V-twin engine from scratch - yet another interpretation of how (not) to build a

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sorveltaja:
Madjack, I've done some research, of what pourable ceramic materials could possibly be used for insulator.

Some of the bonding pairs, that are possible candidates:

Porcelain/metal - Porcelain seems to require a long term heat treatment on its own, using a high temperature oven.

Glass/metal - Very unstable, and may well require some special techniques to achieve, as I have experienced, during the past Lamina -engine phase.
I destroyed a whole lot of test tubes, while trying that.

Enamel - I guess, that it's basically glass, and coloured one contain some metals.

One non-ceramic substance could be a high-temperature paint. Not sure about the dielectricity of those.

sorveltaja:
Intake adapters in place:

Both will have two holes drilled and tapped for an M2 screws. What comes to carburetor, I think I'll use the test engine's one, as it works to some extent.

Next thing to do, is to make a manifold. It will most probably contain two brass tubes.

Anyways, I also got the second spark plug finished.

sorveltaja:
Intake adapters drilled and tapped. Two parts on lower side after silver soldering:

Those two part's tubes need to be morphed somehow together, to form a manifold.

They need some bending first, and if any success, they are fastened in place, and final fitting can take a place.

This an unknown territory for me, as this is my first more-than-one-cylinder -engine, that's in progress.

Anyways, I'm prepared to boldly go where no man has gone before that, and lengthy filing session(s).

madjackghengis:
Hi Sorveltaja, if I end up making plugs, I will probably try to duplicate comercial ones, with a ceramic center tube, with shoulders, fired around the center electrode, steel ends much as you've made, and a copper o-ring to seal between the ceramic, and the steel, with the seal formed by rolling over the edge of the steel compressing the copper o-ring. I've taken apart a couple dozen plugs, and that is essentially how they are all made with minor differences. With regard to your intake manifold, having dealt with many of the shape you need on Harleys, I would suggest filling the tubes with cerrro-safe, or some similar low temp melting metal, bend each tube while bolted in place without the other, so you can get the centerline of each tube basically centered, then melt out the supporting metal, do your last little pushing and the like, and cut the two tubes so they meet each other, cut a bit large, and file down to a good match, tack solder them in place, and finish soldering them off the engine, so the heat expansion doesn't leave you with too short between the cylinders. That's how I've done it with custom manifolds for Harleys, with about an inch and three quarters port diameter, and tigging up aluminum parts. I hope this helps, if not, I expect you'll figure out a way that works. :headbang: mad jack

sorveltaja:
Mad jack, thanks for the tips :thumbup:.

Ceramic-based materials are undoubtedly best for the spark plug insulator, but machinable ones seem to be rather expensive.

Then again, more traditional porcelain would require a 'glazing', to give it a glass-like surface, similar to that of coffee cups.

Inlet tubes formed so far:

I'm not sure yet, what the next step is, but I guess that I'll find that out before long :med:.

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