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Johan, I am a little late to this thread, but as a suggestion, why not try propane fuel. Clean, almost odorless, and much less troublesome once set up properly. With gaseous fuel, carb size is not a big problem as you don't have to worry about the venturi size needed for good fuel atomization...

Gary, We were wondering where you were. Sorry you couldn't make it. Hopefully we will all see each other next year. Jeff

This is my latest gas engine build. It is a 1/10th scale International Harvester Co. Titan 50 hp stationary engine from the 1911-1916 era. This project was another collaboration with model builder and friend Doug Kelley. The original Titan 50 hp stationary engine was a 9” bore x 14” stroke...

The water rinsing solution after brazing is not important. Any water is suitable. You are just rinsing off the acid pickle solution. Besides, a pickled brazed surface will generally see further cleaning a few more times prior to final finish, polish, or paint. I also don't think soft water would...

Hi, For those hesitant to do much hard silver soldering (brazing) there is a magazine currently in the Barnes & Noble craft magazine section entitled "Everyone's Guide to How to Solder Jewelry" $14.99. I spent an hour reading it and found a lot of good information even though I have done a fair...

John, I assume you have had some experience with the Lehr carburetor. I don't know much about them, but it sounds like a pretty large carb. I have had some good experience with propane using Jerry Howell's two jet carburetor. It was designed to handle the Hodgson 9 cylinder radial and should...

Aluminum and brass are two tough base metals for good durable model paint finishes that don't chip or peal. I have tried a lot of paints and I have had the best results with the industrial baking finishes like Gun Kote (KG Industriesl). The extra effort is well worth it. It doesn't chip, peal...

The busy holiday weekend may actually be a plus for attendance to the museum and show. I have never visited the APM. However, it coincides this year with a planned trip to VT. We will only be 1.5 hrs away. So I am planning to visit the museum and show this year, but you all have me thinking of...

Mauro, I still recommend you tackle the low compression issue before looking for other problems. It is very important to an easy starting and good running engine. I read the FAME site posts on the Upshur Twin as rklopp suggested because I was very interested in building this engine a while...

Brian, I have 5 of the S/S CDI ignitions in single cylinder, multi cylinder distributor, wasted spark, and buzz coil applications. All have worked very well. I use 4 AA batteries on all of them. Battery life is great if you like to run your engines a lot. Don't be afraid to experiment with plug...

I usually overlook something in my rush to hear that first pop. When nothing happens, I then settle down and go over the basics. If you know you have compression problems you may as well fix them now. I know you didn’t want to hear that. Compression will improve after the engine runs for a few...

I have a 3/4 hp 1925 Briggs and Stratton model FH throttle governed engine that uses an atmospheric intake valve. It was designed to operate at 1200-1800 RPM. It will, however, run much faster and develop power. It obviously is not the right intake valve mechanism for high output high speed...

John, I have larger engines that do the same thing. A larger oiler helped on one of them. For a model engine you can try a thinner weight oil. Thinner oils should exhibit less surface tension. You don't need a heavy weight cylinder oil, and you don't need a lot of oil. However, if the viewing...

Interesting thread! I have two model engines running propane and I consider it the perfect fuel for many types of model engines. To address some of Brians questions, the orfice plate in the carb intake is to get a good vacuum signal at the carb fuel inlet which is needed to get flow from the...

Gus, As of late yesterday afternoon, Roy is still busy with his website as Gail had said. I suggest that you call him if you want to order something you need soon. Jeff

Many, many decades ago Zenith cast iron carburetors were factory painted with lacquer. It seemed to hold up well to gasoline. Shellac should also hold up well also since it is only soluble in alcohol. Jeff

Thanks Johan. That pretty much confirms what I had decided to use as a starting point. I have a bit more work to do before it is finished. Jeff

Chipenter Thanks, but I would not think a wick would last long with the reciprocating motion of the piston in the cylinder. Contact would be intermittent and, I think it would be chewed up in short order. I am familiar with oil cup wick oilers for bearings, and they seen to work well. Jeff

A gravity system is a lost lube system with a small oil reservoir an inch or to above the cylinder. Oil drains by gravity thru tubing to a vented hole in the top of the cylinder just as the drip systems do in old hit & miss engines. In this case, I find that a .040" ID tube will yield about 1...

I have a horizontal 1" bore x 1.4" stroke open crankshaft engine that will use drip or gravity flow to lubricate the cylinder. The engine is throttle governed and normal speed should be 400-600 RPM. It won't be doing much work. Fuel will probably be propane. My question is how can an adequate...