I have just got my Jan ridders DEBBIE running easy to start and run on model engine glow plug fuel and a spray bar fitted. https://youtu.be/KpeuXRtJy5IWhat is the simplest IC engine that can be built from stock and how difficult is it to bulid and get running? Have seen Jan ridders simple two stroke but some people say its hard to get going.
Mate of mine is retired secondary school manual arts teacher ( tech drawing, metal and woodworking) In his time at a local high school he designed, built and made available to a class of kids each year to build a single cylinder 4 stroke engine. Not from extrusions but from a set of castings he made.Thanks for replys, i do have machines cnc and manual, i have built Jan Ridders twin cyl vacuum engine with internal valves and am trying to get it going at the moment but not sure if it will go :-\. I have no experience with an IC engine and was just woundering if it would be possible for me.
Do you have plans for this engine that can be shared? I'd be interested in maybe keeping your mate's legacy going and having a go at building one, possibly even casting the relevant bits if it's not too complicated. All I ever built in manual arts was a brass 'sprinkler' from a bit of 3/4" bar and a short length of steel rod...Mate of mine is retired secondary school manual arts teacher ... I have some castings here somewhere so maybe get a photo for you. Note that design also allows for a "built-up" crankcase if you so desire.
There's quite a few different techniques around. For me, I cut the valve stem down in sections around 8-10mm long to reduce deflection, til the whole stem is around 0.01 - 0.02mm oversize, then finish to size with wet and dry. Then I cut the angle on the head at 45 degrees (or somewhere close is good enough) and part the valve off with at least an inch-or-so extra material on the head end, as a handle to hold on to for lapping. Repeat for however many valves you need, plus a spare or two, and another to become the seat cutter - this one with at least a couple of inches extra material. Doing them all without changing setup in the lathe is critical to keep all angles the same.Does anyone have a primer on how to properly make and seat poppets?