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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Sun Apr 10, 2011 2:58 am Post subject: New Intake manifold, 2200 with TBI |
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Last week I finished the building/installation of another version of
intake manifold for my 2200 engine. Weather had kept me from flying
it too much until yesterday, but I saw pretty dramatic results for
all the work. Previously, I was concerned about a consistent 100-120
degree F. "EGT spread" as it is displayed on my Grand Rapids EIS. As
a result of making the intake runner tubes longer, and bell-mouthing
the ends, the spread was reduced from that 100-120 F., down to about
30 degrees F. Yesterday I saw the spread come as narrow as...drum
roll....2 degrees F. Yes, two degrees Fahrenheit. This was not a
fluke reading, either, as I watched it go from about 30 down to 12,
to single digits, and it finally stopped at 2 degrees, and then began
climbing back up to about 30. I was running along at about 2970 rpm,
3.3 gallons per hour, with CHT's reading 264-296 F., and the EGT's
were in the 1324-1357 F area. So far, I'm pretty happy with it.
Now I'd like to monitor the engine for "EGT wander" as I call
it....max EGT that goes from one cylinder to another cylinder.
There's not much that can be done to avoid this, I don't think, but
it might be worth knowing when it occurs, like during mixture change,
or rpm change, etc.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop (64 x 30, P-tip)
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 35mm)
Status: flying...1094 hrs (since 3-27-2006)
do not archive
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
|
| Posted: Sun Apr 10, 2011 11:12 am Post subject: New Intake manifold, 2200 with TBI |
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I just flew my plane again (to answer a question from the Yahoo group
regarding the EGT spread at WOT) and here's what I found:
I just flew, and the WOT (flowing 6.0 gph) EGT spread was 140-155 F.,
but as soon as I lower the rpm, it drops to double digits.....mostly
staying in the 30-60 degree range over a range in rpm of 2700 to
3100. I again saw the EGT spread hit single digits briefly, then go
to the 30's for the rest of the time I had the EGT sp. page up. What
I really like is to see the EGT spread lower than the CHT spread!
While this may not be a big deal to some of the guys who don't care
about EGT's, it IS a big deal to me, because it shows that making a
different manifold WILL make this engine breathe properly. And for
once, the EGT's match the CHT's, cylinder for cylinder...that is, the
high EGT is associated with the high CHT, and the low with the low,
and in every case in between. The engine is also louder, indicating
to me that more horsepower is being produced....a very unscientific
observation, of course. : )
An interesting side note: When I had the rpm down to 27xx (slow
cruise), the fuel flow was 2.7 gph. When I raised the rpm to 28xx,
the fuel flow was 2.8 gph....it was almost like having a second tach,
as I could almost guess the rpm I was at by moving the decimal point
over three places on the fuel flow meter. This worked until I got
over 3000 rpm, and then the meter showed 3.2, 3.3, 3.4 and up to 4.0,
depending on the rpm, up to about 3250 where I quit comparing.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop (64 x 30, P-tip)
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 35mm)
Status: flying...1095 hrs (since 3-27-2006)
On Apr 10, 2011, at 6:55 AM, Lynn Matteson wrote:
| Quote: |
<lynnmatt(at)jps.net>
Last week I finished the building/installation of another version
of intake manifold for my 2200 engine. Weather had kept me from
flying it too much until yesterday, but I saw pretty dramatic
results for all the work. Previously, I was concerned about a
consistent 100-120 degree F. "EGT spread" as it is displayed on my
Grand Rapids EIS. As a result of making the intake runner tubes
longer, and bell-mouthing the ends, the spread was reduced from
that 100-120 F., down to about 30 degrees F. Yesterday I saw the
spread come as narrow as...drum roll....2 degrees F. Yes, two
degrees Fahrenheit. This was not a fluke reading, either, as I
watched it go from about 30 down to 12, to single digits, and it
finally stopped at 2 degrees, and then began climbing back up to
about 30. I was running along at about 2970 rpm, 3.3 gallons per
hour, with CHT's reading 264-296 F., and the EGT's were in the
1324-1357 F area. So far, I'm pretty happy with it.
Now I'd like to monitor the engine for "EGT wander" as I call
it....max EGT that goes from one cylinder to another cylinder.
There's not much that can be done to avoid this, I don't think, but
it might be worth knowing when it occurs, like during mixture
change, or rpm change, etc.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop (64 x 30, P-tip)
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 35mm)
Status: flying...1094 hrs (since 3-27-2006)
do not archive
|
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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aerobiz1(at)gmail.com
Guest
|
| Posted: Sun Apr 10, 2011 12:02 pm Post subject: New Intake manifold, 2200 with TBI |
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|
G'day Lynn,
That's certainly encouraging news !
Cheers
Martin
On Sun, Apr 10, 2011 at 8:55 PM, Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)> wrote:
[quote]--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)>
Last week I finished the building/installation of another version of intake manifold for my 2200 engine. Weather had kept me from flying it too much until yesterday, but I saw pretty dramatic results for all the work. Previously, I was concerned about a consistent 100-120 degree F. "EGT spread" as it is displayed on my Grand Rapids EIS. As a result of making the intake runner tubes longer, and bell-mouthing the ends, the spread was reduced from that 100-120 F., down to about 30 degrees F. Yesterday I saw the spread come as narrow as...drum roll....2 degrees F. Yes, two degrees Fahrenheit. This was not a fluke reading, either, as I watched it go from about 30 down to 12, to single digits, and it finally stopped at 2 degrees, and then began climbing back up to about 30. I was running along at about 2970 rpm, 3.3 gallons per hour, with CHT's reading 264-296 F., and the EGT's were in the 1324-1357 F area. So far, I'm pretty happy with it.
