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jose_m_toro(at)yahoo.com
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 Posted: Tue Nov 22, 2011 6:04 am Post subject: CHT still high after cowling modification (jets size?) |
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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(at)gmail.com>
To: jabiruengine-list(at)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(at)yahoo.com (jose_m_toro(at)yahoo.com)> wrote:
[quote] 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
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wypaul
Joined: 08 Jun 2007
Posts: 24
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| Posted: Wed Nov 23, 2011 6:00 pm Post subject: Re: CHT still high after cowling modification (jets size?) |
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Jose,
I would seal off the large holes on the inside of the cooling ducts. These appear to be about 1-1.5 inches.
Paul
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Paul Spackman
Q-2 Jabiru 3300 |
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jose_m_toro(at)yahoo.com
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| Posted: Wed Nov 23, 2011 7:35 pm Post subject: CHT still high after cowling modification (jets size?) |
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Paul:
I have been wondering what is the purpose of those holes. That's something that I can easily try.
Thanks!
Jose
From: wypaul <loadout(at)bresnan.net>
To: jabiruengine-list(at)matronics.com
Sent: Wednesday, November 23, 2011 10:00 PM
Subject: Re: CHT still high after cowling modification (jets size?)
--> JabiruEngine-List message posted by: "wypaul" <loadout(at)bresnan.net (loadout(at)bresnan.net)>
Jose,
I would seal off the large holes on the inside of the cooling ducts. These appear to be about 1-1.5 inches.
Paul
--------
Paul Spackman
Q-2 Jabiru 3300
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=359076#359076
www.builde; -Ma= - The JabiruEngine-List Email Forum -amp; = &n--> [quote][b]
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dons701
Joined: 22 May 2009
Posts: 80
Location: Hershey, PA
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| Posted: Thu Nov 24, 2011 7:18 am Post subject: Re: CHT still high after cowling modification (jets size?) |
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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
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Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop |
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