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| I feel a project coming on, maybe too daft? |
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| John Hill:
I feel a project coming on but the idea may be too daft to be practical. Can I make a very slow reving internal combustion engine? The idea is to make a two cylinder direct drive motorised bicycle! :bugeye: There will be one cylinder each side of the rear wheel with a crank on the ends of a 'live' axle. The cylinders will oscilate with the piston rod coming through a sealing gland like on a double acting steam engine, the 'lower' side of the piston will be the induction chamber for a two stroke with the combustion chamber being at the 'top' of the cylinder. Obviously the engine has to be very low revving, something like 100 rpm flat out! I need ideas how to make an engine that will do that, long stroke I presume, maybe a seperate combustion space like on the semi-diesel marine and tractor engines? Any ideas for a slow revving internal combustion engine? :coffee: P.S. Obviously this is a novelty machine so please dont fret about road legality etc etc. |
| BillTodd:
Doug's Museum of Retrotech my provide inspiration : http://www.douglas-self.com/MUSEUM/museum.htm Your separate combustion chamber is a good idea, but may only work well if you have some kind of fuel injection. A long stroke 2-stoke will probably require some kind of deflector piston if cylinder ported, but I wonder if it is possible to arrange to have the scavenge blast shot up from the centre of the piston? (your fixed con-rod may help) Or.How about something wild ? Have the combustion chamber at the 'bottom' and use the con-rod to control the scavenge (making the cylinder uni-flow) making the engine pull on the con-rod :) Bill |
| Fergus OMore:
BSA produced a Winged Wheel in 1953. I believe it had a single pot! Worth looking at- tho' it wasn't a raving success. The French- eh, bien , mon ami had the cyclomoteur. Ah, las bas! but every little creep of 14 or whatever, bombed around with gay( not that sort) abandon. The NSU had the 50cc Quickly which was quite refined. I rather think that a friend has still got one- in her cellar. So good luck. |
| Bluechip:
Here you are John. Vincent Firefly. If you wander down the link there is one in NZ apparently ... Track it down and make a sharp offer ... http://cyclemaster.wordpress.com/page-14-vincent-firefly/ I'm not sure why it was called 'Firefly'. The example I knew was incapable of either ... BC |
| Fergus OMore:
Firefly as in Fairey Firefly, Comet as DH Comet- which was 1949- Farnborough, DH Rapide was the Dominie-Rapide and Vincent himself was ex-Royal Flying Corps. The Firefly was slow as well. |
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