Today's Message Index:
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1. 07:21 AM - Re: CHT still high after cowling modification (jets size?) (dons701)
2. 12:11 PM - Re: CHT still high after cowling modification (jets size?) (Jose M. Toro)
3. 12:51 PM - Re: CHT still high after cowling modification (jets size?) (Rob Turk)
4. 01:22 PM - Re: CHT still high after cowling modification (jets size?) (Martin Hone)
5. 03:08 PM - Re: CHT still high after cowling modification (jets size?) (Jose M. Toro)
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| Subject: | Re: CHT still high after cowling modification (jets |
size?)
Hi Jose. The purpose of the holes is to bleed some cooling air over the front
crank bearing, but you can duct tape them closed as an experiment. I found gaps
around the bottom perimeter of my ducts where air could leak and not flow through
the fins so I filled these gaps with strips of high temp foam silicone rubber
glued to the duct. Then, you can remove the tape from the holes.
I remember your peak head temp being 400F. If true, that alone can raise oil temperature.
But, having peak egt's at 1500F tends to conduct to the head and it's
thermocouple.....Which increases oil temps.
Did you pull any spark plugs for color check??
It is easy to change your main jet, it requires an 8mm box wrench I believe
and be sure to have a good magnifying glass handy to see the jet number! I would
not be afraid of a #240 or a #245 main jet, even with the #276 needle jet and
it's "matching" needle as supplied with your carb. Make sure there is a brass
flat washer behind the jet. It's there to prevent cavitation of air, (whirlpool)
into fuel around jet body, supposedly. Fuel level should be close to 12mm
from the top when bowl is carefully lowered, (not easy without spilling).
Questions;
What is your peak RPM and EGT, full throttle, climb out?
What is your EGT at cruise RPM, part throttle at say around 2800RPM?
What type of temperature measurement system are you using? EIS? Single analog,
digital? Individual cylinder capability? Or group measurement?
My thoughts are, get full throttle EGT's to 1200F to 1225F.
Cruise EGT's, if around 2800 or so, around 1325F.
Once you get these temps under control, the demand being placed on your "cooling
systems" will be greatly reduced.
Hope this helps....DonB
--------
Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=359106#359106
Message 2
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| Subject: | Re: CHT still high after cowling modification (jets |
size?)
Happy Thabksgiving Day to All!
Rob:
My needle jet is 276 and the main jet is 220. I already bought drills to op
en main jet to 249 and needle jet to 288.
Looking at the front cover of the EAA new catalog, I realized that I need to
raise the cowling entrances to the cooling baffles, in order to increase th
e airflow in top of the cylinders. Then, I proceed to study the latest pictu
res that you sent of your cowling. It is not clear to me how is the couplin
g between your cowling upper and lower parts, and the cooling baffles. Coul
d you send me pictures of your cooling baffles?
Jose
Sent from my iPhone
On Nov 22, 2011, at 10:31 AM, Rob Turk <matronics@rtist.nl> wrote:
> Jose,
>
> Get JSB018-2 from the Jabiru site, it shows what jets should be installed.
If you have the economy kit installed then your needle jet is too small. St
andard is 290. That could well explain your hight EGT's. If you do not have t
he economy kit installed, then check on page 4 what the standard jets for yo
ur serial number are.
>
> Rob
>
> On 11/22/2011 3:00 PM, Jose M. Toro wrote:
>>
>> All:
>>
>> The combination of main jet and needle jet is the next area that I will "
attack". I know my needle jet is 2.76, and will find out the main jet's siz
e on Friday.
>>
>> In the mean time, I would like to know what combination of main jets and n
eedle jets you are using, in order to have an idea of what jets I will need t
o order.
>>
>> Jose
>>
>> From: Martin Hone <aerobiz1@gmail.com>
>> To: jabiruengine-list@matronics.com
>> Sent: Monday, November 21, 2011 3:22 PM
>> Subject: Re: JabiruEngine-List: CHT still high after cowling modification
>>
>> Hi Jose,
>>
>> Without taking measurements, from your pics I don't see any outstanding r
eason for your high temps.
