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Yes bronze would have been a longer lasting material but I have 14 other model engines that I built with brass guides that are still going strong. Thanks for the comment. Ray

I made 8 brass valve guides, these are longer than usual for me. I am planing an overhead cam for this engine and I noticed that on the other engines I had built with overhead cams the valve stems were subjected to some side loads. Making the guides longer should give the valve stems more...

I cut the cooling fins in the head today and drilled holes for the intake and exhaust ports. Then gave it a little shine. I think I am done making holes in the head for now. Thanks for looking Ray

Cylinder head day. Time to see if my calculations are correct. First spot drill the hole locations. Then on the drill press finish drilling through for the head bolts, intake, and exhaust holes. Counter drill for the head bolt recesses and partially drill for the spark plug. The spark plug...

Been working on the pistons the last couple of days. This shows cutting the o-ring groove in the piston. And a group photo. Slotting the piston for the connecting rod. Drilling for the wrist pin. Ready for the connecting rods. I installed brass bushings in the piston end of the...

This is Royal Blue from Ace hardware. Ray

I did a little more machining to thin the web, cut off 4 pieces and milled to equal width. Did a polish job and installed on the engine block. This engine has a solid foundation. Thanks for looking. Ray

Nerd 1000, Blue Jets, and Minh Thank you all for the interesting comments and I do take them seriously and objectively but for now I will stay with two main bearings. The crank looks so nice and shiny that I decided to paint the engine block. I have this triangular piece of aluminum left...

Spent the day working on the connecting rods. First was drill the holes for the rod bolts. Then cut the ends off and tap the threads. The needle bearings I am using have a rather thin shell so not to squeeze them too tightly with the rod caps I used an expandable reamer and an extra...

I thought about it before I milled out the center section of the block but decided against it. The compression ratio will be 6 to 1 with a 1" stroke and don't expect the rpms to exceed more than 2500. I like slow running engines. If it proves necessary I can cut the crank in half and add...

I muddled over how to line bore the main bearing caps for some time with the equipment and tooling I had and finally decided on this setup. I know it looks sketchy but it was quite stable and at at 65 rpms it worked fine. My 3/4" drill bit was just long enough to reach through both ends...

Thanks Ken I will keep that in mind. I fully intended to document the assembly of the crankshaft but in the heat of things I completely forgot. Clocking the sections was not a problem even when the outer two sections were added and the center rod was removed. These sections do not have a...

This is a chain drive engine I built in 2020. It was originally a gear drive. Ray

The center rod in the picture is 8mm and is a close sliding fit through the sections. Great care will be taken to drill the offset throw holes as straight through each section as possible. Even a few thousands off will cause many problems. The rod journals will be made from 9mm drill rod with...

The kitchen remodel project is winding down and I have gotten some time to work in the shop again. I will try to build a crankshaft with needle bearings on the connecting rod journals. To do this I can't use any type of sealant on the crank assembly like LocTite as it may migrate into the...

Got some more done on the engine starting with the cast iron cylinder liners. Two of the chunks in the back make 4 liners. After clamping the liners overnight for the sealing to cure I decked the engine block. I opened up both sides of the block to get some rod clearance but I didn't have to...

I was able to get some time over the last few days from my (she who must be obeyed) remodeling job to make a big mess and a cavity. Most of the scarf is in the waste bin already. Thanks for looking Ray

I understand now thank you for asking. I make it up as I go along. Sometimes that's good and sometimes I have to start over but always the engine runs in the end. Ray

I am not sure I understand your question gbritnell. I have seen round crankshafts pressed together and then drilled and locked in place. Rotax comes to mind. Bored out the 4 cylinders for the cast iron liners. I have been corralled by the wife to remodel our kitchen and dining room...

I am working on a round design like a press together motorcycle type but that's still to be determined. Ray