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BobbyPaulk(at)comcast.net
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 Posted: Mon Jun 20, 2011 10:49 am Post subject: 93 Octane |
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p { margin: 0; }List,
I have been burning 93 Oct. BP No- ethanol ( It's the same blend as the old Amoco White ) for most of my 119 hrs. I have found it to burn slightly cooler than 100 LL. and the CHT's are more equal. I have experimented with the Ram Air duct and changed jets in the Bing until I can no longer better the situation. The CHT's at low cruise ( under 2500 rpm 19" ) is #6 about 310 ~ 315 and the rest under 300 with #2 running about 250 deg. At high cruise ( 26" ) & above 2750 I can get about the same but it is too fast for rough air ( over 130 mph ). Anywhere in between 2500 and 2700 the CHT's will climb too high for comfort ( 330 ~ 340 ) on some cylinders. It runs too lean between 2500 and 2700 RPM. EGT goes up immediately and CHT follows.
I have the lean needle and the newer black floats.
Has anyone played with changing the taper on the needle and how would you determine how far down from the diaphragm would be in the 2500 ~ 2700 rpm range.
Bobby ( age 73 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 119 hrs.
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dons701
Joined: 22 May 2009
Posts: 80
Location: Hershey, PA
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| Posted: Mon Jun 20, 2011 9:20 pm Post subject: Re: 93 Octane |
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Bobby, Did you try raising the needle by placing the clip in one the lower notches in the needle? When you say "I have experimented with the Ram Air duct", what did you do?....Don B
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop |
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