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Agree on the rcxel, I'm setting up the Lv uneven fire 90deg on my vtwin

Well, got the cam made. used the mill, and happy with the results, EXCEPT i've got the cylinder 2 lobes at the wrong angles. 😢😭 Not a machining error, a drawing error...so thats for the junk bin, and start again. Fortunately have just enough silver steel for another go

Heres the part drawn up now. Lets hope I've got the lobe angles right.

Here's a bit on the cam profiles. I've been using a "Cam with draw" excel spreadsheet that someone has very nicely shared, to work out a cam profile. I have drawn this in cad to work out the crank to cam relationships. So I have a total working angle of 135° for each lobe. The exhaust leads...

Thanks Spotter. Not sure if I will release the drawings, some of which are a bit of a mess now. Also i'd want to make sure it actually works first :)

Well it feels like an age since of worked on this. Think I lost a bit of interest and needed to work on other things. But there is not actually that much more to get this finished and so hope to get this finished over the next few months. Today I did some heat treatment of silver steel parts...

Thanks Brian, I only use Inventor as I have access to it through my work (although I understand it can also be downloaded freely for hobby use). I have also been playing with Fusion, which is similar in approach to Inventor. I have been using it to design parts for my RC plane and then cut out...

Hi, I am not sure yet. I need to get it working first. Not too much more to do. Cam shaft and rings.

sorry, it has been a while since I posted. Have made some further progress. Pistons, gudgeon pins done. Crankshaft (EN16) done. Was waiting for the pulley and gear until I designed the tensioner. Seems to work ok Another part I was waiting for was the carb. After a lot of deliberation...

something like this....hopefully.

Thanks John. I made the first piston yesterday and it made me realise how big the thing really is. :)

Thanks Peter. 45 years!, I've been flying and model engineering for about 4 years, a long way to catch up

Thanks, yes the plane is from my own plans also, however the style of design is not mine. The original is by the Gratner Brothers. I just loved the look of it so much I wanted one. Mine is not going to have the wood vaneer, but will be more classic racing red style.

superb

today I got the rear crank done. Found it really difficult to get a good finish on the EN16 Also got the first piston sleeve done from Cast Iron, much easier to machine. Made an error by rushing and gouged a mark withdrawing the work piece. Fortunately it'll be well below the piston rings so...

Thanks Mauro, that should be fairly easy to calculate. I'll try that.

Hi all, Anyone have any thoughts on the best way to select valve springs for 4 stroke gas engine. Its my own design 100cc and I have the valve lift determined, but not sure how to assess the required spring compression strength required. On my previous smaller engines I have made by trial and...

close, it's actually Bruce Willis. I downloaded the file and 3D printed him

Thanks Bruski. Plans are pretty much finished, but wouldn't like to release until I have finished mine and get it running. I occasionally find bits when I am machining that I need to make alterations to on the drawings.

my version of the Riley Model B. 100" wingspan