Today's Message Index:
----------------------
1. 12:39 AM - Re: Engine cooling Louver Vents (Carl Meek)
2. 04:50 AM - Re: Engine cooling Louver Vents (FLYaDIVE)
3. 05:34 AM - Re: Engine cooling Louver Vents (FLYaDIVE)
4. 07:25 AM - Re: CHT's (AirEupora)
Message 1
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| Subject: | Re: Engine cooling Louver Vents |
Barry=85 I'm interested in your concept here, but I can't understand it.
Any chance of a photo?
I'm currently working on cooling my Jabiru 3300 in the Europa.
I've put a 5" lip on the bottom of the cowl exit and this has made a big
difference to temperatures in the climb, but it has highlighted uneven
cylinder cooling - so my next project is to put some dams to force air
between the middle cylinder, and also to route HT leads straight out
away from air-flow rather than the bundle of cables blocking it all up.
-Carl.
On 23 Jul 2012, at 01:21, FLYaDIVE wrote:
> Jeff:
>
> The hard and fast rule for forced air cooling is the EXHAUST area must
be at least TWICE the size INTAKE area.
> Another simple little trick in cooling is to create a negative
pressure area directly at the ramp exhaust port(s). This can be done
with a simple piece of aluminum strip 1 1/2 to 2" wide and long enough
to span the ramp area and bent lengthwise down the center-line at a 45
deg angle sort of like this
> ---> ___/ [But flip it so it angles DOWN] Then rivet it to the
edge of the air exhaust ramp. Works great and you will NEVER notice any
drag... Just lower temps.
>
> Barry
>
>
> On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris
<jeffrey-j-paris@excite.com> wrote:
> Gentlepeople,
>
> A few months ago someone out on our lists mentioned that they were
using some louvered vents in an aid to cooling their Jabiru
installation. I would be interested to see if anyone has some anecdotal
or actual experience with utilizing louvered vents on the bottom of a
cowl in an effort to aid and imnprove engine cooling.
>
> In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty
much dialed into in terms of cooling. However, I am also a builder of a
Jab 3300 powered Europa Classic Monowheel and due to the fact that the
footwells and the main landing gear truncate the bottom opening of the
cowl making a clean and big enough exit a bit "messy".
>
> I am curious to see if a set of vented louvers running parallel and
under each cylinder would create enough pull to enhance cooling?
(Bonanzas have em') Do the experts think I might have some luck with
just such an installation?
>
> Thanks for your time and consderation.
>
> Jeff Paris
>
>
> ist"
target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
>
>
>
Message 2
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| Subject: | Re: Engine cooling Louver Vents |
Carl:
You are in luck. I happen to have a set for a job I'm doing - - - I'll
take pictures and post them. It will happen just a little later this
morning.
Barry
On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek@gmail.com> wrote:
> Barry=85 I'm interested in your concept here, but I can't understand it.
> Any chance of a photo?
>
> I'm currently working on cooling my Jabiru 3300 in the Europa.
>
> I've put a 5" lip on the bottom of the cowl exit and this has made a big
> difference to temperatures in the climb, but it has highlighted uneven
> cylinder cooling - so my next project is to put some dams to force air
> between the middle cylinder, and also to route HT leads straight out away
> from air-flow rather than the bundle of cables blocking it all up.
>
> -Carl.
>
> On 23 Jul 2012, at 01:21, FLYaDIVE wrote:
>
> Jeff:
>
> The hard and fast rule for forced air cooling is the EXHAUST area must be
> at least TWICE the size INTAKE area.
> Another simple little trick in cooling is to create a negative pressure
> area directly at the ramp exhaust port(s). This can be done with a simpl
e
> piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp
> area and bent lengthwise down the center-line at a 45 deg angle sort of
> like this
> ---> ___/ [But flip it so it angles DOWN] Then rivet it to the edge o
f
> the air exhaust ramp. Works great and you will NEVER notice any drag...
> Just lower temps.
>
> Barry
>
>
> On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <
> jeffrey-j-paris@excite.com> wrote:
>
>> Gentlepeople,
>>
>> A few months ago someone out on our lists mentioned that they were usin
g
>> some louvered vents in an aid to cooling their Jabiru installation. I
>> would be interested to see if anyone has some anecdotal or actual
>> experience with utilizing louvered vents on the bottom of a cowl in an
>> effort to aid and imnprove engine cooling.
>>
>> In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty
>> much dialed into in terms of cooling. However, I am also a builder of a
>> Jab 3300 powered Europa Classic Monowheel and due to the fact that the
>> footwells and the main landing gear truncate the bottom opening of the c
owl
>> making a clean and big enough exit a bit "messy".
>>
>> I am curious to see if a set of vented louvers running parallel and
>> under each cylinder would create enough pull to enhance cooling? (Bonanz
as
>> have em') Do the experts think I might have some luck with just such an
>> installation?
>>
>> Thanks for your time and consderation.
>>
>> Jeff Paris
>>
>> *
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-L
isttp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>> *
>>
>>
> *
>
> href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.
matronics.com/Navigator?JabiruEngine-List
> href="http://forums.matronics.com/">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
ontribution
> *
>
>
> *
>
===========
===========
===========
===========
> *
>
>
Message 3
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| Subject: | Re: Engine cooling Louver Vents |
Hello Carl:
Quicker than I thought.
Here are some pictures:
1 - Pictures 1 & 2 show a side view of what it looks like. This flap is
for a large plane with a hidden exhaust ramp for the out going air so I had
it made 1" mounting lip and 2" of hang-down.
