Today's Message Index:
----------------------
0. 12:11 AM - Contributions Down By 17%... (Matt Dralle)
1. 05:25 AM - Re: Engine Shut Down (FLYaDIVE)
2. 05:41 AM - Re: Engine Shut Down (Kayberg@aol.com)
3. 06:14 AM - Re: Engine Shut Down (BobsV35B@aol.com)
4. 06:37 AM - Re: Engine Shut Down (Kayberg@aol.com)
5. 07:05 AM - Re: Engine Shut Down (BobsV35B@aol.com)
6. 10:00 AM - Re: Engine Shut Down (FLYaDIVE)
Message 0
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| Subject: | Contributions Down By 17%... |
Dear Listers,
As of today, Contributions to the Matronics List Fund Raiser are lagging behind
last year at this time by roughly 17%. I have a Fund Raiser each year simply
to cover my operating costs for the Lists. I *do not* accept any advertising
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I run all of my own servers and they are housed here locally, and the Internet
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data so that in the event of a server crash or worse, all of the Lists and
the many years of List archive data could be restored onto a new server in a matter
of hours.
All of this costs a fair amount of money, not to mention a significant amount of
my personal time. I have a Fund Raiser each year to cover these costs and I
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these services.
If you enjoy the Lists, please make a Contribution today. I also offer some incentive
gifts for larger Contribution levels. At the Contribution Web Wite, you
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Or, drop a personal check in the mail to:
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Thank you for your support!
Matt Dralle
Matronics Email List Administrator
Message 1
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| Subject: | Re: Engine Shut Down |
Very Good Dave:
Wait for it....
Wait for it....
BUT!
The internal temps of a cylinder are higher than CHT readings. BUT! You do
have about 60% of the question answered.
Think of it this way... What would cause the flash point to change?
Before I give the answer, lets try another question?
Sort of a HINT :-)
At what Temperature does water boil?
And remember this is a Loaded / Trick Question AND remember who is asking it
;-)
Barry
=====================================
On Sun, Nov 21, 2010 at 8:06 PM, Dave <d.goddard@ns.sympatico.ca> wrote:
> The autoignition temp of gasoline is just below 500 deg., below that it
> needs an ignition source. So maybe the answer is that flash point is not
> autoignition temp.
>
>
>> Noel
>>
>>
>>
>>
>>
>> Loaded Question: If the flash point of gas is so low, below that of
>> internal CHT why do we not Pre-Ignition all the time?
>>
>>
>>
>> Barry
>>
>>
>>
>>
>>
>>
>>
>>
> *
>
>
> *
>
>
Message 2
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| Subject: | Re: Engine Shut Down |
At the risk of messing up a perfectly good teacher-pupil exchange along
with some drama, could the word be "pressure'?
Pressure would increase the temperatures a la diesel.
However, Jabiru engines dont seem to diesel or at least I have never heard
of one doing it. And neither do Rotax 912s....which have even higher
compression.
Tell me again why we are even bothering to discuss Ly-Con's ?
Doug k.
In a message dated 11/22/2010 8:25:31 A.M. Eastern Standard Time,
flyadive@gmail.com writes:
Very Good Dave:
Wait for it....
Wait for it....
BUT!
The internal temps of a cylinder are higher than CHT readings. BUT! You
do have about 60% of the question answered.
Think of it this way... What would cause the flash point to change?
Before I give the answer, lets try another question?
Sort of a HINT :-)
At what Temperature does water boil?
And remember this is a Loaded / Trick Question AND remember who is asking
it ;-)
Barry
============
On Sun, Nov 21, 2010 at 8:06 PM, Dave <_d.goddard@ns.sympatico.ca_
(mailto:d.goddard@ns.sympatico.ca) > wrote:
The autoignition temp of gasoline is just below 500 deg., below that it
needs
Message 3
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| Subject: | Re: Engine Shut Down |
Good Morning Doug k.
You asked: "Tell me again why we are even bothering to discuss Ly-Con's
?"
