What do you think?

[itsme]

Hey everyone,

I (my Dad and I) recently completed the liner for my first engine. It is my own design 2 stroke side port with a bore of 20mm, stroke of 22mm and glow plug ignition. It has 4 transfer ports, one exhaust port and the side induction port. The liner is cast iron and is going to run an aluminium piston with ring.

I have included a couple of photos of it.

[CNCadmin]

Very nice, is it for a R/C plane? Did you turn that by hand? More pics please.... how are you making the rest?

[itsme]

Hi there,

It is for a model aeroplane. The liner was turned by hand and the ports were then milled (by hand) using a 3mm endmill. The final finish on the bore was done using an aluminium lap.

The cylinder and crankcase are halfway there.

No CNC machinery used anywhere - maybe oneday.

[CNCadmin]

Very nice, what are you doing for a carb?

[itsme]

Hi there,

I've had a break on my engine for a couple of months now, but I've started building again. The conrod is now finished, the cylinder is almost done (just need to drill 4 holes), the crankcase is almost done (need to drill and tap 8 holes), the piston and liner are done, I've got the bearings and the crankshaft is halfway there (should be done in a day or so). I bought an air-bleed carb from a Thunder Tiger 40 for this engine. I just want to get a decent running engine at this stage, and seeing that the entire engine is a new design, I'd rather run it with a tested carb.

I'm now looking at piston rings. The engine is going to use a single ring, but I'm not sure of the material. I was thinking of using cast iron. It will be running in a cast iron liner and the piston is aluminium. Does this combination sound OK?

The other good news (for me anyway...), is that a CNC mill conversion is nearly underway. I'm going to finish this engine manually, but the next engine is hopefully going to have a few CNC machined parts (provided the machine is up and running). I was thinking of machining a billet crankcase and cylinder head for an OS FS91. I picked up one of these engines for £10 a couple of months ago, but the case and head are damaged. All the internal parts look good though. Those plans will have to wait a while though - I've got plenty to do in the mean time!!!

I'll try and get some pics up of the engine progress, but it may have to wait, because I'm off on holiday for 2 weeks.

Regards
Warren

[nick.gilling]

Just been looking through some old posts! Did you ever get any further with this engine Warren?

[itsme]

Hi,

Well, unfortunately I didn't ever do much more on this engine. It is still sitting around. I'm not too sure if I will ever finish this particular engine either, as there are many things I would now do (very) differently. I may still get around to using the liner from it though - I quite like the way that turned out.

Regards
Warren

[nick.gilling]

Yeah the liner look good mate.

I know what you mean. I've got an engine base plate at home, a cast flywheel that I machined along with 2 bearing pedestals in which ball races fit, then a cylinder from a small steam loco. I was originally going to make a flame gulper but it was all just off the cuff stuff, no drawings etc!

Might do something with it one day, the parts I've machined have turned out pretty well so it would be a shame to waste it completely. Might just make it into a single acting piston valve steam engine or something, that would be easier!

Like you say, I stopped and now there are a lot of things I would do differently!

[balsaman]

Starting always seems much easier then finishing....

Eric