SureFly Mag install for M20D, O-360 A1D

[Verv]

Which mag (Left or Right) needs to be replaced when swapping to SureFly electronic Mag

[47U]

9 minutes ago, Verv said:

Which mag (Left or Right) needs to be replaced when swapping to SureFly electronic Mag

Typically, the left mag has either the shower of sparks or impulse coupling, so all other things being equal (your current mag’s condition/time in service) I think replacing the left mag would be preferred.

The power connection to the SureFly is also simple, since the master switch solenoid is on the firewall just aft of the left mag.

[Ragsf15e]

49 minutes ago, Verv said:

Which mag (Left or Right) needs to be replaced when swapping to SureFly electronic Mag

You can do either, but as @47U said, replacing the left gives you benefits of a better start and you can remove your sos.

[DXB]

Definitely left - the added ease of starting if you put it on that side is spectacular.  

[EricJ]

Can you not use it for starting if you put it on the right?   In other words retain the starting magneto and also have the Surefly helping to start?    That'd be almost as good as the dual mag.

[Ragsf15e]

28 minutes ago, EricJ said:

Can you not use it for starting if you put it on the right?   In other words retain the starting magneto and also have the Surefly helping to start?    That'd be almost as good as the dual mag.

Yeah that would be awesome!  Do you need to change the wiring for that?  Doesn’t the switch ground the right mag during start?

[A64Pilot]

5 minutes ago, Ragsf15e said:

Yeah that would be awesome!  Do you need to change the wiring for that?  Doesn’t the switch ground the right mag during start?

Normally, yes.

I have never figured out why only one mag has an impulse coupling, my 1946 C-85, both mags have impulse couplings, among other things it means of course they are identical, which would seem to be a plus, but I guess impulse couplings aren’t free.

‘Knowing nothing about this installation but I assume it’s an STC? If so then your held to whatever the STC says, it may indicate which mag to replace?

[Ragsf15e]

2 minutes ago, A64Pilot said:

Normally, yes.

I have never figured out why only one mag has an impulse coupling, my 1946 C-85, both mags have impulse couplings, among other things it means of course they are identical, which would seem to be a plus, but I guess impulse couplings aren’t free.

‘Knowing nothing about this installation but I assume it’s an STC? If so then your held to whatever the STC says, it may indicate which mag to replace?

It says you can use it for either (or both now) mags.

[A64Pilot]

Just me but I don’t like SOS, I’d get rid of that, but if I had an impulse mag, I’d keep it.

Others have never had any problems with SOS and like it, so it’s a personal thing I guess

[EricJ]

16 minutes ago, Ragsf15e said:

Yeah that would be awesome!  Do you need to change the wiring for that?  Doesn’t the switch ground the right mag during start?

On many ignition switches it is a minor jumper change, or if you use something like the electroair switches you can just wire them independently and start with whatever you want.

https://www.aircraftspruce.com/catalog/elpages/ea_08-17141.php

[jetdriven]

5 hours ago, EricJ said:

Can you not use it for starting if you put it on the right?   In other words retain the starting magneto and also have the Surefly helping to start?    That'd be almost as good as the dual mag.

We do that a lot and it will fire all eight plugs. It starts up even better.