---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Fri 11/25/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:26 AM - Just A Few More Days To Make Your List Contribution... (Matt Dralle) 1. 05:38 PM - Re: Re: CHT still high after cowling modification (test flight without cowling?) (Jose M. Toro) ________________________________ Message 0 _____________________________________ Time: 12:26:07 AM PST US From: Matt Dralle Subject: JabiruEngine-List: Just A Few More Days To Make Your List Contribution... There is less than a week left in this year's List Fund Raiser and only a few short days to grab one of the great Contribution Gifts available this year. Support is still significantly lagging behind last year at this point but hopefully it will pick up here towards the end. Please remember that it is solely the Contributions of List members that keeps the Lists up and running as there is no commercialism or advertising on the Matronics Lists and Forums. The List Contribution web site is secure, fast, and easy and you can use a credit card, Paypal: http://www.matronics.com/contribution Or, drop a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 I want to thank everyone that has already made a generous contribution to support the Lists! Thank you! Matt Dralle Matronics EMail List and Forum Administrator ________________________________ Message 1 _____________________________________ Time: 05:38:44 PM PST US From: "Jose M. Toro" Subject: Re: JabiruEngine-List: Re: CHT still high after cowling modification (test flight without cowling?) I'm considering to do a short flight tomorrow without cowling to verify the modified needles (main jet: 2.20-> 2.49, needle jet: 2.76-> 2.87) and to t ry to proof my theory about insufficient air going into the cooling baffels . -Is it there any reason why I should not fly without the cowling? -I was checking the Jabiru powered X-Airs (tractor without cowling), and they use the same kind of cooling baffle that I use.=0A=0AJose=0ARans S6ES/Jab 2 200=0A=0A________________________________=0A From: Jose M. Toro =0ATo: Jose Toro =0ASent: Thursday, Nov ember 24, 2011 9:51 PM=0ASubject: Fw: JabiruEngine-List: Re: CHT still high after cowling modification (jets size?)=0A =0A=0A=0A=0A----- Forwarded Mes sage -----=0AFrom: dons701 =0ATo: jabiruengine-list@ma tronics.com =0ASent: Thursday, November 24, 2011 11:18 AM=0ASubject: Jabiru Engine-List: Re: CHT still high after cowling modification (jets size?)=0A =0A=0AHi Jose.- The purpose of the holes is to bleed some cooling air ove r the front crank bearing, but you can duct tape them closed as an experime nt. I found gaps around the bottom perimeter of my ducts where air could le ak 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. =0AI remember your peak head temp being 400F. If true, tha t 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. =0ADid you pull any spark plugs for color check??=0A- It is easy to chan ge your main jet, it requires an 8mm box wrench I believe and be sure to ha ve a good magnifying glass handy to see the jet=0A number! I would not be a fraid 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 fl at washer behind the jet. It's there to prevent cavitation of air, (whirlpo ol) into fuel around jet body, supposedly. Fuel level should be close to 12 mm from the top when bowl is carefully lowered, (not easy without spilling) .=0AQuestions;=0AWhat is your peak RPM and EGT, full throttle, climb out? =0AWhat is your EGT at cruise RPM, part throttle at say around 2800RPM?=0AW hat type of temperature measurement system are you using? EIS? Single analo g, digital? Individual cylinder capability? Or group measurement?=0AMy thou ghts are, get full throttle EGT's to 1200F to 1225F.=0ACruise EGT's, if aro und 2800 or so, around 1325F.=0AOnce you get these temps under control, the demand being placed on your "cooling systems" will be greatly reduced.=0A - Hope this=0A helps....DonB=0A=0A--------=0AZenith 701 #76120=0AJabiru 2200A #2456- 95 hours=0ASensenich Wood 64-PJ-36 Prop=0A=0A=0A=0A=0ARead t his topic online here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=3 ============= ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.