REFLECTOR: Hot oil

[Scott Derrick]

Bob,

I think you may be right. I'm going to go over the fuel pressure and 
mixture settings again.  I'm using a 520e book to setup the fuel flow. 
Its problematic since my engine was originally a 520ce,  but is now sans 
turbo.

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Hot oil
From: Bob Jackson (Jax Tech) <bobj at jaxtechllc.com>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Date: 07/03/2011 12:17 PM

> Scott,
>
> It sounds to me like your WOT fuel flow may be too low.  Ours (custom turbo
> IO-550N) is a different engine, I know but our EGTs range from 1375 to 1425
> at take-off power (31" MAP and 2700 RPM) with the fuel flow at the standard
> IO-550N 29 gph.
>
> Once we get to 1000 AGL and start our sustained climb to altitude (>10 Kft)
> we leave the power at WOT, but increase the fuel flow to 34 gph, as is
> standard to keep the temps as low as possible during the turbonormalized
> climb out, and the EGTs stabilize between a low of ~1150 and a high of ~1300
> all the way up.  It's often 95 OAT in Florida, too, and our oil temp's will
> reach 210 even 220 by the time we reach 10 Kft, and two of the CHTs will be
> around 400 degrees, though most are below 360 degrees -- we're still working
> on CHT cooling, especially at altitudes above 10 Kft.
>
> Bob Jackson
> Custom turbo IO-550N
> N2XF 'heavy'
>
> PS  I forgot to mention that I think a lot of our problem is our weight,
> which will typically be 3000 lb single pilot with full (93 gal) fuel --
> that's a lotta lard to push up to those high altitudes!
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Tuesday, June 28, 2011 6:49 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: REFLECTOR: Hot oil
>
> I took off from Henderson(Las Vegas) this morning it was 95 degrees. By
> the time I rotated what with taxiing and waiting in line, the engine was
> pretty much hot.
>
> I climbed from 2500 ft to 5,000(clear of the surrounding dirt) and my
> oil temp was 230-240.  My Dynon has an irratting oil temp display that
> rapidly changes temps all the time. A smoothing function is needed o
> that sensor.
>
> Anyway I leveled off and pulled the power back to cool things off. The
> one thing I noticed immediately was the EGT's  were pretty high, high
> 1400's.  I would have expected 1200-1300's at full rich. This was the
> first time I've had this new engine at such a low altitude and I think I
> have the (idle) mixture or high pump pressure set to lean.
>
> I eventually gave up on it cooling down, climbed to 8500 and the temps
> started to drop, both egt's and oil temps.
>
> What temps do other big engines +500CI see on hot day climb outs..
>
> Scott
>
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-- 
A woman is like a tea bag- you never know how strong she is until she 
gets in hot water.
Eleanor Roosevelt