REFLECTOR: Oil Type

Douglas Holub douglas.holub at gmail.com
Tue Jul 28 09:37:16 CDT 2009


ECI recommends 200 F (96 C) oil temperature in cruise for their engines. I 
think the heat keeps crap from building up internally, and gets rid of any 
water in the case.

Doug Holub
----- Original Message ----- 
From: <aminetech at bluefrog.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Tuesday, July 28, 2009 9:01 AM
Subject: Re: REFLECTOR: Oil Type


> Thanks,
>
> My oil temp peaked at 113 C while flying in the South, 92 C flying NY-OSH. 
> I'm looking at a second cooler, a 2 pass stewart warner here at OSH.  They 
> say it will cool 20% more.  The oil vendor told me that the multi grade 
> had a higher viscosity at high oil temps.  I'll question him some more on 
> that.
>
> John
>
> --- tomcat05 at comcast.net wrote:
>
> From: Tom <tomcat05 at comcast.net>
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Oil Type
> Date: Mon, 27 Jul 2009 15:52:43 -0400
>
> How hot is your oil?? Have you gone the 2nd cooler route? Anyhow, multi
> vis is a mistake at high temps (unless it is a synthetic which you can't
> really use with leaded fuels). The base oil in multi wt is the lower
> number, as it wears the high vis (top number) decreases. If you live in
> a warm climate there is very little benefit to multi wgts as cold starts
> are their best feature. Going to 120 (60 wght) is possible but if you're
> uncomfortable with your oil temps don't give up on trying to fix.
> My plane has updraft cooling, had only one cooler and very small cooling
> inlets when I first got it. I played with various things for several
> weeks to get the oil temps down. I wound up getting a 5 row stewart
> warner as a 2nd cooler and was able to place it on the top baffling.
> Initially I blasted air to it with a 3 inch duct shared off of induction
> air via a Y. While later working on hot CHTs I found that the ducting
> wasn't necessary as there was plenty of air flow through the cooler (hi
> pressure/low pressure on opposite sides of the baffling). I went from
> 235+ down to 185 with this setup. The Lycoming gurus say that the engine
> wasn't set up to pump oil through 30 feet of rigid line. Probably why we
> don't get much heat out of it either when it's cold. Tom
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