poppin engine started and stopped!!!

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NickG:
Jim,

:bugeye: Wow you've made a lot of progress -nearly there and sounds promising. :thumbup:

Thanks - it's nice to know my engine inspired someone!

I'll won't take my eyes off this one, should be a little cracker.

Nick

NickG:
Jim,

Can I ask how you milled the frame? The instructions suggest keeping the stock longer and milling it on it's side, which is how the radii are formed, but I would be more comfortable milling with it upright if you understand what I mean, which would produce square corners.

Nick

jim:
Nick,

first thing i did on the frame was to dill two holes, with it on its side, to give the rads.

next i milled the slot to blend in to the rads at the sides and bottom.

i then milled the part the crank goes into. once i'd got the sides to size, i drilled the pinch bolt holes for the crank bearings.

next was to flip it on its side and drill/bore to suit the bearings. once that was done i milled the slot that allows the crank to pass through.

next time, i'm going to take photos!

NickG:
Jim,

That sounds like a better method. Think i'll do it your way. I wanted to put a ball race on the big end as well, did you loctite your crank together? I can see it's pinned too, I was worried about the loctite getting into the bearing for the big end if I did that!

Nick

madjackghengis:
Hi Nick and Jim,
I've been following your threads because I built a small flame gulper years ago that I never did get running, and while I made many changes and fixes, including some that made a difference in its reactions, never enough to get it to even turn over once on its own. I intend to return to a flame gulper when I am done with my current radial, and I'm interested in the "poppin" design, rather than go back to the one I didn't get running. Can you tell me where to get the plans for it? With regard to material, cast iron is among the easiest to scrounge, at least here in the states. A good source of fair quality cast iron in scrap is an old lawn mower engine, using the crank for shafting, and various lumps for what they are a good size for. Iron plates from weight lifting machines, or even new bar bells can be decent cast iron and useful, as well as being fairly large chunks.
It looks like you're on the way to a successful engine build, and just a few bits of work away from showing it off, Jim, looking forward to it running.
mad jack

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