>> The high EGT's indicate to me that you are running lean and I would addre
ss that first by checking float height, then use a larger needle jet and lar
ger main jet.
>> If you get your EGT's down, CHT's etc should follow. I figure your engin
e is still new and therefore tight, which doesn't help. Are those temp read
ing taken at full throttle or cruise ?
>>
>> Martin
>>
>> On Tue, Nov 22, 2011 at 3:38 AM, Jose M. Toro <jose_m_toro@yahoo.com> wro
te:
>> Hi All:
>>
>> On saturday, I performed the third flight on my Rans S6ES/Jab 2200 after m
odifying the cowling to improve the air exit. Following are the highest tem
peratures observed:
>>
>> Oil temp:231 F, Oil pressure: 27 psi
>> CHT: 400 F
>> EGT: 1500 F
>>
>> The change performed to the cowling made no difference on the observed te
mperatures. I changed the cht senders for the right cylinders, and have no r
eason to suspect that the readings are not accurate.
>>
>> I create the following album, Rans S6 Jab 2200 Cooling System, showing th
e complete installation.
>> http://groups.yahoo.com/group/jabiruengines/photos/album/884873074/pic/li
st
>>
>> I'm running out of tricks, and at this point am seriously considering Liq
uid Cooled Heads. Pete, Lynn, John, Rob and the other listers, based on my p
ictures, do you have any other recommendation?
>>
>> Thanks for your support during this long journey...
>>
>> Jose Toro
>> Rans S6ES/Jab 2200 Solid Lifters, SN 1905
>>
>>
>> _blank">www.aeroelectric.com
>> .com" target="_blank">www.buildersbooks.com
>> ="_blank">www.homebuilthelp.com
>> _blank">http://www.matronics.com/contribution
>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-Li
st
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>>
>>
>>
>>
>> _blank rel=nofollow>www.aeroelectric.com
>> /" target=_blank rel=nofollow>www.buildersbooks.com
>> =_blank rel=nofollow>www.homebuilthelp.com
>> blank rel=nofollow>http://www.matronics.com/contribution
>>
>>
>>
>>
>>
>>
>
>
>
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>
Message 3
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| Subject: | Re: CHT still high after cowling modification (jets |
size?)
Hi Jose,
Those are reeeealy small needles, it's no surprise that your engine is
running lean. Your engine has the very first economy kit installed which
was superseded in 2007 by kits that supplied more fuel to the engine. Be
very careful when you drill the jets, make sure all burrs are gone and
the jets are entirely clean before you go out to fly. Perhaps better is
to order a 245 main jet from a nearby Jabiru dealer. You may even be
able to find them at a local BMW shop with a bit of Bing stock.
I would be happy to send you pictures, except my engine is in the UK
(without my plane attached..) and I will pick it up in just over a week.
Rob
On 11/24/2011 9:08 PM, Jose M. Toro wrote:
> Happy Thabksgiving Day to All!
>
> Rob:
>
> My needle jet is 276 and the main jet is 220. I already bought drills
> to open main jet to 249 and needle jet to 288.
> Looking at the front cover of the EAA new catalog, I realized that I
> need to raise the cowling entrances to the cooling baffles, in order
> to increase the airflow in top of the cylinders. Then, I proceed to
> study the latest pictures that you sent of your cowling. It is not
> clear to me how is the coupling between your cowling upper and lower
> parts, and the cooling baffles. Could you send me pictures of your
> cooling baffles?
>
> Jose
>
Message 4
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| Subject: | Re: CHT still high after cowling modification (jets |
size?)
Jose,
You should be on the right track now with the re-jetting...
Martin
On Fri, Nov 25, 2011 at 6:08 AM, Jose M. Toro <jose_m_toro@yahoo.com> wrote:
> Happy Thabksgiving Day to All!
>
> Rob:
>
> My needle jet is 276 and the main jet is 220. I already bought drills to
> open main jet to 249 and needle jet to 288.
> Looking at the front cover of the EAA new catalog, I realized that I need
> to raise the cowling entrances to the cooling baffles, in order to increase
> the airflow in top of the cylinders. Then, I proceed to study the latest
> pictures that you sent of your cowling. It is not clear to me how is the
> coupling between your cowling upper and lower parts, and the cooling
> baffles. Could you send me pictures of your cooling baffles?
