Today's Message Index:
----------------------
1. 04:51 PM - CHT issues on a 3300 (Jeffrey J Paris)
2. 04:51 PM - CHT issues on a 3300 (Jeffrey J Paris)
3. 08:13 PM - Re: CHT issues on a 3300 (Martin Hone)
Message 1
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| Subject: | CHT issues on a 3300 |
=C2-
Dear Gurus of the Jabiru Engine World,
=C2-
I am currently back in flight test mode after finishing the "B" mods to my Z
enith CH601XL. Before the Mods I was having CHT issues with the engine after
I had installed the recommended " economy carb tuning kit" from Jabiru USA
when we attended their excellent engine seminar. =C2-Since then I have bee
n battling High CHT's on my #2, #3, #4, #5 cylinders. =C2-#1 runs cool and
#6 is in the 260 F range.
=C2-
=C2-I have attempted all sorts of methods in an attempt to improve the coo
ling of my heads. =C2-(See attached pictures) =C2-During my second to la
st flight I removed all of my "enhancements" and just went back to factory F
WF. =C2-Here are the known Facts of my engine:
=C2-
A) =C2-All CHT senders are placed between the plug and a washer (per Pete
Krotje of Jab USA)
=C2-
B) I added a fiberglass cross flow to my rubber elbow to "smooth" out the ai
r in my induction system into the carb.
=C2-
C) Jettting in the Carb =C2-Main Jet #255 Needle Jet #285 ( Per Ben Krotje
Jab USA)
=C2-
D) =C2-My Flight Today in stabilized cruise of 2300 RPM to get my lowest C
HT #'s:
=C2-
Cylinder # =C2- =C2- =C2- =C2-EGT =C2- =C2- =C2- =C2- CHT
=C2-
1 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1320 =C2- =C2- =C2- =C2-256
2 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1302 =C2- =C2- =C2- =C2-313
3 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1306 =C2- =C2- =C2- =C2-335
4 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1343 =C2- =C2- =C2- =C2-324
5 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1212 =C2- =C2- =C2- =C2-296
6 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1308 =C2- =C2- =C2- =C2-251
=C2-
E) Oil temp 198 degrees F
F) Pulled plugs burning a nice tan color, exhaust soot is a nice grayish tan
as well.
G) =C2-Engine starts on first throw of the starter key, but I have to get
throttle up or she stalls with the choke-on ( result of Economy tuning mods)
H)m =C2-Warm engine start is a no brainer.
=C2-
=C2-=C2-Any RPMs past 2300 up to 3000 results in cylinders 2, 3,4, 5
=C2-approaching and hitting 350 degress F. =C2-I pull back on the thrott
le and aim my nose down to get things at least into the "yellow zone" of my
AuRacle Engine Monitor indications. =C2-I have tried all sorts of baffling
, extending the lip on my cowls exit for airflow, =C2-played with the jett
ing and induction system of my carb, and listened to all the suggestion =C2
-threads on the internet and still haven't got things under control.
=C2-
Any ideas or insights, pictures would be of great help. =C2-Thanks for you
r time and consideration.
=C2-
Cheers,
=C2-
Jeff Paris =C2- Jab 3300 Zenith Ch601XLB =C2-and Jab 3300 Europa Monowhe
el Classic =C2- Rochester, NY KSDC
=C2-
=C2-
Message 2
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| Subject: | CHT issues on a 3300 |
=C2-
Dear Gurus of the Jabiru Engine World,
=C2-
I am currently back in flight test mode after finishing the "B" mods to my Z
enith CH601XL. Before the Mods I was having CHT issues with the engine after
I had installed the recommended " economy carb tuning kit" from Jabiru USA
when we attended their excellent engine seminar. =C2-Since then I have bee
n battling High CHT's on my #2, #3, #4, #5 cylinders. =C2-#1 runs cool and
#6 is in the 260 F range.
=C2-
=C2-I have attempted all sorts of methods in an attempt to improve the coo
ling of my heads. =C2-(See attached pictures) =C2-During my second to la
st flight I removed all of my "enhancements" and just went back to factory F
WF. =C2-Here are the known Facts of my engine:
=C2-
A) =C2-All CHT senders are placed between the plug and a washer (per Pete
Krotje of Jab USA)
=C2-
B) I added a fiberglass cross flow to my rubber elbow to "smooth" out the ai
r in my induction system into the carb.
=C2-
C) Jettting in the Carb =C2-Main Jet #255 Needle Jet #285 ( Per Ben Krotje
Jab USA)
=C2-
D) =C2-My Flight Today in stabilized cruise of 2300 RPM to get my lowest C
HT #'s:
=C2-
Cylinder # =C2- =C2- =C2- =C2-EGT =C2- =C2- =C2- =C2- CHT
=C2-
1 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1320 =C2- =C2- =C2- =C2-256
2 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1302 =C2- =C2- =C2- =C2-313
3 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1306 =C2- =C2- =C2- =C2-335
4 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1343 =C2- =C2- =C2- =C2-324
5 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1212 =C2- =C2- =C2- =C2-296
6 =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2- =C2
- =C2-1308 =C2- =C2- =C2- =C2-251
=C2-
E) Oil temp 198 degrees F
F) Pulled plugs burning a nice tan color, exhaust soot is a nice grayish tan
as well.
