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| rleete:
I'm starting on plans for a small horizontal mill engine. Double acting, single cylinder with a spool type valve. I'd like it to tick over nice and slowly. Something that runs on just a few PSI. Obviously, good fits are critical for reduced friction, and a large (somewhat oversized?) flywheel will help. My question is, what is better for a slow running engine? Long or short stroke, large or narrow bore? Is is a ratio? I'd like to keep the bore down under 1", if that helps. |
| Darren:
I believe low RPM like a long stroke, nice long burn to make it efficient.... What do ya mean you want steam.... :lol: |
| Bernd:
Roger, I'd think about incorporating ball bearings in the moving parts. Just for a challenge of course. :) I also think long stroke and large bore. Think of the big diesel engines that run at low rpm. Bernd |
| rleete:
Darren, is there any rule of thumb on that? i.e. is "long stroke" double the bore? Tripple? More? Bernd, already planned on bearings, just because i happen to have some I rescued from the scrap bin. |
| John Hill:
I do not know if low RPM likes a long stroke but it is certainly true that high RPM calls for a short stroke! Everyday internal combustion engines for cars etc became 'square' (stroke=bore) about 60 years ago most nowadays would be stroke less than bore (I think) however I recently read that stationery steam engines were typically stroke=bore x 3. |
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