X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 09 Jun 2007 23:33:47 -0400 Message-ID: X-Original-Return-Path: Received: from an-out-0708.google.com ([209.85.132.243] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2094102 for lml@lancaironline.net; Sat, 09 Jun 2007 22:37:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.132.243; envelope-from=msteitle@gmail.com Received: by an-out-0708.google.com with SMTP id b2so237393ana for ; Sat, 09 Jun 2007 19:36:49 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=PD6sP6iP09WGhabf1JhFkFtx7dStbf9gC94IQ1gp2ZnMyNenNbfhe1plRWaYfeSY1dkwHNxpkz/ZL8h6uc50uqZp/O8Djne5y3lur78fl3jo2eiWiKFkRTycmg/ouKdhwWTSVwVZhnY/w+UmjZt0J1Mxv8dSRa4drDRI7eUfZE4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=tfi5noDMwfcFuQ5IfBeew63S10HYeFnWxwP6grUrK/8IaLgjm9sNuiW2k1DWwd1k7N09bbQxc8ToBZPftz5RARsfvH8SR+iYQ96Bq3yBWA852G0BWij8pplHFOSS3+yR0CgEWc9RfllckDr3eKf7Q292qazveP5hYzhUv6BUBd4= Received: by 10.100.199.12 with SMTP id w12mr601408anf.1181443009201; Sat, 09 Jun 2007 19:36:49 -0700 (PDT) Received: by 10.100.38.20 with HTTP; Sat, 9 Jun 2007 19:36:49 -0700 (PDT) X-Original-Message-ID: <5cf132c0706091936x800c5fdr880fb5b5f05a28e1@mail.gmail.com> X-Original-Date: Sat, 9 Jun 2007 21:36:49 -0500 From: "Mark Steitle" X-Original-To: "Lancair Mailing List" Subject: Re: [LML] Re: What's better than a Continental IO-550 fuel system? X-Original-Cc: "Rotary motors in aircraft" In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_86985_20031933.1181443009140" References: ------=_Part_86985_20031933.1181443009140 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Good info Marv. Thanks for running this test for the group. I will pass it on to the rotary group if you don't mind. Thanks, Mark S. On 6/9/07, marv@lancair.net wrote: > > Posted for "Mark Steitle" : > > Mike, > > What do the snowmobile guys do about the oil in the gas issue? I would > guess that they have injection pumps, so it probably isn't an issue. My > efi > system returns a significant amount of fuel to the tank it is drawing > from. > I believe that running the electric fuel pump for 30 seconds to a minute > before starting on a cold morning, or after sitting for long periods, > would > provide adequate mixing. I haven't heard of any of the RX-8 Mazda's having > any problem with this, but then they draw their oil from the engine sump. > I > didn't want to do that because regular engine oil doesn't burn as cleanly > as > 2-stroke oil does. Also, I wanted to run Mobil 1 synthetic and that leaves > a gummy residue if injected and that will gum up the seals. This would > require a teardown. So, pre-mix it is. > > It rarely gets below 40* in Texas. ;-) > > Mark S. > > > [Data points.... about 10 hours have passed now and the 10dF gas/oil > solution is still just that... it exhibits no stratification of any sort. > The other bottle that started out stratified is almost completely diffused, > ambient temp (hi 80's), about 5hours later. Initial (and guarded) > conclusions... first, mixing 2-stroke oil with gasoline creates a solution > which doesn't precipitate out at (typically encountered) below-freezing > temperatures, and second, failure to agitate the mixture has no effect on > the components' tendencies toward creating a solution on their own through > normal diffusion, given enough time. Personally, I'm not surprised. The > air we breathe is a solution and the only time we see any of its components > separate themselves out is when the temperature and humidity levels reach > the point where water vapor removes itself via precipitation. It could be > that we might be able to force the oil to precipitate out of the gas/oil > mixture if we lower the temperature far enough, but I'm not willing to do a > test using dry ice to get the mixture down into the -60 or -70 range. Sorry > about that . Besides, if it's -60 outside not only am I not going > flying, I'm not leaving the house nor my electric blankie. ] > > > > -- > > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html > > ------=_Part_86985_20031933.1181443009140 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Good info Marv.  Thanks for running this test for the group. = ; I will pass it on to the rotary group if you don't mind. 
 
Thanks,
Mark S.

 
On 6/9/07, <= a href=3D"mailto:marv@lancair.net">marv@lancair.net <marv@lancair.net> wrote:
Post= ed for "Mark Steitle" <m= steitle@gmail.com >:

Mike,

What do the snowmobi= le guys do about the oil in the gas issue? I would
guess that they have = injection pumps, so it probably isn't an issue. My efi
system return= s a significant amount of fuel to the tank it is drawing from.
I believe that running the electric fuel pump for 30 seconds to a minut= e
before starting on a cold morning, or after sitting for long periods, = would
provide adequate mixing. I haven't heard of any of the RX-8 Ma= zda's having
any problem with this, but then they draw their oil from the engine sum= p. I
didn't want to do that because regular engine oil doesn't b= urn as cleanly as
2-stroke oil does. Also, I wanted to run Mobil 1 synth= etic and that leaves
a gummy residue if injected and that will gum up the seals. This would<= br>require a teardown. So, pre-mix it is.

It rarely gets below 40* i= n Texas. ;-)

Mark S.


[Data points.... about 10 hou= rs have passed now and the 10dF gas/oil solution is still just that... it e= xhibits no stratification of any sort.   The other bottle that st= arted out stratified is almost completely diffused, ambient temp (hi 80'= ;s), about 5hours later.  Initial (and guarded) conclusions... first, = mixing 2-stroke oil with gasoline creates a solution which doesn't prec= ipitate out at (typically encountered) below-freezing temperatures, and sec= ond, failure to agitate the mixture has no effect on the components' te= ndencies toward creating a solution on their own through normal diffusion, = given enough time.  Personally, I'm not surprised.  The air w= e breathe is a solution and the only time we see any of its components sepa= rate themselves out is when the temperature and humidity levels reach the p= oint where water vapor removes itself via precipitation.  It could be = that we might be able to force the oil to precipitate out of the gas/oil mi= xture if we lower the temperature far enough, but I'm not willing to do= a test using dry ice to get the mixture down into the -60 or -70 range.&nb= sp; Sorry about that <g>.   Besides, if it's -60 outsid= e not only am I not going flying, I'm not leaving the house nor my elec= tric blankie.  <Marv>   ]

 

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