>
> Jose
>
> Sent from my iPhone
>
> On Nov 22, 2011, at 10:31 AM, Rob Turk <matronics@rtist.nl> wrote:
>
> Jose,
>
> Get JSB018-2 from the Jabiru site, it shows what jets should be installed.
> If you have the economy kit installed then your needle jet is too small.
> Standard is 290. That could well explain your hight EGT's. If you do not
> have the economy kit installed, then check on page 4 what the standard jets
> for your serial number are.
>
> Rob
>
> On 11/22/2011 3:00 PM, Jose M. Toro wrote:
>
> All:
>
> The combination of main jet and needle jet is the next area that I will
> "attack". I know my needle jet is 2.76, and will find out the main jet's
> size on Friday.
>
> In the mean time, I would like to know what combination of main jets and
> needle jets you are using, in order to have an idea of what jets I will
> need to order.
>
> Jose
>
> *From:* Martin Hone <aerobiz1@gmail.com> <aerobiz1@gmail.com>
> *To:* jabiruengine-list@matronics.com
> *Sent:* Monday, November 21, 2011 3:22 PM
> *Subject:* Re: JabiruEngine-List: CHT still high after cowling
> modification
>
> Hi Jose,
>
> Without taking measurements, from your pics I don't see any outstanding
> reason for your high temps.
> The high EGT's indicate to me that you are running lean and I would
> address that first by checking float height, then use a larger needle jet
> and larger main jet.
> If you get your EGT's down, CHT's etc should follow. I figure your engine
> is still new and therefore tight, which doesn't help. Are those temp
> reading taken at full throttle or cruise ?
>
> Martin
>
> On Tue, Nov 22, 2011 at 3:38 AM, Jose M. Toro <jose_m_toro@yahoo.com>wrote:
>
> Hi All:
>
> On saturday, I performed the third flight on my Rans S6ES/Jab 2200 after
> modifying the cowling to improve the air exit. Following are the highest
> temperatures observed:
>
> Oil temp:231 F, Oil pressure: 27 psi
> CHT: 400 F
> EGT: 1500 F
>
> The change performed to the cowling made no difference on the observed
> temperatures. I changed the cht senders for the right cylinders, and have
> no reason to suspect that the readings are not accurate.
>
> I create the following album, *Rans S6 Jab 2200 Cooling System*, showing
> the complete installation.
> http://groups.yahoo.com/group/jabiruengines/photos/album/884873074/pic/list
>
> I'm running out of tricks, and at this point am seriously considering
> Liquid Cooled Heads. Pete, Lynn, John, Rob and the other listers, based on
> my pictures, do you have any other recommendation?
>
> Thanks for your support during this long journey...
>
> Jose Toro
> Rans S6ES/Jab 2200 Solid Lifters, SN 1905
>
> *
>
> _blank">www.aeroelectric.com
> .com" target="_blank">www.buildersbooks.com
> ="_blank">www.homebuilthelp.com
> _blank">http://www.matronics.com/contribution
> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
> *
>
>
> *
>
> _blank rel=nofollow>www.aeroelectric.com
> /" target=_blank rel=nofollow>www.buildersbooks.com
> =_blank rel=nofollow>www.homebuilthelp.com
> blank rel=nofollow>http://www.matronics.com/contribution
> *
>
>
> *
>
> *
>
>
> *
>
> *
>
> *
>
> *
>
>
Message 5
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| Subject: | Re: CHT still high after cowling modification (jets |
size?)
Martin:
Thanks for the advice of drilling the jets
Jose
Sent from my iPhone
On Nov 24, 2011, at 5:19 PM, Martin Hone <aerobiz1@gmail.com> wrote:
> Jose,
>
> You should be on the right track now with the re-jetting...
>
> Martin
>
> On Fri, Nov 25, 2011 at 6:08 AM, Jose M. Toro <jose_m_toro@yahoo.com> wrot
e:
> Happy Thabksgiving Day to All!
