Last autumn I gathered up the drawings, magazine articles and castings for a 1/4 scale Anzani 3-cylinder radial model (aka Y-type). The castings consisted of crankcase halves, rear cover, carburetor and intake pipe elbows. Everything else is bar stock. Yes, that includes the cylinders. They are an integrated head/cylinder design carved out of cast iron. (I don't even want to think about how many turns I gave the rotary table handle over the course of that little exercise!)
I got it running last weekend after a few more degrees of advance on the ignition timing. I don't know the rpm but it's probably close to 3000 at wide-open-throttle on the (oversize?) 22-10 propeller. It uses a plunger style oil pump driven from a cam on the rear gear train that creates much more pressure than I'd envisioned or hoped for. I've been backing off the oil pressure relief valve every run but still see 40/50 psi at speed. As a result one doesn't want to be wearing "Sunday finest" around this engine when running yet.
All in all, a satisfying project. It has very strong compression and starts easily from cold - 2 flips usually.
Here are few photos from along the way.
Ignition distributor ...
Carburetor ...
Cylinders ...
Crankshaft and connecting rods ...
On the stand ...
Finally - proof it does indeed run ...
I got it running last weekend after a few more degrees of advance on the ignition timing. I don't know the rpm but it's probably close to 3000 at wide-open-throttle on the (oversize?) 22-10 propeller. It uses a plunger style oil pump driven from a cam on the rear gear train that creates much more pressure than I'd envisioned or hoped for. I've been backing off the oil pressure relief valve every run but still see 40/50 psi at speed. As a result one doesn't want to be wearing "Sunday finest" around this engine when running yet.
All in all, a satisfying project. It has very strong compression and starts easily from cold - 2 flips usually.
Here are few photos from along the way.
Ignition distributor ...
Carburetor ...
Cylinders ...
Crankshaft and connecting rods ...
On the stand ...
Finally - proof it does indeed run ...