Unfortunately there isn't much to update on this project. Just a few small things.
Firstly, I am going to be picking up the parts I need to start assembling the motor from Han Solo next weekend.
Secondly, last weekend I went to balance the pistons and when I weighed them they were all within 1 gram of each other so I didn't even bother touching them. I still need to balance the rods, hopefully that will be a bit more exciting.
Thirdly, I was thinking about the adjustable cam gear yesterday and how I would go about making adjustments. All the after-market gears have a degree scale etched into them, but I don't have the tools to do that. I thought about just printing a scale that I could just laminate and glue on and use with the existing timing line on the gear, yeah kind of ghetto but it would work. Then I thought about how pretty much all mechanical timing adjustments rely on the accuracy of the eye of the person making the adjustment. I figured it’d be nice if there was a quick, easy, and above all fool proof way to make timing adjustments. I came up with this concept…
At this point you might be wondering what those extra holes are for. Looking at the timing gear I figured that the manufacturing tolerance of the gear was at least as good as (or better) than the accuracy of the human eye so why not use the physical geometry of the gear to dictate the timing adjustment. Obviously when I go to machine the gear I will verify if my assumption was acceptable or not. This picture will give you a better idea of what is going on…
As you can see, my idea was to use the spokes of the timing gear to adjust timing. The holes in the plate will be reamed to 6mm to have a nice snug fit for a 6mm dowel pin. That way I will be able to insert a dowel pin into a hole, loosen the screws around the outside and rotate the gear until the dowel pin contacts the spoke. One spoke is used to set the orientation of the gear back to stock timing and the other spokes can advance or retard the timing 1 degree per spoke. So this layout gives me +/- 5 degrees of timing adjustment, however the holes could be revised to give any combination of advance and retard. Hopefully it works!
That’s all for now folks!