who is going to put one of these on 6mm cylinder studded engine?!!
http://www.1977mopeds.com/universal-water-cooled-head-puch-tomos-derbi-p/7165.htm
http://www.1977mopeds.com/universal-water-cooled-head-puch-tomos-derbi-p/7165.htm
They offer them in 40mm and 47mm as well as 43mm and 45mm. What would you use for a water pump, and how much radiator would you need?we've got a 47mm bore, nothing a little bit of sandpaper glued to a piston can't fix though. may not even be an issue depending on how far up your piston comes. if it fits a puch cylinder it'll fit our cylinders.
HeadSmess did something similar, though I believe he custom made his. I think he found that it was a pain in the ass and generally not worth it.
Actually something I'd be relatively interested in, I wanted to put a large tank (suzuki motorcycle/older motocross type) on my bike again, I think some problems I had were due to this large tank trapping heat around my head and made some overheating related problems.darn tootin it was a pain in the arse!
nah, it just needed to make it to MKII, or version 1.0.2 or something...
basically i didnt give much thought to the idea, just made it... now, if i had sat down and seriously contemplated how to get the thermosiphon to work properly, and had oriented the inlet/outlet and radiator to do so...it would have worked
one, inlet as low as possible. 2, outlet as high as possible. 3, head has to be basically level with center of radiator, and as short and straight a run with hoses as possible. no sharp bends and no loops etc.
"polarised" isnt really the word, but the head simply needs to be plumbed so the water can flow the correct way. ^^^up^^^, as hot (less dense) water rises. no pockets, no air/water traps, just as smooth and unrestricted a flow as possible.
completely pointless, but it would have worked!
the 120mm PC radiator was adequate.
being unpressurised does limit heat transfer to an extent, and there has to be allowance for water expansion upon heating as well.
coincidentally, only just the other night i suddenly realised why the pump i had made didnt work! should have made it from plastic or something nonconductive rather than metal/alloy. eddy currents! so bleedingly obvious now...
only advantage of water cooling is when you are stuck at traffic lights on a hot day with an engine prone to overheating... and you can make multi cylinder engines smaller because you dont need fins in between. oh, and they tend to run that tiny little bit quieter. slightly more efficient with multiple cylinders as they can all have the correct mixture rather than running the center pair slightly rich...
anyone interested in buying build 1.0.2 if i make it? will include radiator and all your choice of combustion chamber volume/design, whatever!