Multi engine tuning..
08-06-2009 | 12:43 PM
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From: East Providence, RI
Multi engine tuning..
Is it normal for a twin to have one engine richer/leaner then the other?
I ask because on my 310 engine #1 is about 3/8's of a turn leaner on the high end. I did this to get them in sync.
I would imagine this is normal due to the inherent differences between two engines. Must be highly unlikely to receive two brand new engines that run exactly the same..Correct?
Pete
I ask because on my 310 engine #1 is about 3/8's of a turn leaner on the high end. I did this to get them in sync.
I would imagine this is normal due to the inherent differences between two engines. Must be highly unlikely to receive two brand new engines that run exactly the same..Correct?
Pete
08-06-2009 | 12:48 PM
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From: Colorado Springs, CO
RE: Multi engine tuning..
Hi
Due manufacturing tolerances, that engine maybe the same. The best way too tune twins is to do each engine by itself. Start one, tune it, then turn it off. Do the same for the other one. When both tuned, start and fly. Dont try to tune engines to each other, that will cause problems.
Vince
Due manufacturing tolerances, that engine maybe the same. The best way too tune twins is to do each engine by itself. Start one, tune it, then turn it off. Do the same for the other one. When both tuned, start and fly. Dont try to tune engines to each other, that will cause problems.
Vince
08-06-2009 | 01:00 PM
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From: East Providence, RI
RE: Multi engine tuning..
ORIGINAL: vpresley
Hi
Due manufacturing tolerances, that engine maybe the same. The best way too tune twins is to do each engine by itself. Start one, tune it, then turn it off. Do the same for the other one. When both tuned, start and fly. Dont try to tune engines to each other, that will cause problems.
Vince
Hi
Due manufacturing tolerances, that engine maybe the same. The best way too tune twins is to do each engine by itself. Start one, tune it, then turn it off. Do the same for the other one. When both tuned, start and fly. Dont try to tune engines to each other, that will cause problems.
Vince
BTW your avatar is disturbing
Pete
08-06-2009 | 04:27 PM
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From: Laurel, MD,
RE: Multi engine tuning..
Just to agree with Vince, set the mixture on the two engines one at a time, with only one engine running.
If you want to synch the RPM of the engines, do it with the throttle setting and a computer radio, with each engine on a different channel, or use an electronic synch device.
Personally, I don't worry about the peak RPM being different (and it is on my Mossie by quite a bit), but I used my JR 9303 twin engine feature and a pair of tachs to set up the idle and midrange so they track (mostly) together as I bring up power. It helped with the takeoff roll.
If you want to synch the RPM of the engines, do it with the throttle setting and a computer radio, with each engine on a different channel, or use an electronic synch device.
Personally, I don't worry about the peak RPM being different (and it is on my Mossie by quite a bit), but I used my JR 9303 twin engine feature and a pair of tachs to set up the idle and midrange so they track (mostly) together as I bring up power. It helped with the takeoff roll.
