Oooooo,
This is like Primer Wars - Most Excellent !
Here is why I ran mine and what we did.
My workshop is in my garden and is fully equipped - the airfield is 30 miles away and is just that - a hangar and a strip.
My motor was a brand new, test cell run, inhibited ECI IO-360 assembled by Mattituck.
Apart from assembly, we thought the aeroplane was ready to fly.
I wanted to ensure that the basics were OK before we went to the strip and were detached from tools, plans, facilities - oh, and a good heater !
The aeroplane was weighted down, had no empennage on, was securely tied to a 6" gatepost and chocked.
Firstly, the inhibitor oil was flushed by putting 4 quarts of fresh low weight oil in and spinning the prop over by hand without plugs in. The oil was drained and fresh put in. That raised a sweat !
A gallon can of fuel was plumbed in and secured to the left hand wing root.
My Bro and I discussed what we were trying to achieve, we had set signals and 2 fire extinguishers on hand with a third person on the other side for safety.
The engine started on the third blade.
It ran at around 800rpm for a minute or so - leak checks OK, Oil pressure OK, electrics checked, systems powered up and checked. I ran it up to to 1200 and checked the mags - 1 side was dead.
Hmm......
Stop, think, 3rd man now underneath checking for leaks, things dropped off etc.
Started again - same.
No operations over 1200 rpm.
OK - back in the shop, pleased with everything apart from mag dead.
We changed our ignition from LASAR to P Mags during the progression of the build and had installed P Mags on both sides.
In the warmth and comfort of the workshop, we could now fault find and went carefully through the install, retimed the mags and was about to take it out again when it struck me.
Why was the left mag set back from the case so much ?
Yep - impulse spacer was still in
30 minutes later we were outside, part deux.
Started, ran, pressures checked, mags checked - STOP.
That was it - we function checked and systems checked everything in the comfort and safety of our workshop rather than on a cold and remote hangar.
It worked for us, safety was paramount, a plan was in place and a structure to what we wanted to achieve. Yes, there was video but that was by an unattached independent.
I reported this years ago when we did it and got flamed and applauded so you will never win.
Choose your own path and BE CAREFUL !!