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I am considering building a Hit and Miss engine of my own design. A few starting questions: What is a good Bore to Stroke Ratio? What is a good Connecting rod to Stroke Ratio? I would be using 5.5" Flywheel diameter.

What video formats are supported by the site? I tried MP4 with no luck.

John, I do not have a check valve in the fuel line. I do see the fuel level drop slightly in the tube between hits. I am very new at the hobby but it appears to me the fuel level in the line is controlled by the fuel tank height in relation to the air inlet. The plan says the fuel level...

Inches

I used plans from the book: " The Shop Wisdom of Philip Duclos" The book has numerous plans for other engines.

I just got my new Odds and Ends engine to run. Still need to do some tweaking to timing and setting governor springs. I use a set of points from NAPA. This is only the second from scratch engine I have built. I have only had my LMS Mill and Lathe for a little over a year. Most of the...

I also purchased a Grizzly 6 in rotary table. The quality is bad at best. I had to take it apart clean it, lube it, and try to adjust it. It got slightly better.

Follow-up question: From all I have been checking on the engine I think it is a carb issue. What would be a good venture size vs. the inlet size?

Thanks for all of the suggestions. I will do some more troubleshooting and get back with results.

Thanks for suggetions

I am very new to engine building. I just finished an Upsur vertical pump engine ( my first IC engine), I have been trying to get it to run to no avail. It will start and run for about 20 seconds and die. I tried it on both gas and Coleman fuel no change. I tried using vapor carb and a fuel...