Machining 2 stroke combustion chamber from round stock, compression ratio squish turning head lathe

[@alerusso5356]

Grande, sempre un piacere vedere gli sviluppi sul tuo motore sei davvero bravo🤗

[@tallergreidy]

Excelente trabajo

[@janeali1174]

Sir i have two stroke cylinder i want to increase its rpm power please help me how i can increase the speed from its ports. Please help me tell me sir

[@einhase6924]

Lower compression head, higher(atleast 190 deegres) and wider exhaust port maybe ad auxiliary ports, set transfer ports to 130 deegres of timing. Most important: make a matching exhaust.

[@tallergreidy]

Excelente trabajo

[@machiningandtuning]

Glad you enjoy the process, thanks for watching 👍🏻

[@marcusbrown2493]

You would be better making a radius cutter (easy enough( to get a more accurate combustion chamber volume and avoid chatter, also for the squish band to follow the piston dome. This is how I did it before I went CNC

[@machiningandtuning]

Yes i think i'll make one in the future, can become handy. For this type of work the methods i use work very well for me. The little chatters is not a big deal because i'll clean anyway with some emery paper. For the volume also the radius cutter is not really helpful in my case because i don't make maths to calculate the volume, but i measure directly few times in between, and with max 2-3 measurements i reach the desired volume, considering also that almost every head that i machine isn't with a full radius. For the piston dome, yes, using a radius cutter is the way to go. Thanks for your thoughts ;)

[@marcusbrown2493]

@@machiningandtuning I can send you a picture of one I made if it helps

[@Sketch1994]

All heads I did so far, I did them with just 2 form tools (plus a facing tool and an ER16 grooving tool to form the O-Ring gland if required), and it worked a lot better than trying to blend a radius between 2 other cuts with a radius cutter. The finishing pass is one move with the compound to set the depth and the angle where the combustion chamber meets the squish band, and then an inward move with the cross slide. You can either face it all the way to the spark plug hole, or leave a protruding spark plug with a small radius around it, for a toroidal shape combustion chamber. If 2 conical surfaces are required I would generally try to get at least one of them from the tool itself, but then the hardest part is to find the proper reference points for measuring while still on the machine, but you can easily get a twin chamber head within 0.1mL of each other just by eyeballing a set of calipers over the features you are machining). Of course my method works better on my 2 ton TOS SN50 (a real monster of a machine, an absolute joy to work on and impressively precise for a 37yo machine, which more than justifies the fact that it's still being produced), but you can break up chatter even in small machines by picking around the shape in different directions, and if I couldn't use a form tool at all, I would rather use a freehand tool rather than a radius cutter for combustion chambers (I have modified combustion chambers even by just holding a freshly faced head with just the squish machined on it on a drill press, and using a hand turning tool with the table as a tool rest, to freehand turn the dome and then blend and polish it with emery, and got some really fantastic results).

[@marcusbrown2493]

@@Sketch1994 sorry don't agree with you there but whatever works for you, far more flexibility with a radius cutter and even more with cad cam cnc, have a look at my KZbin channel shorts

[@Sketch1994]

@@marcusbrown2493 A CNC is almost always the most universal in terms of what you can do with the least amount of tooling, but when it comes to having just a manual lathe, and having to turn a dome in a pinch every now an then, I can grind a form tool from a carbon steel planer blade within less than 20 minutes, and it can machine multiple radii and ellipses, blends and angles at once. A single pivot style radius cutter attachment will only work well for cutting a spherical segment, often smaller than a hemisphere when in bore (which is indeed a decent design in some cases), depending on the size and shape of the toolholder, Many, if not most modern, combustion chambers aren't hemispherical anymore and they have either a radius or an elliptical shape, blending a cone with a face around the spark plug (the small part right out of the squish zone is practically just a taper, then there is a blending radius that gets larger as it gets closer to the center of the combustion chamber) PS: Nice work BTW. Most machine shops just nag and refuse to install aluminum sleeves and send them for plating...