Today's Message Index:
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1. 10:34 AM - Re: Cylinder Baffles (Gary L Vogt)
2. 08:47 PM - Re: Cylinder Baffles (Discover)
3. 08:58 PM - Re: Cylinder Baffles (Discover)
Message 1
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| Subject: | Re: Cylinder Baffles |
First of all, Hi. How are you and Gina doing? Well, I hope.
1. The drawings you provided have nothing to do with our engines.
2. There is no flat surface on top to make curved to do what the drawing shows.
3. You can do all you want with the bottom of the baffles. Its your time and your
money. You wont see a significant change.
4. Do you have cooling problems?
What you want is pressure drop across the cylinders. That creates the flow of
air. The baffles for the Jaguar cowling are the result of a lot of trial and
error on stock baffles.
Id love to hear about your results of modifying the baffles.
Gary
> On Feb 29, 2016, at 9:05 PM, Discover <923te@att.net> wrote:
>
>
> The baffles you developed and got approved are very well done. I think they are
resposible for a lot of the cooling improvement my Tiger has. I've been doing
some reading lately and found a couple interesting studies that make me want
to try a change to the baffles under the cylinder heads where the air exits.
I'd like to try extending the curved down portion of the baffle by an inch or
two. See Picture Below.
> I was interested in Your opinion.
>
> Two of the articles I was reading are:
> http://www.dtic.mil/dtic/tr/fulltext/u2/a800800.pdf
> http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081408.pdf
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=453324#453324
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/image_861.jpeg
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: Cylinder Baffles |
The articles are in depth studies of cylinders from the radial engine of 1930's
vintage. They are very much like ours as you can see from the photos within the
articles.
The conclusions are quite interesting and address my interest where it says:
CONCLUSIONS
1. A 20-percent increase in cooling was obtained by the use of a properly designed
baffle exit. This gain corresponds to that which can be obtained when the
standard baffle with a 65-percent increase in pressure drop across the baffle
is used.
2. The baffle-exit radius and width and exit-duct
length were found to be the most critical parts of the
baffle.
This along with the other articles findings seem to be telling me there may even
be more significant improvement possible than we have gotten with the new baffles.
The baffles that came with my Jaguar cowl are a vast improvement over the factory
baffles even when the factory baffles are brand new. I have recommended them
to several people. It is only my experimenter /racing demands that is at work
here coupled with my engineering mind that is asking along the lines of a quote
I first learned of from Gary's AUCountry website,
that cause me to continue to pursue and ask the question...
"Never leave well enough alone." Ramond Loewy
The air exiting the cylinders and heads must make a 90 degree turn and that is
cause for a big loss of energy. This concept was recently pointed out to me in
a discussion of the Tiger air box compared to the AG5B airbox. Turns out that
there are several 90 degree turns with air in our Tigers...
Best,
Ned
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=453404#453404
Message 3
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| Subject: | Re: Cylinder Baffles |
If you think that adding diffusers to the air exits on the bottom of the heads
and cylinders is just too far out there then try looking at it after seeing the
extreme this guy went to improve cooling drag...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=453405#453405
Attachments:
http://forums.matronics.com//files/image_116.jpeg
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