REFLECTOR: Intake Measurement

Don Johnston via Reflector reflector at tvbf.org
Fri Jan 9 09:50:43 CST 2015


That's the approach I took as well.


[image: Inline image 2]
[image: Inline image 1]



On Fri, Jan 9, 2015 at 8:15 AM, Douglas Holub via Reflector <
reflector at tvbf.org> wrote:

>   Since the top cowling comes so close to the top of the engine, I
> thought it would be a waste to build a separate cooling plenum, so I built
> the plenum baffles into the top cowling.  Then I built aluminum walls
> around the cylinders like you see on most air-cooled single engine
> installations, and put neoprene strips on the tops of the aluminum walls to
> seal against the top cowling.  The main reason I did this was so that when
> I removed the top cowling, I would be able to see the engine.   As the
> attached picture shows, I’ve got the air filter, mechanical fuel injection,
> and Plasma III coils all sitting on top of the engine block.  (I can’t find
> any pictures of the baffles in the top cowl.)
>
> Doug Holub
> 2000 Standard FG w/ electric nose lift
>
>  *From:* Rene Dugas via Reflector <reflector at tvbf.org>
> *Sent:* Thursday, January 08, 2015 11:57 PM
> *To:* paul barfknecht <ceraygun at inbox.com> ; Velocity Aircraft Owners and
> Builders list <reflector at tvbf.org>
> *Subject:* Re: REFLECTOR: Intake Measurement
>
>  I have no boots with about 3/16" gaps and no cooling issues.  I've
> considered it but worry about it tearing and falling on the exhaust with
> subsequent fire.  If I had a problem that would probably be my first
> attempt at a fix though.
>
> [image: image1.jpeg]
>
> Sent from Rene's iPad. A pleasure.  Go Apple.
>
>
> On Jan 8, 2015, at 1:35 PM, paul barfknecht via Reflector <
> reflector at tvbf.org> wrote:
>
>  My nacas extend about an inch into the engine compartment. My downdraft
> tunnels are installed by sliding over the nacas forward then pivoted down
> to attach (with all those beautiful screws) to the plenum. The tube over
> tube fit is a smidge less than snug at the firewall. If I am getting
> movement of the engine relative to the firewall there is the allowance.
> Clearance between the downdraft tunnels and the cowling is about a quarter
> inch as I recall.
>
>
>  -----Original Message-----
> *From:* ajlz72756 at yahoo.com
> *Sent:* Thu, 8 Jan 2015 09:50:00 -0600
> *To:* ceraygun at inbox.com, tmann at n200lz.com, reflector at tvbf.org
> *Subject:* Re: REFLECTOR: Intake Measurement
>
>   Beautiful workmanship, my question is, I keep seeing all of these
> photo’s of the down draft cooling plenums, without any rubber booted
> connection between the engine and the NACA scoop connection at the
> firewall. I have seen photo’s of the plenums with a rubber boot installed.
> So for those that I am seeing without, I know that my 300hp IO540 engine,
> using the standard MT three blade prop, is torqueing against the engine
> mount, at least 3/8 inch at full power, I know this because of the size
> holes I have had to cut around my exhaust pipes to keep them from hitting
> my cowling. My exhaust Exit holes started out with a 1/4 inch clearance all
> the way around, and I had to keep enlarging them, they are now oblong,  in
> the direction that the engine is twisting. It also seems to me that without
> some sort of rubber booted connection, that the engine vibration alone,
> would rip the connection off of the firewall.
>
> My thoughts, others using the NACA down draft cooling will have to weigh
> in on this issue.
>
> -----------------------------------------
> Andrew Ellzey
> N151AJ IO540 300hp armpit updraft cooling
>
>   *From:* paul barfknecht via Reflector <reflector at tvbf.org>
> *Sent:* Wednesday, January 07, 2015 4:42 PM
> *To:* Thomas Mann <tmann at n200lz.com> ; Velocity Aircraft Owners and
> Builders list <reflector at tvbf.org> ; Velocity Reflector
> <reflector at tvbf.org>
> *Subject:* Re: REFLECTOR: Intake Measurement
>
>  I don't have the measurement, but thought you might be interested in a
> photo of my plenum on an SUV with an io360.  Ken Mishler , a Velocity Jedi
> Master created this masterpiece (with a little assistance from me) which
> has resulted in no concerns regarding cooling on my plane. removable
> sections allow good access to the top and front of the engine.
> Paul Barfknecht
>
>
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