Big stroke 55 cc one cylinder ICE

Hello, this is my building log of first and own design combustion engine. For several months I am busy with building of the engine.

My goal is to make the engine block as solid as possible. So that is one of the reasons that it is big stroker. The engine should have the possibilities to be able to easily adjust.

The swept-volume is 55 cc, with a boring of 39 mm and 46 mm stroke. I want it to run at low to mid range. So let's say 750-3000 rpm.
Intake valve diameter 18 mm with a max lift of 4.5 mm, exhaust valve diameter 14 mm and a max lift of 3.5 mm.
One camshaft fitted two cams that are adjustable. The duration of the cams would be around 200 degrees, I have to go into this further.

I want to make most of the parts by myself. But given that this is my first engine, I also use existing components. Such as piston, valve springs and a spark plug.


Feel free to give comments!

First I had to turn a new flange to mount a four claw chuck for my lathe. With my current three-claw I can not turn large diameters of rod material.

Start building with some raw material. First part, crankshaft crank cheeks.

Cylinder head. I try to upload photos chronologically as possible, but as wel all of one part.

The diameter for the valve seat of the inlet has unfortunately been larger to 20 mm. Due to a measurement error (x-as movement).

Cylinder

Drill holes for mounting on cylinder head and crankcase.

By my engine building standards Alex that's one big engine - ten times bigger in fact 

That's some nice machining you are doing there - I'll look forward to seeing it progress in coming days

Regards - Tug

Thank you Tug, yeah the reason I want to make a bigger one is the diameter of a standard piston. And the ability to use some larger parts for valve stems etc (round 5 mm). The photos that now are uploaded are from a month of two ago. Recently I had solder the exhaust valve.

I want to upload more, but for some reason it didn't work. Maybe I had to wait some time

Looks an interesting engine. I'm following along too   Keep posting.    Regards      Terry

Also following your progress Alex.  Nice documentation of the parts so far.

Bill

Interesting Build! Keep the pictures comig 

Plani

Connecting rod and small-end assembly. I had the idea to fit a 15 mm outside diameter for the small-end bearing. But unfortunately there are no 15 mm drill or cutter.

Because of that, I have made a part of material C45 to fit the bearing.

First (rough) work on the carter. Plates  are 6 mm. The squired profiles are 20x20. On the left and right side there would be a plate of polycarbonate, to look inside the engine (if you can see something with running the engine full of oil .

An interesting build  Larger than I can do with my machines. There is a lot of experimentation possible with camshafts, valves etc.