.mx.aol.com (imo-ma01.mx.aol.com [64.12.78.136]) by imr-mb02.mx.aol.com (8.14.1/8.14.1) with ESMTP id o668d1s7022459 for ; Tue, 6 Jul 2010 04:39:01 -0400 Received: from Lehanover@aol.com by imo-ma01.mx.aol.com (mail_out_v42.9.) id q.e6b.36224ff (37043) for ; Tue, 6 Jul 2010 04:38:55 -0400 (EDT) Received: from smtprly-dd01.mx.aol.com (smtprly-dd01.mx.aol.com [205.188.84.129]) by cia-db03.mx.aol.com (v129.4) with ESMTP id MAILCIADB031-d3e94c32eb9e240; Tue, 06 Jul 2010 04:38:55 -0400 Received: from webmail-d093 (webmail-d093.sim.aol.com [205.188.255.4]) by smtprly-dd01.mx.aol.com (v129.4) with ESMTP id MAILSMTPRLYDD015-d3e94c32eb9e240; Tue, 06 Jul 2010 04:38:54 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] mixture Date: Tue, 06 Jul 2010 04:38:54 -0400 X-AOL-IP: 71.50.78.177 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: lehanover@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CCEAFDCD8C82AF_16C8_3950C_webmail-d093.sysops.aol.com" X-Mailer: AOL Webmail 32213-STANDARD Received: from 71.50.78.177 by webmail-d093.sysops.aol.com (205.188.255.4) with HTTP (WebMailUI); Tue, 06 Jul 2010 04:38:54 -0400 Message-Id: <8CCEAFDCD7E3A75-16C8-1EF32@webmail-d093.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com ----------MB_8CCEAFDCD8C82AF_16C8_3950C_webmail-d093.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" A heated air fuel meter will be able to read accurately down to low power= settings. A two wire, not so much. It goes in the down pipe after the col= lector and gives an average reading for all housings. This is what you loo= k at for mixture readings below wide open throttle cruise RPM mixtures.=20 For EGT readings (Exhaust Gas Temperatures) install a probe in each of the= three pipes 3 to 4 inches out from the flange face (all the same distance= ). They will not fit gas tight, but pressure this close to the engine is= below ambient, so a bit of air will leak into the exhaust flow if a leak= is present. The EGT gage gives you a good picture of mixture ratio at ful= l and near full throttle. At lower throttle settings EGT is worthless.=20 Add fuel until the max EGT is 1600 degrees or less, say 1550 to 1600. Just= a hair rich of best power. Makes apex seals last a long long time.=20 This will be in the 12s on the air/fuel gage. Looking at plug color in this age of unleaded fuel is of no value. Racers= used to do a clean cut going into the pits so the engine man could read= the plugs. Looking for light gray color on the intake valve side of the= porcelain. Yes we indexed plugs with a mark to show where the ground elec= trode was, and installed plugs that would have the ground away from the in= take valve when installed at rated torque. In any case, a clean cut was at= full throttle at peak power rpm. As you slow and turn in for the pits, yo= u downshift and squeeze on the brakes and throttle to hold max power for= a half second and cut the ignition. Slip into neutral. For lower powered= cars this is no problem because they cannot spin the tires. Not possible= on bigger engines, but you can do it on the straight and cut and coast in= to the pits.=20 The object is that the engine man wants to see the plugs as they appeared= at the power peak and full throttle. The EGT gage and fuel air gage did= away with the clean cut, and even reading the plugs.=20 The plug color he was looking for was from lead salts on the porcelain, an= d with unleaded fuel there is just a black color no matter the actual cond= ition of the burn.=20 If it gets to 4,000 RPM and stops one or more housings are out of fuel. Th= is is with a prop installed? The unequal length header pipes make each housing happy at a different RPM= . So you have three engines on one crank. This might help spread the power= band a bit but reduces peak power. You always end up with one housing doi= ng a bit better than another and that has one or two housings pulling on= the third. This will show up as an imbalance (vibration) that changes RPM= with tuning changes.=20 Most typical is lack of fuel. Lack of fuel pressure. Use a Carter sliding= vane 7 PSI street racer pump and start at 3 1/2 pounds of pressure.=20 It must hold that pressure at full throttle, peak power RPM. If you like= the Facet you can put two in series to get more pressure.=20 If there is a filter under a brass plug at the fuel inlet, discard this fi= lter. Use an in-line filter close to the carb.=20 Lynn E. Hanover =20 =20 =20 I have just started running my engine on a test stand. currently it will= only do 4000 rpm. I noticed the rear rotor exhaust has turned blue. I= pulled the plugs and the rear lead and trail plugs were very sooty. the= front rotor trailing plug was clean, lead was black. I suspect that my= trailing ignition for the front plug may not be running correctly. getti= ng started I have been running whatever jets that came with the carb. it= appears I need to change them, to smaller I assume. do I need to install= a mixture gauge? does it attach to the exhaust or intake? if so, which= pipe(s)? =20 the facet electric pump delivers the rated 30 gals/hr [at zero psi], but= my fuel pressure gauge only shows about 2 psi. is it possible that I hav= e fuel starvation above 4000 rpm? the specs say that the pump has a 4-8= psi range. not sure why I am seeing only 2 psi. even at idle. the fuel= lift is all of a few inches. I removed the fuel pressure regulator, but= no difference. =20 =20 KevinLane Carpentry =20 =20 =20 =20 -----Original Message----- From: kevin lane To: Rotary motors in aircraft Sent: Mon, Jul 5, 2010 8:19 pm Subject: [FlyRotary] mixture I have just started running my engine on a test stand. currently it will= only do 4000 rpm. I noticed the rear rotor exhaust has turned blue. I= pulled the plugs and the rear lead and trail plugs were very sooty. the= front rotor trailing plug was clean, lead was black. I suspect that my= trailing ignition for the front plug may not be running correctly. getti= ng started I have been running whatever jets that came with the carb. it= appears I need to change them, to smaller I assume. do I need to install= a mixture gauge? does it attach to the exhaust or intake? if so, which= pipe(s)? =20 the facet electric pump delivers the rated 30 gals/hr [at zero psi], but= my fuel pressure gauge only shows about 2 psi. is it possible that I hav= e fuel starvation above 4000 rpm? the specs say that the pump has a 4-8= psi range. not sure why I am seeing only 2 psi. even at idle. the fuel= lift is all of a few inches. I removed the fuel pressure regulator, but= no difference. =20 =20 KevinLane Carpentry www.KevinLaneCarpentry.com =20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html =20 ----------MB_8CCEAFDCD8C82AF_16C8_3950C_webmail-d093.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" A heated air fuel meter will be able to read accurat= ely down to low power settings. A two wire, not so much. It goes in the do= wn pipe after the collector and gives an average reading for all housings.= This is what you look at for mixture readings below wide open throttle cr= uise RPM mixtures.