>
> Rob:
>
> My needle jet is 276 and the main jet is 220. I already bought drills to o
pen main jet to 249 and needle jet to 288.
> Looking at the front cover of the EAA new catalog, I realized that I need t
o raise the cowling entrances to the cooling baffles, in order to increase t
he airflow in top of the cylinders. Then, I proceed to study the latest pict
ures that you sent of your cowling. It is not clear to me how is the coupli
ng between your cowling upper and lower parts, and the cooling baffles. Cou
ld you send me pictures of your cooling baffles?
>
> Jose
>
> Sent from my iPhone
>
> On Nov 22, 2011, at 10:31 AM, Rob Turk <matronics@rtist.nl> wrote:
>
>> Jose,
>>
>> Get JSB018-2 from the Jabiru site, it shows what jets should be installed
. If you have the economy kit installed then your needle jet is too small. S
tandard is 290. That could well explain your hight EGT's. If you do not have
the economy kit installed, then check on page 4 what the standard jets for y
our serial number are.
>>
>> Rob
>>
>> On 11/22/2011 3:00 PM, Jose M. Toro wrote:
>>>
>>> All:
>>>
>>> The combination of main jet and needle jet is the next area that I will "
attack". I know my needle jet is 2.76, and will find out the main jet's siz
e on Friday.
>>>
>>> In the mean time, I would like to know what combination of main jets and
needle jets you are using, in order to have an idea of what jets I will nee
d to order.
>>>
>>> Jose
>>>
>>> From: Martin Hone <aerobiz1@gmail.com>
>>> To: jabiruengine-list@matronics.com
>>> Sent: Monday, November 21, 2011 3:22 PM
>>> Subject: Re: JabiruEngine-List: CHT still high after cowling modificatio
n
>>>
>>> Hi Jose,
>>>
>>> Without taking measurements, from your pics I don't see any outstanding r
eason for your high temps.
>>> The high EGT's indicate to me that you are running lean and I would addr
ess that first by checking float height, then use a larger needle jet and la
rger main jet.
>>> If you get your EGT's down, CHT's etc should follow. I figure your engi
ne is still new and therefore tight, which doesn't help. Are those temp rea
ding taken at full throttle or cruise ?
>>>
>>> Martin
>>>
>>> On Tue, Nov 22, 2011 at 3:38 AM, Jose M. Toro <jose_m_toro@yahoo.com> wr
ote:
>>> Hi All:
>>>
>>> On saturday, I performed the third flight on my Rans S6ES/Jab 2200 after
modifying the cowling to improve the air exit. Following are the highest t
emperatures observed:
>>>
>>> Oil temp:231 F, Oil pressure: 27 psi
>>> CHT: 400 F
>>> EGT: 1500 F
>>>
>>> The change performed to the cowling made no difference on the observed t
emperatures. I changed the cht senders for the right cylinders, and have no
reason to suspect that the readings are not accurate.
>>>
>>> I create the following album, Rans S6 Jab 2200 Cooling System, showing t
he complete installation.
>>> http://groups.yahoo.com/group/jabiruengines/photos/album/884873074/pic/l
ist
>>>
>>> I'm running out of tricks, and at this point am seriously considering Li
quid Cooled Heads. Pete, Lynn, John, Rob and the other listers, based on my
pictures, do you have any other recommendation?
>>>
>>> Thanks for your support during this long journey...
>>>
>>> Jose Toro
>>> Rans S6ES/Jab 2200 Solid Lifters, SN 1905
>>>
>>>
>>> _blank">www.aeroelectric.com
>>> .com" target="_blank">www.buildersbooks.com
>>> ="_blank">www.homebuilthelp.com
>>> _blank">http://www.matronics.com/contribution
>>> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-L
ist
>>> tp://forums.matronics.com
>>> _blank">http://www.matronics.com/contribution
>>>
>>>
>>>
>>>
>>> _blank rel=nofollow>www.aeroelectric.com
>>> /" target=_blank rel=nofollow>www.buildersbooks.com
>>> =_blank rel=nofollow>www.homebuilthelp.com
>>> blank rel=nofollow>http://www.matronics.com/contribution
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>
>
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> >
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>
>
>
>
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