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I've done something right!!! Now I am getting spark from both plugs. Jason, this is very much the "fiddly bits" of building an engine. Every time I have that distributor rotor off and then back on, I turn the engine over by hand until I know things are going to clear okay. It is a very close fit...

Gahhhh---Now I have spark on the left hand plug, no spark on the right hand plug!!

Rotor is not turning because camshaft gear set screws have come loose. Camshaft gear is turning but not camshaft.---Poop!!! Now to re-set the cam timing and tighten up the cam gear set screws.

With distributor cap removed, I see that the rotor is not turning. Not sure why yet, but that rotor has to turn with the camshaft.

Second test has been performed with all sparkplug and coil leads going to the correct terminals. Getting lots of spark on the right hand plug, none on the left hand plug. Next step will be to pull the distributor cap off and see whats happening in there.

First test today--I had to go down to the auto wreckers and buy a longer coil wire. With the ignition switch "on", and a test sparkplug laying out on the starter table I turned the engine over using my starting table and yes, I had lots of spark at the plug. Next step will be routing the spark...

That is exactly why I am considering casting my own sparkplug boots. The cost of the boots is insignificant. The cost of the shipping kills---And remember--$17 USA funds is $24 Canadian funds.---Brian

Mechanically, my engine is finished. It's taken a long time, because I stopped part way thru the build to build/buy/assemble my powder paint set up and my sandblaster set-up. Today I hooked up the electrics to the engine, and all I can say at this point is that the points are opening and I'm...

Werowance--there is something that looks like a coil spring up inside the boot that makes contact with the end of the sparkplug. my best bet is to refer you to this post.---Brian https://www.homemodelenginemachinist.com/threads/three-piece-mold-for-sparkplug-boots.36494/

This morning my sparkplug wire assemblies came in from Roy Sholl. Every time I build an engine I swear that I'm going to make up a die set and cast my own sparkplug boots---and every time I end up ordering a set from Roy.

I'm always afraid they won't start---right up until they do. Waiting on plug wires from Roy right now.

Sid----Piss off!!!

Question of the day---What do you call this particular sort of spring clamp and where can I buy it to fit 1/4" and 3/8" gas lines. Preferably in Canada.

I use Solidworks all the time when figuring out valve timing. I don't post about using it because there is nothing to see unless you have the program.

After thinking about cam timing all day, I finally went back to the posts I made about about cam timing back when I first designed and built my opposed cylinder twin engine from about 5 years ago. Surprise!!!---the 102 degrees cam lobe separation was there on a drawing ---the same number given...

Alright--I'm convinced. I will set up for the intake cam to begin lifting the tappet at 5 degrees before the piston reaches top dead center. Not much got done yesterday because it was Thanksgiving feast day at my house.

I just received this email from R Klopp, who successfully built and ran six (not eight) of these Upshur opposed engines. Hi Brian I based my Upshur valve timing on the Wyvern design and came up with these numbers: Wyvern timing (based on crank angle) is reportedly as follows: Inlet: 230º...

Okay, I'm almost ready to rock and roll!!! I still have to source some very small hose clamps to go on my flexible intake lines and still have to receive a pair of sparkplug wires from an outside supplier. As far as my cam/valve timing is concerned, I'm going to set things up so that the intake...

As shown in post 351, the cam duration is 96.3 degrees. On other engines I have built, the cam begins to influence the intake valve 15 degrees before the piston reaches top dead center and stops influencing the intake valve when the piston is 45 degrees past bottom dead center.---This is of...

Yes, the drawing is to scale. Perspective is weird sometimes.