- Joined
- Mar 8, 2015
- Messages
- 311
I have built a couple of model hit/miss engines. One with a .75 bore and one with a 1.125 bore. Both of these engines used O-rings on the piston. After reading some articles on making cast iron rings, it wasn't something I felt I wanted to tackle.
I had an old Mantis two stroke tiller that finally died a few years back. I salvaged the piston from it and thought "What about building a hit/miss engine from it". It was 32 mm or. about 1.262 inches. First thing that happened was I cracked one of the rings by being careless putting it into the cylinder I created out of cast iron. To my amazement I found a set of new 32 mm rings on ebay. The crankshaft was created from several pieces I pressed and locktited together. ( 1 1/2 stroke) I put tapered pins on either side of the rod journal. The rod bearing is a 12 mm ball bearing. The wrist pin in the piston was 8 mm which was close enough to use a standard 5/16 bronze bushing.
The flywheels were made from a couple of cast iron trolley wheels I found at an antique engine show in Ft. Meade, Fla.
Monday, I finally got it running. Unfortunately the Chinese ignition module keeps killing my Hall sensor. I just ordered 10 Hall sensors from a different seller. I am hoping that I just got a bad batch. My other two engines use similar modules and I haven't had these kind of problems.
Once I resolve my ignition problems, I plan to clean things up and mount the ignition system and battery underneath.
I had an old Mantis two stroke tiller that finally died a few years back. I salvaged the piston from it and thought "What about building a hit/miss engine from it". It was 32 mm or. about 1.262 inches. First thing that happened was I cracked one of the rings by being careless putting it into the cylinder I created out of cast iron. To my amazement I found a set of new 32 mm rings on ebay. The crankshaft was created from several pieces I pressed and locktited together. ( 1 1/2 stroke) I put tapered pins on either side of the rod journal. The rod bearing is a 12 mm ball bearing. The wrist pin in the piston was 8 mm which was close enough to use a standard 5/16 bronze bushing.
The flywheels were made from a couple of cast iron trolley wheels I found at an antique engine show in Ft. Meade, Fla.
Monday, I finally got it running. Unfortunately the Chinese ignition module keeps killing my Hall sensor. I just ordered 10 Hall sensors from a different seller. I am hoping that I just got a bad batch. My other two engines use similar modules and I haven't had these kind of problems.
Once I resolve my ignition problems, I plan to clean things up and mount the ignition system and battery underneath.
Last edited:
