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I have found that my Module 1 cutters get the most use and are usually less expensive. Ray

Thank you Minh but this build has me really thinking and planing. I cutout the connecting rod today. Right off the CNC machine. This sucker is over 9" long. I wonder if it will be strong enough for this engine. Connecting rod with wrist pin ball bearing and 1.25 piston. Well so far my...

It not only seals the water jacket but I have never had a combustion gas leak either. Here it is after decking the cylinder. Thanks for looking Ray

I thought I had a cast iron rod large enough to make the liner from but I was wrong. I did have a piece of steel rod that will work just fine. Turned down to size with a larger lip on one end to fit a groove in the cylinder. Cut off the waste in the band saw and faced the end to length. Using...

I think these are made of some mystery metal that was added for filler. I may just not use them anymore they are just not worth it. Now another cavity cut 2 1/2" deep. These aren't really that bad to do but there is a lot of handle turning and swarf to contend with. The finished product...

Well thank you Sparky that is very kind to say. I don't have a fire place or a burn barrel but I understand they have to be heated and then left in the ashes to cool slowly. Just how hot do they have to get? Today The cylinder block was cut to size and trued up all sides. Over to the lathe...

Drilling the holes for the main bearings. And finishing to size with a boring head. I made a brass spacer to go between the bearing race and the crankshaft on each side to lock the crank in place. (Sorry but you can't see them in this Picture) (No not this picture either) Maybe I...

I don't know but it sure was hard to machine. I made a bunch of chips and I got rid of anything that didn't look like an engine base. No end mills were harmed in this operation. I really like the idea of a one piece engine base. I may use this style more often. I also cut out and installed...

Richard it seems to be a hit miss if you get one that will mill half way decent these were not good. This aluminum is what is left over from my 6 cyl build. It was too large in all dims so over to the band saw. First a 1 1/2" wide slice over the width. Then two cuts to remove the angled...

I had started this crankshaft a couple of days ago. It has a 3" stroke. It is assembled on a 12mm shaft with a loose fit and Loc-Tite 620. I used the lathe to hold everything in line over night. This is after I installed tapered pins and cut out the middle section of the rod. The shiny...

I know the title is kind of vague but I really haven't made up my mind yet. I was thinking of a side shaft Hit Miss engine, or an overhead cam Hit miss engine , or a marriage of the two so I will just start and see what happens. I haven't had a lot of shop time with 2 hurricanes and the...

Thanks K2 but the change was do to me turning on the air compressor for more air pressure. Thanks Minh and Brad for the comments. Ray

The last few days I decided to make Model #2 and it is much smaller than Model #1. All the parts are made just like the larger model just smaller which has changed the stroke now to 11/16" instead of 1". The original pistons were turned down for the smaller bore. No flywheels this time...

I have used that module on several of my models but not from aliexpress. That price is for a new customer and since I have bought from aliexpress before the price is some higher but still very good. The module and the 1/4-32 spark plug together usually sell for over $50 elsewhere. Ray

I came to the same conclusion Brad and am waiting on some drill rod to arrive. I'm not going to rush through it this time and try to get a closer fit. Ray

I originally miss read your statement sorry. I have tried tightening the pivot joint screws to the point of making the joints immobile. It has made no difference. I think the distance my pistons are retracted is too close to the outer end of the cylinder allowing them to bind. I am planning...

See post #8 Ray

First an update on the project over the last few days. The next two pictures show how the end plates and the cylinders are assembled. The brass nipples are where the air supply is attached and for the exhaust air. A close up view of the end plates front and back. Using a surface plate and...

Progress on this build has slowed considerably because of other jobs that had to be done but I was able to get a couple of items made. I made the air slots in a separate piece of aluminum that will ride on the end of the cylinders They will have 3 coil springs between the plate and the steel...

I reamed the cylinder holes with a 0.001 oversize reamer and that did the trick. It now turns free and smooth and I don't think the extra clearance will hurt me. As I said before this is just a test stand and not the final product but I kind of like the steel angle iron supports so I thought I...