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BobbyPaulk(at)comcast.net
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 Posted: Fri Sep 20, 2013 6:37 am Post subject: Carb Jetting |
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p { margin: 0; }List
Finally finished up the Conditional Inspection and flew yesterday. Changing out the 285 needle jet to a 290 dropped the max EGT on the hottest cylinder from 1425 to 1349 with most cylinders about 1220 to 1250. All cylinders were at or way under 300 deg. CHT. This was taken at 1200' AGL turning 2750 RPM (at) 24" MP and indicating 124 mph
Bobby ( age 75 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 188 hrs.
Do Not Archive
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jerryvmd
Joined: 18 Apr 2008
Posts: 25
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| Posted: Fri Sep 20, 2013 7:05 am Post subject: Carb Jetting |
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Bobby,
What did you get for fuel flow with the 2.90 jet. I started using that and got a higher fuel flow-over 6 GPH at cruise. Like you my EGT's and CHT are good with it.
Jerry
On 9/20/2013 10:37 AM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote:
[quote] p { margin: 0; } p { margin: 0; } List
Finally finished up the Conditional Inspection and flew yesterday. Changing out the 285 needle jet to a 290 dropped the max EGT on the hottest cylinder from 1425 to 1349 with most cylinders about 1220 to 1250. All cylinders were at or way under 300 deg. CHT. This was taken at 1200' AGL turning 2750 RPM (at) 24" MP and indicating 124 mph
Bobby ( age 75 )
[b]
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zipper
Joined: 17 Jul 2013
Posts: 14
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| Posted: Fri Sep 20, 2013 11:58 am Post subject: Carb Jetting |
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If at 1200 AGL, are you in Colorado or Florida? Makes about a 6000 foot difference. Other big question is how does the speed and fuel burn/flow change with the new jet? I expect you traded cooler EGT for slower speed and less economy. (And sooty spark plugs).
Sent from my iPhone
On Sep 20, 2013, at 9:37 AM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote:
[quote]p { margin: 0; }List
Finally finished up the Conditional Inspection and flew yesterday. Changing out the 285 needle jet to a 290 dropped the max EGT on the hottest cylinder from 1425 to 1349 with most cylinders about 1220 to 1250. All cylinders were at or way under 300 deg. CHT. This was taken at 1200' AGL turning 2750 RPM (at) 24" MP and indicating 124 mph
Bobby ( age 75 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 188 hrs.
Do Not Archive
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