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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)
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| Subject: | Just A Few More Days To Make Your List Contribution... |
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| Subject: | 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 <jose_m_tor
o@yahoo.com>=0ATo: Jose Toro <jose_m_toro@yahoo.com> =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 <burdon1@comcast.net>=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
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