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Looks great Dave. Ray

Gordon, Might can try to put shim washers under the spring to incrementally increase the spring force? I also have noticed too weak of a spring causes carb. spitting. Maybe temperature is affecting the spring force (I would hope it is not that sensitive). Still waiting on the carb. to come...

Gordon, I agree with you on poor vaporization of the fuel. Today I adjusted the gap between the pistons wider. It resulted in a 7 minute run at a slower rpm (and richer carb. setting). This rpm seems about right, it was running way too fast before. It still quit after the 7 minute run...

Hi Gordon, I know what you mean about the frustration. Been a challenge. I had a four and five minute run today, then no luck. Backfiring keeping it from running longer, it seems, not sure why. I think it may be carb. issue. Still waiting for the new carb. At least when it runs it runs...

Hi Gordon, How are things progressing? I changed things up some on my end. I went with a 1 1/2 link arm on the left, and a 1 7/16 link arm on the right. I am still using the eccentric crank pin to adjust the right piston location relative to the left piston (have a gap of around 1/16 inch...

Hi Gordon, Another thing that might cause some leakage on the far left, is when it was lapped the edges got a little more material taken off, but I do not recall measurements being that different, plus, it seems the rings are springy enough to compensate for it. I still suspect a side load on...

Hi Dave, I have thought some about using propane, but not quite ready to give up on using gasoline. Wow Dave, that Parcell and Weed engine you built is beautiful! Great job on it! My engine is starting to look like it has been through WW2. :) Thanks for the ideas. Ray

Gordon, The engine is starting to run consistent for a few minutes if I squirt heavy oil into the carb. My theory is that the oil is doing two things. 1) There is some leakage on the left piston when the piston is all the way back on the left side. The oil is helping to seal it. When the...

Hi Gordon, I agree that the carb is a big part of the problem, too much liquid fuel getting into the cylinder (not getting enough atomization). It helped some by extending the venturi to get the jet and needle closer to the low pressure area. The jet and needle really should align with the...

Hi Gordon, Hope you had a great Thanksgiving. I was able to get four 10 minute runs on the engine today on its own power. Seems to be getting better every day. Still getting plug fouling, and when it does quit it, is after hearing what sounds like some backfiring. To start the engine, it...

Hi Gordon, I believe you are right about the intake. I also have problems with plug fouling with too rich a mixture. Constantly cleaning the spark plug. Have not had much luck like I did the other day. It will turn over and occasionally run for a few seconds. I have been experimenting today...

Dsage, I have wondered about that. I have a belt from the electric motor to the flywheel of the engine. Gingery did it this way in his book, but I know what you are saying about the coupling effect. I occasionally remove the belt and try cranking the engine by turning the flywheel. A clutch...

Gordon, I ran into that problem. I had to chamfer the piston rods for cylinder clearance, and had to use a shorter set screw on the right oscillating arm. Had problems with the set screws working lose, so applied some Locktite threadlocker (blue). Thanks for the information. Ray

Gordon, I ran the engine with assistance from the electric motor for about 1 1/2 hours, hoping to get a longer run under its own power. It did not run as well today as yesterday. The max run time (on its own power) I got out of it was 1 1/2 minutes, just barely turning. Some (more than...

Dsage, I think we are making progress, but still more to do. I will be happy to share what I have learned with others once I get it working consistently. This thing has been a challenge. Ray

Gordon, Had some luck today. I adjusted as much as I could with the eccentric crank pin and used the 1 7/16 link arms. The engine actually ran on its own power. I had one 3 minute run and a couple of 2 minute runs, and several runs between 30 seconds and 1 minute. It was awesome to see it...

Gordon, I ran the engine today with the eccentric crank pin. No real success. At one point, the engine did turn over a few times under its own power. I was not able to adjust it like I wanted, because at a certain point the right oscillating arm went over center (causing the two oscillating...

Hi Gordon, Sorry to hear about your broken oscillating arm. I have broken parts too and have remade most of the parts two or three times. Encouraging that you are getting 30 psi compression. I finished all the new parts for the eccentric crank pin, and new piston rods, and started to put...

Hi Gordon, I made a test eccentric crank pin (that fit over the shortened crank pin) and spun the engine with the electric motor. The pressure at the spark plug went up from 8 psi to 12 psi, with only closing the gap between the pistons a little. I needed more of an offset to close the piston...

Gordon, I re-read your message. My concept would keep the left oscillating arm on the pin as originally designed, but the right oscillating arm would ride on an offset. If I did what you were describing about an offset shoulder in the disk (assuming I am understanding it as you described), it...