2 - Picture 3 is a isometric view. The length should be so it spans from
one end of an opening to the other. DO NOT MAKE IT SHORTER THAN THE SPAN.
3 - Picture 4 shows it mounted UNDER the lip of a desk... NO! The desk
does not have a over heating problem EXCEPT around April 15th. I mount it
with the mounting edge INSIDE the exit ramp. LQQKs better.
4 - Picture 5 shows a side view of how it should look when mounted.
Hope this helps. It works GREAT on the applications I have worked on.
REMEMBER - Without a good exhaust of air flow there cannot be a good input
of air flow. Exit must be at least TWICE the area of Intake.
AND! ! ! You must - Have a GREAT seal around the engine with the baffling.
Every little hole you plug helps improve the cooling.
Barry
PS
Start with a 45 Deg angle and reduce it from there <-- Reduce it only if
needed and if you wish. I have never reduced it on any of the installs I
have done. DO not go beyond 45 Deg - Not needed - Not any better and at
that point it becomes drag.
Same rules apply as for aileron trim tabs.
On Mon, Jul 23, 2012 at 3:38 AM, Carl Meek <carlmeek@gmail.com> wrote:
> Barry=85 I'm interested in your concept here, but I can't understand it.
> Any chance of a photo?
>
> I'm currently working on cooling my Jabiru 3300 in the Europa.
>
> I've put a 5" lip on the bottom of the cowl exit and this has made a big
> difference to temperatures in the climb, but it has highlighted uneven
> cylinder cooling - so my next project is to put some dams to force air
> between the middle cylinder, and also to route HT leads straight out away
> from air-flow rather than the bundle of cables blocking it all up.
>
> -Carl.
>
> On 23 Jul 2012, at 01:21, FLYaDIVE wrote:
>
> Jeff:
>
> The hard and fast rule for forced air cooling is the EXHAUST area must be
> at least TWICE the size INTAKE area.
> Another simple little trick in cooling is to create a negative pressure
> area directly at the ramp exhaust port(s). This can be done with a simpl
e
> piece of aluminum strip 1 1/2 to 2" wide and long enough to span the ramp
> area and bent lengthwise down the center-line at a 45 deg angle sort of
> like this
> ---> ___/ [But flip it so it angles DOWN] Then rivet it to the edge o
f
> the air exhaust ramp. Works great and you will NEVER notice any drag...
> Just lower temps.
>
> Barry
>
>
> On Fri, Jul 20, 2012 at 2:36 PM, Jeffrey J Paris <
> jeffrey-j-paris@excite.com> wrote:
>
>> Gentlepeople,
>>
>> A few months ago someone out on our lists mentioned that they were usin
g
>> some louvered vents in an aid to cooling their Jabiru installation. I
>> would be interested to see if anyone has some anecdotal or actual
>> experience with utilizing louvered vents on the bottom of a cowl in an
>> effort to aid and imnprove engine cooling.
>>
>> In my case I have a Jab3300 powered Zentith Zodiac in which I'm pretty
>> much dialed into in terms of cooling. However, I am also a builder of a
>> Jab 3300 powered Europa Classic Monowheel and due to the fact that the
>> footwells and the main landing gear truncate the bottom opening of the c
owl
>> making a clean and big enough exit a bit "messy".
>>
>> I am curious to see if a set of vented louvers running parallel and
>> under each cylinder would create enough pull to enhance cooling? (Bonanz
as
>> have em') Do the experts think I might have some luck with just such an
>> installation?
>>
>> Thanks for your time and consderation.
>>
>> Jeff Paris
>>
>> *
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-L
isttp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>> *
>>
>>
> *
>
> href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.
matronics.com/Navigator?JabiruEngine-List
> href="http://forums.matronics.com/">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
ontribution
> *
>
>
> *
>
===========
===========
===========
===========
> *
>
>
Message 4
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I have the 3300L and am having heating problems, but am slowly getting them in
range. Right now I have only three hours on the engine. It's 100 degrees most
days here in northern California. So I have to get up early to fly before it
gets hot. Yesterday I quit before I started the flight because of the ground
temps I was seeing.
I try to get off the ground before the CHT get to 302. Im sitting here reading
and I wondering if I'm put unnecessary limits on myself.
Paragraph 4.3 of 3300HL-IM
Warming Up Period, Ground Test
Start the warming up period with the engine running at 1000 RPM. Continue at 1400
RPM depending on ambient temperature, until oil temperature reaches 15C (59F).
Check the two ignition circuits at 2000 RPM. Note: - RPM with only one ignition
should not drop by more than 100 RPM.
DO NOT apply full power until CHT reaches 100C (212F)
DO NOT apply full power until Oil Temperature reaches 50C (104F)
DO NOT allow cylinder heads to rise above 150C (302F) during ground running.
Yesterday, I had to put gas in the plane before flight then taxi the length of
the runway before I got to the take off runway. Halfway down the taxiway the
CHT were too high. I had to shut the engine down because I was over the 302 mark
on cylinder six.
I usually have to taxi out and shut down once I reach the end of the runway and
point to plane into the wind. Oil temp are not at 104 degree for takeoff, but
CHT's are very close to 302. If I sit there for three to five minutes the oil
temp come up and I usually takeoff. My CHT's come up fast, but I have them
where they don't go over the 358 mark until 1000 feet are so. I back off the
power and push the nose over until I get some speed and watch the numbers on
the CHT's. Most time I'm at 2500 +- 200. Once the temps come down I power back
up.
My question is? Is the 302 temp something that I should watch closely on the ground
or is it something that once I reach the end of the taxiway for takeoff
I can get into the air with?
[/code]
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