Now I'd like to monitor the engine for "EGT wander" as I call it....max EGT that goes from one cylinder to another cylinder. There's not much that can be done to avoid this, I don't think, but it might be worth knowing when it occurs, like during mixture change, or rpm change, etc.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop (64 x 30, P-tip)
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 35mm)
Status: flying...1094 hrs (since 3-27-2006)
do not archive
===========
-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
[b]
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
|
| Posted: Sun Apr 10, 2011 1:14 pm Post subject: New Intake manifold, 2200 with TBI |
|
|
G'day, Martin....I took some of your (and Jim's) advice on the
manifold size, but in making the plenum large enough to not impede
flow, it became about 58% of the engine size, while my old (homemade)
one was 28%. The largeness doesn't *seem* to hurt anything, but I
thought at first it was hindering throttle response. However, I'd
like to reduce the size of the plenum just to see what would happen
to all the numbers. Right now, I'm pretty happy with the results, but
tomorrow I might want to tweak it some more just for grins. : )
Lynn
On Apr 10, 2011, at 3:59 PM, Martin Hone wrote:
| Quote: | G'day Lynn,
That's certainly encouraging news !
Cheers
Martin
On Sun, Apr 10, 2011 at 8:55 PM, Lynn Matteson <lynnmatt(at)jps.net>
wrote:
<lynnmatt(at)jps.net>
Last week I finished the building/installation of another version
of intake manifold for my 2200 engine. Weather had kept me from
flying it too much until yesterday, but I saw pretty dramatic
results for all the work. Previously, I was concerned about a
consistent 100-120 degree F. "EGT spread" as it is displayed on my
Grand Rapids EIS. As a result of making the intake runner tubes
longer, and bell-mouthing the ends, the spread was reduced from
that 100-120 F., down to about 30 degrees F. Yesterday I saw the
spread come as narrow as...drum roll....2 degrees F. Yes, two
degrees Fahrenheit. This was not a fluke reading, either, as I
watched it go from about 30 down to 12, to single digits, and it
finally stopped at 2 degrees, and then began climbing back up to
about 30. I was running along at about 2970 rpm, 3.3 gallons per
hour, with CHT's reading 264-296 F., and the EGT's were in the
1324-1357 F area. So far, I'm pretty happy with it.
Now I'd like to monitor the engine for "EGT wander" as I call
it....max EGT that goes from one cylinder to another cylinder.
There's not much that can be done to avoid this, I don't think, but
it might be worth knowing when it occurs, like during mixture
change, or rpm change, etc.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop (64 x 30, P-tip)
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 35mm)
Status: flying...1094 hrs (since 3-27-2006)
do not archive
===========
-List" target="_blank">http://www.matronics.com/Navigator?
JabiruEngine-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
www.matronics.com/contribution _-
============================================================
|
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
|
| Back to top |
|
|
aerobiz1(at)gmail.com
Guest
|
| Posted: Sun Apr 10, 2011 2:02 pm Post subject: New Intake manifold, 2200 with TBI |
|
|
Lynn, you are a born tinkerer !
Cheers
Martin
On Mon, Apr 11, 2011 at 7:11 AM, Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)> wrote:
[quote]--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)>
G'day, Martin....I took some of your (and Jim's) advice on the manifold size, but in making the plenum large enough to not impede flow, it became about 58% of the engine size, while my old (homemade) one was 28%. The largeness doesn't *seem* to hurt anything, but I thought at first it was hindering throttle response. However, I'd like to reduce the size of the plenum just to see what would happen to all the numbers. Right now, I'm pretty happy with the results, but tomorrow I might want to tweak it some more just for grins. : )
Lynn
On Apr 10, 2011, at 3:59 PM, Martin Hone wrote:
| Quote: | G'day Lynn,
That's certainly encouraging news !
Cheers
Martin
On Sun, Apr 10, 2011 at 8:55 PM, Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)> wrote:
--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)>
Last week I finished the building/installation of another version of intake manifold for my 2200 engine. Weather had kept me from flying it too much until yesterday, but I saw pretty dramatic results for all the work. Previously, I was concerned about a consistent 100-120 degree F. "EGT spread" as it is displayed on my Grand Rapids EIS. As a result of making the intake runner tubes longer, and bell-mouthing the ends, the spread was reduced from that 100-120 F., down to about 30 degrees F. Yesterday I saw the spread come as narrow as...drum roll....2 degrees F. Yes, two degrees Fahrenheit. This was not a fluke reading, either, as I watched it go from about 30 down to 12, to single digits, and it finally stopped at 2 degrees, and then began climbing back up to about 30. I was running along at about 2970 rpm, 3.3 gallons per hour, with CHT's reading 264-296 F., and the EGT's were in the 1324-1357 F area. So far, I'm pretty happy with it.
Now I'd like to monitor the engine for "EGT wander" as I call it....max EGT that goes from one cylinder to another cylinder. There's not much that can be done to avoid this, I don't think, but it might be worth knowing when it occurs, like during mixture change, or rpm change, etc.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop (64 x 30, P-tip)
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 35mm)
Status: flying...1094 hrs (since 3-27-2006)
do not archive
===========
-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
www.mat====================
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===========
-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
[b]
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