X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mailout2.pacific.net.au ([61.8.0.85] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 919042 for flyrotary@lancaironline.net; Fri, 29 Apr 2005 08:41:34 -0400 Received-SPF: none receiver=logan.com; client-ip=61.8.0.85; envelope-from=peon@pacific.net.au Received: from mailproxy1.pacific.net.au (mailproxy1.pacific.net.au [61.8.0.86]) by mailout2.pacific.net.au (8.12.3/8.12.3/Debian-7.1) with ESMTP id j3TCekml024273 for ; Fri, 29 Apr 2005 22:40:46 +1000 Received: from ar1 (ppp27AA.dyn.pacific.net.au [61.8.39.170]) by mailproxy1.pacific.net.au (8.12.3/8.12.3/Debian-7.1) with SMTP id j3TCehIn023342 for ; Fri, 29 Apr 2005 22:40:44 +1000 Message-ID: <002501c54cb7$8f8b62d0$aa27083d@ar1> From: "Leon" To: "Rotary motors in aircraft" References: Subject: Why I use pre-mix in race cars was Re: [FlyRotary] Re: Re : oil injection pump Date: Fri, 29 Apr 2005 22:32:50 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0022_01C54D0B.604DAF10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C54D0B.604DAF10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Ian, The reason is VERY simple. The amount of oil injected is sort of = proportional to the mean speed of the engine. As the race engines spend = most of their time between 7,500 & 9,500 RPM, there is a propensity for = the metering pump to empty the sump rather rapidly, which can cause oil = surge in a long race. Not a condition I wish to contemplate. So I use premix, but NOT a lot, and NOT a synthetic 2 stroke oil = either. We run around 250 -275:1 I just hate it when the oil fouls the = racing plugs on a cold day. Additionally, we are using FMR (Factory = Mazda Race) 3 mm carbon alloy apex seals, which have a certain amount = of self lubricity themselves, so I can get away with less oil. As long = as there is enough oil to transfer the heat from the seals themselves to = the rotor, then that is sufficient. As with many things, like = sealants, food, booze etc, more than enough is often TOO much (air = filters aside(}:>). Cheers, Leon ----- Original Message -----=20 From: Ian Beadle=20 To: Rotary motors in aircraft=20 Sent: Friday, April 29, 2005 7:26 PM Subject: [FlyRotary] Re: Re : oil injection pump SNIP>> Leon why do you use premix in your race car? Ian Beadle W. Australia ------=_NextPart_000_0022_01C54D0B.604DAF10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Ian,
 
The reason is VERY simple.  The = amount of oil=20 injected is sort of proportional to the mean speed of the engine.  = As the=20 race engines spend most of their time between 7,500 & 9,500 = RPM,  there=20 is a propensity for the metering pump to empty the sump rather=20 rapidly,  which can cause oil surge in a long race.  Not a = condition I=20 wish to contemplate.
 
So I use premix,  but NOT a = lot,  and NOT=20 a synthetic 2 stroke oil either.  We run around 250 -275:1 I just = hate it=20 when the oil fouls the racing plugs on a cold day.  = Additionally,  we=20 are using FMR (Factory Mazda Race) 3 mm carbon alloy apex seals,  = which=20 have a certain amount of self lubricity themselves,  so I can get = away with=20 less oil.  As long as there is enough oil to transfer the heat from = the=20 seals themselves to the rotor,  then that is sufficient.  As = with many=20 things, like sealants,  food,  booze etc, more than = enough is=20 often TOO much (air filters aside(}:>).
 
Cheers,
 
Leon
----- Original Message -----
From:=20 Ian = Beadle=20
Sent: Friday, April 29, 2005 = 7:26=20 PM
Subject: [FlyRotary] Re: Re : = oil=20 injection pump

SNIP>>
Leon why do you use premix in your = race=20 car?
 
Ian Beadle  W. = Australia
 
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