REFLECTOR:Lean of Peak

[Ronnie Brown]

You're right!  That is close to being next on my list of stuff to do.  There
is a write up on the GAMI web page at http://www.gami.com/gamileannew.html
on how to collect the data for seeing how well the injectors are matched.
Since my EIS has a RS232 Data port, I will use it to collect all this data
so I can analyze it at home.

Ronnie


----- Original Message -----
From: "Scott" <scott@tnstaafl.net>
To: <reflector@tvbf.org>
Sent: Sunday, September 14, 2003 9:30 AM
Subject: Re: REFLECTOR:INTAKE COMBUSTION AIR


| Ronnie,
|
| We gotta get you dialed into LOP operations....  Less gas, cooler running,
longer lasting.
|
| Scott
|
|
| On Sun, 14 Sep 2003 09:10:38 -0400, Ronnie Brown wrote:
| > We asked Duane about the open baffling on the cooling shrouds on
| > the factory XL Continental (shrouds don't wrap under the bottoms of
| > the cylinders). He said the angle valve Lycoming and Continentals
| > with their larger cooling fins don't need the tight shrouds.
| >
| > However, I did wrap the cylinders all the way to the bottom of my
| > IO 360 C1C - 200HP and only have about a 1.5 to 2" opening at the
| > bottom of my cylinders. My engine runs cool with the NACA down
| > draft cooling - 350 - 360 degrees while leaned out to 100 degrees
| > rich of peak. I have never seen 400 degrees on my heads, even on
| > 90 degree days and during a long climb out. Even taxiing at
| > Oshkosh only produced 300-320 degrees.
| >
| > And, I am only running one oil cooler. My A&P/IA friend says one
| > cooler and those long oil lines should be plenty of oil cooling IF
| > the engine is cooled adequately. After 85 hours of mostly summer
| > flying, I agree.
| >
| > I worried a lot about a hot running rear mounted engine while I was
| > building and watched the reflector and VV's for any information for
| > improving cooling. Now I am happy to say, this has been a non
| > issue for my Velocity. I LOVE IT!!!
| >
| > Ronnie
| >
| >
| > ----- Original Message -----
| > From: SlvEgl99@aol.com
| > To: reflector@tvbf.org
| > Sent: Sunday, September 14, 2003 8:18 AM
| > Subject: Re: REFLECTOR:INTAKE COMBUSTION AIR
| >
| >
| > I have an XL FG with Lycoming IO540, two oil coolers.
| >
| >
| > I have always had a bit of a cooling issue. Not so much that temps
| > are high, but that they are uneven between cylinders. The center
| > two (3&4) are significantly cooler than the end four. Thisa is
| > sometimes 70 degrees or more.
| >
| >
| > After a lot of time trying to get diverters in the ducting to move
| > a greater amount of air to the ends of the plenum, I took a hard
| > look at how Lycoming has the air flow controlled between the
| > cylinders and noted that they have baffles between the cylinders
| > that force the cooling air to stay within the cylinder fins nearly
| > to the bottom of the cylinder. On the other hand, the XL plenum
| > stops half way down the front and rear cylinders, allowing the air
| > to "escape" from the cylinder fins at this point.
| >
| >
| > I also took a look at a a long EZ and how that engine is baffled.
| > I saw that the baffling has the air confined to the cylinders with
| > just a small (2.5") opening for the air to exit the fins.
| >
| >
| > By coincidence just this week I decided to extend the ends of the
| > plenum to near the bottom of the cylinders, cutting them off at
| > the approximate length of the Lycoming baffles.
| >
| >
| > How does it work? I don't know yet as I have just completed the
| > job and have not had a chance to fly it yet.
| >
| >
| > The other heat issue I have is that the front oil cooler puts too
| > much heat into the nose., and then into the cockpit. I have a
| > piece of foam above the canard inside the hatch cover to block the
| > heat from the nose and insulated it as well as I can by adding
| > insulation around the body of the cooler and insulating the oil
| > lines. I point out that I have a FG, thus no nose gear door to
| > allow air into the nose. I have toyed with the idea of adding a
| > small vent to bring in cool air to this area.
| >
| >
| > Any thoughts or ideas or concerns?
| >
| >
| > Bob Wood
| > N658SE
| > XL FG Bob II
|
|
|
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