Because we are here to learn and all Otto Cycle engines have the same
principles of operation. If you are a trained engineer with many years of hands
on development of this art, this is probably a waste of time. However, for
those of us who are still learning, we need to understand how the problems
have been solved in the past so that we can do a better job of
understanding the variances in our Jabiru engines.
All part of the learning process.
Make any better sense that way?
Happy Skies,
Old Bob
Legend Cub
Jabiru 3300
(Not mine, my granddaughter's.)
In a message dated 11/22/2010 7:41:23 A.M. Central Standard Time,
Kayberg@aol.com writes:
At the risk of messing up a perfectly good teacher-pupil exchange along
with some drama, could the word be "pressure'?
Pressure would increase the temperatures a la diesel.
However, Jabiru engines dont seem to diesel or at least I have never heard
of one doing it. And neither do Rotax 912s....which have even higher
compression.
Tell me again why we are even bothering to discuss Ly-Con's ?
Doug k.
Message 4
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| Subject: | Re: Engine Shut Down |
Old Bob, yours is a thoughtful answer.
However, how far back do we need to go? There are literally volumes
written about Otto Cycle and many many engineers who delight in sharing their
knowlege.....
And when you compare one engine design to another, many other possiblites
emerge. For example, is the Jabiru more like your lawn mower or more like
a Lycoming? Your lawn mower is not shut off by leaning the mixture, just
by grounding the equivalent of a P-lead. In that sense a Jabiru is more
like your lawn mower. (unless you have an electric one...but that uses a
switch also)
I am just hoping this thread does not turn into an engineers nightmare.
Doug Koenigsberg
In a message dated 11/22/2010 9:14:46 A.M. Eastern Standard Time,
BobsV35B@aol.com writes:
Good Morning Doug k.
You asked: "Tell me again why we are even bothering to discuss Ly-Con's
?"
Because we are here to learn and all Otto Cycle engines have the same
principles of operation. If you are a trained engineer with many years of hands
on development of this art, this is probably a waste of time. However, for
those of us who are still learning, we need to understand how the problems
have been solved in the past so that we can do a better job of
understanding the variances in our Jabiru engines.
All part of the learning process.
Make any better sense that way?
Happy Skies,
Old Bob
Legend Cub
Jabiru 3300
(Not mine, my granddaughter's.)
In a message dated 11/22/2010
Message 5
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| Subject: | Re: Engine Shut Down |
Good Morning Doug,
Agreed! In fact we often err in many operations because "It has always been
done that way."
Shutting down the engine by taking away it's fuel is just one of those
habits that do not necessarily serve any real purpose. When doing repetitive
flights such as passenger hops and Young Eagle flights some engines start a
lot easier if the switch is used for that purpose. I find no heartburn at
all when I shut down the Jabiru by turning off the ignition switch.
We could probably write volumes about all of the Old Wives Tales concerning
piston engine operation.
All part of our continuing education!
Happy Skies,
Old Bob
PS As for the lawn mower and Lycoming, they both suck, push, bang, and
blow! <G>
In a message dated 11/22/2010 8:38:05 A.M. Central Standard Time,
Kayberg@aol.com writes:
Old Bob, yours is a thoughtful answer.
However, how far back do we need to go? There are literally volumes
written about Otto Cycle and many many engineers who delight in sharing their
knowlege.....
And when you compare one engine design to another, many other possiblites
emerge. For example, is the Jabiru more like your lawn mower or more like
a Lycoming? Your lawn mower is not shut off by leaning the mixture, just
by grounding the equivalent of a P-lead. In that sense a Jabiru is more
like your lawn mower. (unless you have an electric one...but that uses a
switch also)
I am just hoping this thread does not turn into an engineers nightmare.
Doug Koenigsberg
Message 6
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| Subject: | Re: Engine Shut Down |
BINGO DOUG - BINGO!
Go to the head of the class ;-)
Pressure increases the flash point.
Barry
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