G) =C2-Engine starts on first throw of the starter key, but I have to get
throttle up or she stalls with the choke-on ( result of Economy tuning mods)
H)m =C2-Warm engine start is a no brainer.
=C2-
=C2-=C2-Any RPMs past 2300 up to 3000 results in cylinders 2, 3,4, 5
=C2-approaching and hitting 350 degress F. =C2-I pull back on the thrott
le and aim my nose down to get things at least into the "yellow zone" of my
AuRacle Engine Monitor indications. =C2-I have tried all sorts of baffling
, extending the lip on my cowls exit for airflow, =C2-played with the jett
ing and induction system of my carb, and listened to all the suggestion =C2
-threads on the internet and still haven't got things under control.
=C2-
Any ideas or insights, pictures would be of great help. =C2-Thanks for you
r time and consideration.
=C2-
Cheers,
=C2-
Jeff Paris =C2- Jab 3300 Zenith Ch601XLB =C2-and Jab 3300 Europa Monowhe
el Classic =C2- Rochester, NY KSDC
=C2-
=C2-
Message 3
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| Subject: | Re: CHT issues on a 3300 |
Hi Jeff,
This is what has worked for me.......
1. Measure your actual Main Jet orifice with a metric drill or guage. I
found the stamped size (#255 was actually #250, so I took it out to #260 -
so from 2.5mm to 2.6mm)
2. Removed the plenum chamber airfoil-shaped flow divider and placed a 1/2
inch diam tube/rod in its place.
3. Drilled the main airbleed out to 3/16 inch _ that's the one that goes
from the intake bellmouth straight to the needle jet emulsion tube. Remove
these, drill airbleed carefully and remove swarf, then before replacing the
separate emulsion tube with its 4 x 2.5 mm holes, drill these 4 holes out to
3mm.
While you are about it, you can drill out the choke system fuel bleed jet in
the float bowl to 1 - 1.2 mm, and the idle airbleed jet in the bellmouth to
1.2 mm and use #35 pilot jet.
FWIW,
Martin
J230
On Mon, Jun 6, 2011 at 9:47 AM, Jeffrey J Paris
<jeffrey-j-paris@excite.com>wrote:
>
> Dear Gurus of the Jabiru Engine World,
>
> I am currently back in flight test mode after finishing the "B" mods to my
> Zenith CH601XL. Before the Mods I was having CHT issues with the engine
> after I had installed the recommended " economy carb tuning kit" from Jabiru
> USA when we attended their excellent engine seminar. Since then I have been
> battling High CHT's on my #2, #3, #4, #5 cylinders. #1 runs cool and #6 is
> in the 260 F range.
>
> I have attempted all sorts of methods in an attempt to improve the
> cooling of my heads. (See attached pictures) During my second to last
> flight I removed all of my "enhancements" and just went back to factory FWF.
> Here are the known Facts of my engine:
>
> A) All CHT senders are placed between the plug and a washer (per Pete
> Krotje of Jab USA)
>
> B) I added a fiberglass cross flow to my rubber elbow to "smooth" out the
> air in my induction system into the carb.
>
> C) Jettting in the Carb Main Jet #255 Needle Jet #285 ( Per Ben Krotje
> Jab USA)
>
> D) My Flight Today in stabilized cruise of 2300 RPM to get my lowest CHT
> #'s:
>
> Cylinder # EGT CHT
>
> 1 1320 256
> 2 1302 313
> 3 1306 335
> 4 1343 324
> 5 1212 296
> 6 1308 251
>
> E) Oil temp 198 degrees F
> F) Pulled plugs burning a nice tan color, exhaust soot is a nice grayish
> tan as well.
> G) Engine starts on first throw of the starter key, but I have to get
> throttle up or she stalls with the choke-on ( result of Economy tuning mods)
> H)m Warm engine start is a no brainer.
>
> Any RPMs past 2300 up to 3000 results in cylinders 2, 3,4, 5
> approaching and hitting 350 degress F. I pull back on the throttle and aim
> my nose down to get things at least into the "yellow zone" of my AuRacle
> Engine Monitor indications. I have tried all sorts of baffling, extending
> the lip on my cowls exit for airflow, played with the jetting and induction
> system of my carb, and listened to all the suggestion threads on the
> internet and still haven't got things under control.
>
> Any ideas or insights, pictures would be of great help. Thanks for your
> time and consideration.
>
> Cheers,
>
> Jeff Paris Jab 3300 Zenith Ch601XLB and Jab 3300 Europa Monowheel
> Classic Rochester, NY KSDC
>
>
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