For EGT readings (Exhaust Gas Temperatures) install a probe in each of the= three pipes 3 to 4 inches out from the flange face (all the same distance= ). They will not fit gas tight, but pressure this close to the engine is= below ambient, so a bit of air will leak into the exhaust flow if a leak= is present. The EGT gage gives you a good picture of mixture ratio at ful= l and near full throttle. At lower throttle settings EGT is worthless.
Add fuel until the max EGT is 1600 degrees or less, say 1550 to 1600. Just= a hair rich of best power. Makes apex seals last a long long time.

This will be in the 12s on the air/fuel gage.

Looking at plug color in this age of unleaded fuel is of no value. Racers= used to do a clean cut going into the pits so the engine man could read= the plugs. Looking for light gray color on the intake valve side of the= porcelain. Yes we indexed plugs with a mark to show where the ground elec= trode was, and installed plugs that would have the ground away from the in= take valve when installed at rated torque. In any case, a clean cut was at= full throttle at peak power rpm. As you slow and turn in for the pits, yo= u downshift and squeeze on the brakes and throttle to hold max power for= a half second and cut the ignition. Slip into neutral. For lower powered= cars this is no problem because they cannot spin the tires. Not possible= on bigger engines, but you can do it on the straight and cut and coast in= to the pits.

The object is that the engine man wants to see the plugs as they appeared= at the power peak and full throttle. The EGT gage and fuel air gage did= away with the clean cut, and even reading the plugs.

The plug color he was looking for was from lead salts on the porcelain, an= d with unleaded fuel there is just a black color no matter the actual cond= ition of the burn.

If it gets to 4,000 RPM and stops one or more housings are out of fuel. Th= is is with a prop installed?

The unequal length header pipes make each housing happy at a different RPM= . So you have three engines on one crank. This might help spread the power= band a bit but reduces peak power. You always end up with one housing doi= ng a bit better than another and that has one or two housings pulling on= the third. This will show up as an imbalance (vibration) that changes RPM= with tuning changes.

Most typical is lack of fuel. Lack of fuel pressure. Use a Carter sliding= vane 7 PSI street racer pump and start at 3 1/2 pounds of pressure.
It must hold that pressure at full throttle, peak power RPM. If you like= the Facet you can put two in series to get more pressure.


If there is a filter under a brass plug at the fuel inlet, discard this fi= lter. Use an in-line filter close to the carb.

Lynn E. Hanover 
 

I have just started running my engine on= a test=20 stand.  currently it will only do 4000 rpm.  I noticed the rear= rotor=20 exhaust has turned blue.  I pulled the plugs and the rear lead and tr= ail=20 plugs were very sooty.  the front rotor trailing plug was clean, lead= was=20 black.  I suspect that my trailing ignition for the front plug may no= t be=20 running correctly.  getting started I have been running whatever jets= that=20 came with the carb.  it appears I need to change them, to smaller I= =20 assume.  do I need to install a mixture gauge?  does it attach= to the=20 exhaust or intake?  if so, which pipe(s)?
 
the facet electric pump delivers the rat= ed 30=20 gals/hr [at zero psi], but my fuel pressure gauge only shows about 2 psi.&= nbsp;=20 is it possible that I have fuel starvation above 4000 rpm?  the specs= say=20 that the pump has a 4-8 psi range.  not sure why I am seeing only 2= psi.=20 even at idle.  the fuel lift is all of a few inches.  I removed= the=20 fuel pressure regulator, but no difference.
 
 
KevinLane Carpentry




I have just started running my engine on= a test=20 stand.  currently it will only do 4000 rpm.  I noticed the rear= rotor=20 exhaust has turned blue.  I pulled the plugs and the rear lead and tr= ail=20 plugs were very sooty.  the front rotor trailing plug was clean, lead= was=20 black.  I suspect that my trailing ignition for the front plug may no= t be=20 running correctly.  getting started I have been running whatever jets= that=20 came with the carb.  it appears I need to change them, to smaller I= =20 assume.  do I need to install a mixture gauge?  does it attach= to the=20 exhaust or intake?  if so, which pipe(s)?
 
the facet electric pump delivers the rat= ed 30=20 gals/hr [at zero psi], but my fuel pressure gauge only shows about 2 psi.&= nbsp;=20 is it possible that I have fuel starvation above 4000 rpm?  the specs= say=20 that the pump has a 4-8 psi range.  not sure why I am seeing only 2= psi.=20 even at idle.  the fuel lift is all of a few inches.  I removed= the=20 fuel pressure regulator, but no difference.
 
 
KevinLane Carpentry
www.KevinL= aneCarpentry.com

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