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aprazer
Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho
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 Posted: Mon Nov 17, 2008 1:05 pm Post subject: Fluctuating tachometer readings |
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Scenerio: 3300 Jabiru; Dynon DK180; Pulse/Revolution values are set (at) 6; tach wired to alternator with 1 amp fuse; Problem fluctuating tach readings on taxi testing.
Readings: At idle 2000+/- RPM -- hand held tack shows 1050+/- 10;
As I add throttle Dynon RPM drops to 1600;
Slowly adding more power tach reading comes up then drops until it reaches full throttle and reads 2300 (static should be 2800).
Has anyone had this problem? If so, how did you solve it? Any and all help will be greatly appreciated!
Thanks,
Mack Kreizenbeck
601XL N990MK
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pete(at)usjabiru.com
Guest
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| Posted: Mon Nov 17, 2008 2:48 pm Post subject: Fluctuating tachometer readings |
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Your Dynon is picking up stray signals from other wiring. Typical sources
are CHT or EGT wires. A fuel pressure sender is also a good source of stray
signal if located too close to the distributor.
Another possibility is a bad fuse with increased resistance. Try running
without the fuse.
Pete
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