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Isn't it located on the side of the head on those engines? I also looked but didn't see any plug holes, certainly not in the customary spot on the top of the head. Holes in the side wouldn't show in the posted pics I don't think. Then again, Brian may not have made those holes yet. To...

Both yours and Sids comments on the spark plug hole are excellent BUT did Brian already machine the spark plug hole? If he did, I highly doubt he would remake the heads. The rocker post is another matter.

The build is looking great so far ! Nice work !

There are excellent tutorials on youtube teaching the advanced features of solidworks. I used it heavily in building a gatling gun I recently designed and built. Using the animation features I was able to "operate" everything on screen before cutting metal. It sure saved a ton of issues...

I researched Oatley product #48319 out of curiosity. In the Q and A section Oatley responded that the silver content is less than 2% for that product. https://www.rona.ca/en/product/oatey-silver-solder-kit-483191-1120099

Might want to look again and recheck those scribe lines on the left hand piece before cutting !

Just a guess.... but..... L is the standard abbreviation for a inductor in electronics. Rather than a capacitor discharging I am guessing it works on "inductive kick" principle using a inductor.

Is there any chance your test fixture is spinning the engine the wrong direction?

The pushrods on the rear cylinder (furthermost from the flywheel) look to be bent near the rockers when zooming in on the picture. Is this just a illusion from the camera view?

appears to be separationin degrees between intake and exhaust cam lobe centers. Also, the lobes lobes for the two cylinders appear to be identically in line, that is the intake/exhaust timing is identical for both cylinders.

A normal human can blow a balloon up much faster than in that video AND a human can only generate about 2PSI !!! In short, totally worthless test. 2PSI ain't going to get a engine to run !

So, try it on a known good engine that runs, see what it reads. That will confirm/condemn the test setup.

Does not appear to be one in his leak down test setup. Possibly there is one (brass) at the cylinder head but if so it is in the wrong location for leak down tests.

You have the line from your compressor disconnected when watching for leaking down, right? Otherwise the regulator is doing exactly what it is intended to do, hold pressure at 60psi regardless of the airflow. As a test, hold a valve open during your leak down test, does the gauge drop to zero?

I made a set of helical gears for my gatling gun build using Gearotic Motion software on my cnc mill. First time using gearotic and first try the gears came out great. Made with just a 1/16 straight endmill. I believe there is a free trial version. I am a hack compared to your beautiful...

Runs very nice ! Congratulations on your excellent work and results.

Thank you for posting all those pics of how you made the valves and cages ! Pics can fool the eye, what size are the valve stems and heads? To me, it looks like the test setup does not test leakage between the valve stems and the cages, am I correct? Are stem seals of some sort planned...

Harley motorcycles use dual output coils too. Onan twin engines and their generators also use dual output coils. Just a couple more sources. You don't still have the coil from the engine you built 10 years ago?

Strictly IC magazine had a huge selection of different engine build articles and plans over the many years it was published. I don't know if back issues are available anywhere or not. I have every issue ever printed, really lucked out and got them from a local fellow for $40 !!!

What kind of alcohol? There are 3 common ones, methyl, isopropanol and ethanol. Each has different burn characteristics. Considering you got yours from a drug store I assume its isopropanol (aka rubbing alcohol).