Air Bleed Adjustment LA 46
10-06-2002, 02:19 PM
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Air Bleed Adjustment LA 46
Can anyone tell me what the base-line setting for the air bleed screw on an OS LA 46 is? One of the local "experts" told me you opened it up inserted a straight pin, then turned the air bleed screw in untill it cotacted the straigt pin. It seemed a little arbitrary to me, but he has 27 years experience and I'm working on week 2.
Now when we fly the plane (Eagle II) it still seems to sag, in what I'm told is a lean condition about halfway through a tank of fuel, even with what I think is a way too rich needle-valve setting. I've got about 8 flights on the engine, plus a couple of tanks run through on the ground, so I'm assuming the engine should be getting towards being broken in. There are a couple of LT-40's at our field, one with a TT Pro 40 , and one with a TT Pro 46, and they just sing! My engine will hardly pull me over the top of a loop!
I want to get back to base-line settings and tune it as per the owner's manual and see if I can get it sorted out.
Thanks in advance!
Now when we fly the plane (Eagle II) it still seems to sag, in what I'm told is a lean condition about halfway through a tank of fuel, even with what I think is a way too rich needle-valve setting. I've got about 8 flights on the engine, plus a couple of tanks run through on the ground, so I'm assuming the engine should be getting towards being broken in. There are a couple of LT-40's at our field, one with a TT Pro 40 , and one with a TT Pro 46, and they just sing! My engine will hardly pull me over the top of a loop!
I want to get back to base-line settings and tune it as per the owner's manual and see if I can get it sorted out.
Thanks in advance!
10-06-2002, 03:27 PM
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Air Bleed Adjustment LA 46
David..
.40LA is a rather simple engine.. using the pin is a good way to set air bleed, yes.. I have a few of these motors and recently ran into a problem with one which was reasonably corrected..
Remove motor and make damn sure cap on back of motor is screwed on tightly ..
A help to an LA making a little more power is to open up muffler
and remove the baffle.. It is a small 'funnel' shaped restrictor in
side of muffler.. Removing it will not cause a loss of fuel pressure..
However, make SURE pressure line IS open <nipple> and that the
vent tube in tank is unobstructed, i.e., hitting top of tank..
These engine are not as powerfull as a TT Pro, but they should fly a five to seven pound plane around well..
Also, if you use a 10X6 APC prop it will do better..
Robby
.40LA is a rather simple engine.. using the pin is a good way to set air bleed, yes.. I have a few of these motors and recently ran into a problem with one which was reasonably corrected..
Remove motor and make damn sure cap on back of motor is screwed on tightly ..
A help to an LA making a little more power is to open up muffler
and remove the baffle.. It is a small 'funnel' shaped restrictor in
side of muffler.. Removing it will not cause a loss of fuel pressure..
However, make SURE pressure line IS open <nipple> and that the
vent tube in tank is unobstructed, i.e., hitting top of tank..
These engine are not as powerfull as a TT Pro, but they should fly a five to seven pound plane around well..
Also, if you use a 10X6 APC prop it will do better..
Robby
10-08-2002, 07:30 PM
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Air Bleed Adjustment LA 46
David,
We set the air-bleed screw so that it blocks 1/2 of the hole. It gets adjusted from there once we've gotten the high-speed needle set correctly.
We hope you find this information helpful. Should you have any further questions or concerns, please do not hesitate to contact us at this email address. (Please be sure to copy all previous emails into any future questions.)
DID YOU KNOW that our web pages now all contain FAQs? (Frequently asked questions) Please drop by and take a look! We hope you'll find the information helpful and valuable to you.
Sincerely,
Bill Baxter, Manager
Hobby Services
1610 Interstate Dr.
Champaign, IL 61822
USA
Phone: 217 398-0007
Fax: 217 398-7721
Email: [email protected]
Web: http://www.bestrc.com
We set the air-bleed screw so that it blocks 1/2 of the hole. It gets adjusted from there once we've gotten the high-speed needle set correctly.
We hope you find this information helpful. Should you have any further questions or concerns, please do not hesitate to contact us at this email address. (Please be sure to copy all previous emails into any future questions.)
DID YOU KNOW that our web pages now all contain FAQs? (Frequently asked questions) Please drop by and take a look! We hope you'll find the information helpful and valuable to you.
Sincerely,
Bill Baxter, Manager
Hobby Services
1610 Interstate Dr.
Champaign, IL 61822
USA
Phone: 217 398-0007
Fax: 217 398-7721
Email: [email protected]
Web: http://www.bestrc.com
