Marty d's CH-701 build log

[Marty_d]

Hi Mike, yep half and half with demineralized water.

[IBob]

Marty, re the 912 oil pressure:

Originally Rotax fitted a VDO (or VDO type) sensor. These put out a voltage, but were prone to failure.
They then moved to a sensor that puts out 4-20mA, which is far more reliable.
However, you need the right gauge to go with whichever sensor you have: they are not interchangeable.

[Marty_d]

Thanks Bob.

 

Yep I have the right gauge, it just doesn't have any wires connected to it! 😄

[sfGnome]

3 hours ago, Marty_d said:

Yep I have the right gauge, it just doesn't have any wires connected to it!

Perhaps you have the new Rotax ‘Mind Reading’ gauge. It’s very reliable, because there aren’t any connections to break… 😝😁

[facthunter]

I always make a Point of pre-pressurising ANY new or "Left Sitting" motors prior to running them.  The OIL Pressure Pick up Point is a suitable Place to supply the "Forced oil" .Do it for Longer where Hydraulic Lifters are installed to ensure they are Pumped up turn the engine with one plug out of each cylinder for half a dozen turns, replace plugs and "feel" compressions.  Nev