X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3024031 for flyrotary@lancaironline.net; Sun, 13 Jul 2008 11:30:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta06.mail.rr.com with ESMTP id <20080713153001.KVZ4229.cdptpa-omta06.mail.rr.com@computername> for ; Sun, 13 Jul 2008 15:30:01 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] pre-mix; great trip Date: Sun, 13 Jul 2008 11:30:25 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C8E4DB.D8A1C3F0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: Acjk920wtK5AHB3SRXmpOgAYSSVTqgABU6Jg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 Message-Id: <20080713153001.KVZ4229.cdptpa-omta06.mail.rr.com@computername> This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C8E4DB.D8A1C3F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable A great flight, Al and sounds like every thing is doing great. Nice = cruise speed for the fuel consumption for sure. =20 When I had a 2.17:1 gear box, I also noticed that I was =93making Oil=94 = in the sump and would have to drain a bit ever so many hours. I was using a = mix of 1 oz/gallon. When I went to =BE Oz gallon of 2 cycle oil, the oil accumulation ceased. =20 I appear to =93consume=94 a bit more oil now that I am using the 2.85 = gear box (higher engine rpm) and have not notice any accumulation at 1 oz/gallon. Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html _____ =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Sunday, July 13, 2008 11:48 AM To: Rotary motors in aircraft Subject: [FlyRotary] pre-mix; great trip =20 Just returned from about 2500 nm trip. Engine ran great, including = flying over the Rockies west of Denver where I was briefly at about 14,000 ft = with density altitude of 16,500, and still had some throttle to go. Generally cruising at 165 KTAS, 9.2 =96 9.5 gph, about 5600 rpm. Not bad for a = 4-place airplane. =20 OK, now for some technical stuff. You may recall I converted my 20B = over from pan oil injection to using premix. =20 The main issue is the amount of 2-cycle oil that is ending up in the oil pan. When mixing 1 oz/gal I found the pan oil level had gone up by = about 1 =BD quarts (from 6 =BD to 8) in about 15 hours of flying; and my nice clear-amber 15-50 synthetic had become the dark blue-black color of the SuperTech 2-cycle oil. Doing the math suggests that about 1/3 of the = pre-mix oil is ending up in the pan. That seems way out of line, and although a suspect it is not harmful to the engine, I don=92t think it the best = lube for the re-drive. I changed the oil and reduced the amount of pre-mix to = =BE oz per gallon. I=92ll be surprised if there isn=92t still some 2-cycle oil = going into the pan. =20 So. . ; suggestions? Use different brand 2-cycle? Further reduce = pre-mix amount? =20 I=92m wondering if the fact that my cruise coolant temp is now running = around 150F would result in more of the pre-mix to condense out than if it was running at maybe 180F. =20 Another thing I notice is a small amount of fuel is coming out of the = fuel vent. The only explanation I can come up with is foaming/bubbles = forming in the return line after the pressure regulator. This goes into the = 3-gallon sump tank and up the =BC=94 vent line. This may have been occurring = previously, and the fuel evaporated as it went back along the surface; but now the = blue 2-cycle oil is left behind to be quite visible at the back of the cowl; = but I suspect the pre-mix is exacerbating the foaming.=20 =20 I notice the plugs have less carbon than before, and the inside of the exhaust exit is now very light grey. =20 Al __________ Information from ESET NOD32 Antivirus, version of virus = signature database 3263 (20080711) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_0009_01C8E4DB.D8A1C3F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

A great flight, Al and sounds like = every thing is doing great.=A0 Nice cruise speed for the fuel consumption for = sure.

 

When I had a 2.17:1 gear box, I = also noticed that I was “making Oil” in the sump and would have = to drain a bit ever so many hours.=A0=A0 I was using a mix of 1 oz/gallon.=A0 = When I went to =BE Oz gallon of 2 cycle oil, the oil accumulation = ceased.

 

I appear to “consume” a = bit more oil now that I am using the 2.85 gear box (higher engine rpm) and = have not notice any accumulation at 1 oz/gallon.

Ed Anderson

Rv-6A N494BW Rotary = Powered

Matthews, NC

eanderson@carolina.rr.com=

http://www.andersonee.com

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.dmack.net/mazda/index.html<= font size=3D2 face=3DArial>

From: = Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On Behalf Of Al = Gietzen
Sent: Sunday, July 13, = 2008 11:48 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] = pre-mix; great trip

 

Just returned from about 2500 nm = trip. Engine ran great, including flying over the Rockies west of Denver where I was briefly at about = 14,000 ft with density altitude of 16,500, and still had some throttle to go. = Generally cruising at 165 KTAS, 9.2 – 9.5 gph, about 5600 rpm. Not bad for a 4-place airplane.

 

OK, now for some technical = stuff.  You may recall I converted my 20B over from pan oil injection to using = premix.

 

The main issue is the amount of = 2-cycle oil that is ending up in the oil pan.  When mixing 1 oz/gal I found the  pan oil level had gone up by about 1 =BD quarts (from 6 =BD to 8) = in about 15 hours of flying; and my nice clear-amber 15-50 synthetic had become the = dark blue-black color of the SuperTech 2-cycle oil. Doing the math suggests = that about 1/3 of the pre-mix oil is ending up in the pan.  That seems = way out of line, and although a suspect it is not harmful to the engine, I = don’t think it the best lube for the re-drive.  I changed the oil and = reduced the amount of pre-mix to =BE oz per gallon.  I’ll be = surprised if there isn’t still some 2-cycle oil going into the = pan.

 

So. . ; suggestions?  Use = different brand 2-cycle?  Further reduce pre-mix = amount?

 

I’m wondering if the fact = that my cruise coolant temp is now running around 150F would result in more of = the pre-mix to condense out than if it was running at maybe = 180F.

 

Another thing I notice is a small = amount of fuel is coming out of the fuel vent.  The only explanation I can = come up with is foaming/bubbles forming in the return line after the pressure regulator.  This goes into the 3-gallon sump tank and up the = =BC” vent line.  This may have been occurring previously, and the fuel = evaporated as it went back along the surface; but now the blue 2-cycle oil is left = behind to be quite visible at the back of the cowl; but I suspect the pre-mix is exacerbating the foaming.

 

I notice the plugs have less = carbon than before, and the inside of the exhaust exit is now very light = grey.

 

Al



__________ Information from ESET NOD32 Antivirus, version of virus = signature database 3263 (20080711) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

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