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

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NickG:
S, nice work on the engine, looking really good now :thumbup:

sorveltaja:
New crankshaft is in place, some run-in on the lathe, and the engine is bit smoother now.

I've started to look at the carburetion part. Single barrel type was in my mind, but when looking at the heads, they have threads on their inlet ports.

I must have had some brainstorm again, since that way it's not possible to fasten single carb to two heads, without removing the other one.

Alternatively, heads might have just enough space for a short M2 screws, to fasten carb to heads.

Using a vapor carb could make whole thing much simpler technically. On the other hand, I never got it to work with previous test engine.

Maybe it just didn't have enough suction force. This time there is two cylinders, so I think I'll give it a shot.

Also the ignition is bit puzzling. Do twin engines have require two set of breakers, as I assume?

Piezo ignition is again an alternative, to simplify things, although it requires some grunt from the engine.

sorveltaja:
Small gear made for breakers:

It was made similar way as the aluminum one earlier, except this time I did pre-cut teeth grooves with that cutting disc, to ease the 'broaching' -process.

It meshes quite well with the bigger one. A lot better than the previous alu one, before run-in. Pure luck, or I just might be on the right track on learning how to make gears :dremel:.
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Bit of an :offtopic: addition:

The diamond cutting disc on the pic is really usable piece, as it cuts also HSS like butter. Some patience is required though.

Disc was attached to lathe chuck, and rotated at rather low rpm. HSS bit was fastened to tool holder, at the required angle.

I've never had that straight cutting angles on tools before.

Stilldrillin:
Mr S,

I grind all my drills and tools, carbide & hss, on one of those 50mm discs......

Supported by a disc of 12mm ply, it has replaced the bench grinder in my shop. :thumbup:

David D.

sorveltaja:
David, I sure hope to have that big diamond disc some day :clap:.

But in the meantime, I've started to warm the piezo ignition system idea:

Plan is to make those two piezos at the same angle, as cylinders. Big gear has some extra material on its fastening part, allowing an eccentric shaft to be machined.

Piezo elements are from gas grill/owen igniter, and need about 4mm(0.157") long push to make a spark.

Those tiny ball bearings are going to be attached to piezo's moving ends.

Before that, ignition timing gears need housing to be made.

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