Probably a dumb question but this is the first time I’ve noticed that my oil pressure on the Dynon 120

shows 33 lbs with the engine off and hasn’t run in a day. Is it reading barometric pressure?

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How many hours on your motor? The VDO sensors don't like the vibration created by the motor and they wear out from the vibration in as little as 100 hours. Many Jabiru owners remote mount the sensor which helps them last.


663 hrs. I’ve had it for the past 200+. There’s also a sensor just below it that came from Dynon, see the pic. Both are mounted to the engine. I’ll have to go into setup to see which one the d120 is reading


Some of the senders Dynon has sold are more vibration-proof then the VDOs. I am not sure about the one in your picture. I wonder why two senders would be a good thing. I do know of a pilot that had a Dynon-supplied sender come apart in the air. When he landed, most of the engine oil was gone, much of it coated the outside of the airplane. The VDO senders work well enough if not vibrated to death. They are not expensive so you can just replace it when it quits working correctly; about every 100-200 hours.


Thanks Steve

Steve, the d120 was reading the Jabiru installed sender that always shows 35lbs,  Nick at Aeron said that was fine for a gen 2. I switched to the dynon installed sender pn 100411-002 and that shows 56 lbs. I’ve been flying N328CD for a little over 2 years and never knew. So I guess having 2 senders isn’t a bad thing. By the way when I turned on power before the change the jab sender was reading 1lb.


Some EFIS and gauges require calibration with the sender to indicate accurate pressures - it should be reading zero when the engine is off!

In my experience, the VDO senders average about 200 hrs before failure.  I highly recommend a "Swift" solid-state sender available from ACS.  It is not plug-and-play as it is not a resistance sender like the VDO, but it's not too hard to wire and calibrate.  It has no moving parts and should never wear out - mine is rock-steady.  I think it's preferable to go solid-state versus remote mounting a VDO sender as you eliminate more plumbing and possible leaks.




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