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You have to measure several places along the length of the cylinder, if the dimensions are close together it should be fine. Can you take a picture of the inside surface of the cylinder ?

Just .. think and adjust it in the simplest way. And the engine will run.

For those who are trying to focus on finding a solution to a problem, ... sometimes it has the opposite effect.

Casting: Just a small part of machining. Don't be prescriptive.. , don't make it special... Let people play the way they like and want .

That started from your comment : Moreover, a long time ago ,I asked you about your plans, I just asked to know....because if I buy it, I have to downsize it - a huge work - the way I want because your design is very big compared to what I need for a model engine. or for someone who likes it...

I don't see any problem, it's his choice and right and should be respected. Some people don't even share a plan....but are still considered "gods". ;)😂

Welcome ! Glad to have you join .

Hi @Danuzzo I used the steel grades I had on hand for the cylinder Piston: aluminum 6061, 7075, brass, cast iron If I use cast iron rings, I don't worry too much about the inner diameter of the cylinder, if I use O-rings, I have to bring the inner diameter of the cylinder to the outer size of...

@L98fiero , @timo_gross ! Your comments make me more confident, thanks ! Thanks you ! 👍👍👍

I won't argue, I always tune the engine model the way it will run and it runs - that's all I need !

As @Jasonb said !! And this is a model engine, it will never achieve what is in the full size engine, so don't compare.

@Danuzzo ! What are your plans for the piston? with rings, without rings, cast iron rings or O-ring??

Hi @timo_gross 32 , 31.5 and 31 degrees for this project of mine : https://www.homemodelenginemachinist.com/threads/mastiff-lc-mason-engine-redo.35732/post-417901 And https://www.homemodelenginemachinist.com/threads/my-new-project-small-diesel-engine.35441/post-400737

That is when the exhaust pressure in the cylinder is still quite large and it will affect the intake stroke. When you build an engine with a compression ratio of 4-1, 5-1 or 6-1 the entire cylinder volume is calculated and when you give it 45 degrees after BDC, what will be the remaining...

I already know that, I know standard module 0.3....0.6, 0.7.... I want to know if using "non-standard" module like 0.635 is ok?!

Hi All ! I tested cutting gear 35 , and also tested with the cutter that I sharpened The final result ( 3 ) looks pretty good

Hi All ! Need advice ! I am drawing gears for crankshaft and camshaft I am planning to change from DP to module 40 DP 70 teeth --> module 0,635 7o teeth . What do you think ??

An other way : Fix the 2 lobes on the shaft at an angle of 102 degrees, then adjust the position of the gear.

Aluminum, steel, steel grade ......for cylinder.., Piston without ring, with CI or O ring.. But there is only : make the best cylinder possible. For me, cylinder is the most important part. Luck is not in this "game", But still wish you luck and please update !!

Hi @Danuzzo . " I just want it to run well, with durability not being a significant factor, but some durability is desired." My experience : Work with whatever steel I have on hand for the cylinder , pistons made of aluminum or cast iron , I have made cylinders with welded steel tubes and they...