Vdo tacho adjustment.

[BrendAn]

I have fitted a tacho from a j160 and pickup sender. It is bouncing all over the place.

Wondering if anyone has experience with setting these tachs up.

Apparently there are 3 configurations for different flywheels. 

 

 

[JabiruWeekendWarrior]

What pick up is on the engine, original one or the newer hall effect used on Gen 4s?

[BrendAn]

22 minutes ago, JabiruWeekendWarrior said:

What pick up is on the engine, original one or the newer hall effect used on Gen 4s?

inductive pick up. red and black wires. the old pickup had orange and black wires. i had to change them to get the tacho to work. chris at jabiru said that might happen.  no idea what gen motor was in the j160 the tacho came out of.  i thought inductive are the same thing, is that correct.

Edited 18 hours ago by BrendAn

[kgwilson]

When I built my aircraft (2014) I routed the VDO tacho wires in the same loom as most of the others and had a similar problem as they were getting induction current from the others. The wires should be in a twisted pair and kept away from others as far as I can recall. You could use shielded wires as an alternative. Anyway by separating them the tacho has functioned perfectly since I did that.

[BrendAn]

18 minutes ago, kgwilson said:

When I built my aircraft (2014) I routed the VDO tacho wires in the same loom as most of the others and had a similar problem as they were getting induction current from the others. The wires should be in a twisted pair and kept away from others as far as I can recall. You could use shielded wires as an alternative. Anyway by separating them the tacho has functioned perfectly since I did that.

The wires do run along a loom so that's something to look at.  Thanks kg. Another thing I need to look up what the air gap should be for the pickup.