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jratcli256(at)aol.com
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 Posted: Tue Apr 18, 2006 9:59 am Post subject: In-cockpit mixture control |
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Dick C.,
My understanding about Rotax 2-cycle engines is that you should change carb jets for approx. each 1500' additional altitude you fly at. Fudge factor considered this still seems to limit your choices. I would like to be less restrained in choices to be able to avoid the ground thermals.
$180.00 doesn't seem too bad considering that a 4-stroke would run about $7500 more installed.
Steve,
Will check with Bryan for his input on this. thanks for the reference.
John Ratcliffe
jratcli256(at)aol.com
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Richard Pike
Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee
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| Posted: Tue Apr 18, 2006 1:29 pm Post subject: In-cockpit mixture control |
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A lot has to do with how rich you normally run. If your engine is
running around 1000 degrees EGT or less at the altitudes you normally
fly, you will not be happy when you start to climb. But I try and keep
my EGT's in cruise around 1100 - 1125 at 2000 MSL, and the 582 still
runs fine at 7,500' MSL.
Richard Pike
MKIII N420P (420ldPoops)
jratcli256(at)aol.com wrote:
| Quote: |
Dick C.,
My understanding about Rotax 2-cycle engines is that you should change carb jets for approx. each 1500' additional altitude you fly at. Fudge factor considered this still seems to limit your choices. I would like to be less restrained in choices to be able to avoid the ground thermals.
$180.00 doesn't seem too bad considering that a 4-stroke would run about $7500 more installed.
Steve,
Will check with Bryan for his input on this. thanks for the reference.
John Ratcliffe
jratcli256(at)aol.com
|
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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John Jung
Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA
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| Posted: Tue Apr 18, 2006 2:26 pm Post subject: Re: In-cockpit mixture control |
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| jratcli256(at)aol.com wrote: | Dick C.,
My understanding about Rotax 2-cycle engines is that you should change carb jets for approx. each 1500' additional altitude you fly at. Fudge factor considered this still seems to limit your choices. I would like to be less restrained in choices to be able to avoid the ground thermals. |
John,
I doubt that jetting will prevent you from climbing out of ground thermals in most any Kolb. Years ago, with an original Firestar and a 377, I climbed to 17,000 ASL. And I did not rejet for the flight. I was jetted to fly out of the 1,000 foot elevation field that I took off from.
I've been running stock carbs on my 503 for 9 years and I never failed to climb up over thermals, if I wanted to. Once, I was at 9,000 feet, trying to find smooth air. I had 2.5 more hours to go that day, and fighting the stick was getting me tired. Above broken clouds, I found smooth air at 12,000 ASL. No change in jetting for that either.
do not archive
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_________________
John Jung
Firestar II N6163J
Surprise, AZ |
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