If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#21
|
|||
|
|||
leaning in climb
Actually, on most of the lycomings it's not necessary to screw with this
at all. Set the best power during your run up (at your magcheck rpm). Climb at Wide Open Throttle. WOT lready adds extra fuel to maintain engine cooling. Some of Lyc's specifications result in really rich running engines. We have a 182RG that has an HA-4 carb, and it runs very rich at most power settings when the mixture is full forward. The Precision Aeromotive guys (former Marvel Schebler) tell me that this is the way Lycoming specified the carb when they designed that particular engine model (O-540J3C5D), and that you have to get used to playing with the mixture much more than you did with a 172. We lean while idling on the ground, full rich for takeoff unless above 3000' DA (as per POH), and you have to lean it in the climb if you want it to run smoothly and not smoke. When carb heat is applied in the circuit, it gets pretty rough unless it's leaned again. Our airport is at 2975' ASL. We get lots of leaning practice. Dan |
#22
|
|||
|
|||
leaning in climb
Thomas Borchert wrote:
Jay, to an over-lean condition Wazzat? That would be if the engine is backfiring ;-) Personally, I simply lean a fixed-pitch prop Lyc to find peak rpm and have never had any performance or maintenance issues in nearly a decade of flying. The engine always seems happy and I suspect that at peak rpm, I'm probably still blowing a significant amount of unburned fuel out the exhaust pipe. In those planes I've flown that were equipped with cht guage, the temps never climbed high enough to be worrisome either. |
#23
|
|||
|
|||
leaning in climb
On Tue, 15 Nov 2005 13:02:57 GMT, "Matt" wrote:
Hi everyone. I have a leaning question. The POH for my 152 says that the mixture should be leaned to best power after passing 3000 feet in the climb. However in other places in the POH (and the Lycoming site) they say not to lean when at 75% power or higher in cruise. My question: Is the engine developing less than 75% power during the climb; and is this why leaning in the climb is OK? Does this guidance in the POH seem contradictory to anyone except me? Thanks for all your help. Matt I don't think anybody has mentioned the following information, from Lycoming, which may be useful: http://www.lycoming.textron.com/supp...ns/SI1094D.pdf |
#24
|
|||
|
|||
leaning in climb
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Leaning for taxi | Jim Rosinski | Piloting | 28 | September 12th 04 03:53 AM |
Angle of climb at Vx and glide angle when "overweight": five questions | Koopas Ly | Piloting | 16 | November 29th 03 10:01 PM |
Second Stage Climb Gradient? | Bill | Instrument Flight Rules | 10 | September 15th 03 06:41 PM |
Second Stage Climb Gradient? | Bill | Piloting | 10 | September 15th 03 06:41 PM |
More About Leaning During Climb | Dan Luke | Owning | 13 | July 11th 03 02:36 PM |