REFLECTOR: Intake Measurement

Fri Jan 9 08:47:46 CST 2015

That is exactly the plan I was going to do with my spare cowl.

I would dearly love to see some pictures.

On 01/09/2015 08:15 AM, Douglas Holub via Reflector 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 <mailto:reflector at tvbf.org>
> *Sent:* Thursday, January 08, 2015 11:57 PM
> *To:* paul barfknecht <mailto:ceraygun at inbox.com> ; Velocity Aircraft 
> Owners and Builders list <mailto: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.
> 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 <mailto: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 <mailto:ajlz72756 at yahoo.com>
>>     *Sent:* Thu, 8 Jan 2015 09:50:00 -0600
>>     *To:* ceraygun at inbox.com <mailto:ceraygun at inbox.com>,
>>     tmann at n200lz.com <mailto:tmann at n200lz.com>, reflector at tvbf.org
>>     <mailto: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 <mailto:reflector at tvbf.org>
>>     *Sent:* Wednesday, January 07, 2015 4:42 PM
>>     *To:* Thomas Mann <mailto:tmann at n200lz.com> ; Velocity Aircraft
>>     Owners and Builders list <mailto:reflector at tvbf.org> ; Velocity
>>     Reflector <mailto: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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