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| vintageandclassicrepairs:
Hi, You will need to incorporate a 2;1 reduction as the drive from the camshaft was at 1/2 the crankshaft speed So moving the drive disc across the the other side will work, but it will be twice the speed it was with the old engine :Doh: "Neracar" 2 wheelers from the 1920's used a similar drive with the drive roller running against the engine flywheel !!!!! I use "kevlar" belts on my ride on mower, much less prone to wear /slippage, I dont believe belts stretch much they wear on the sides and sink further into the pulleys ??? John |
| Brass_Machine:
--- Quote from: seadog on October 26, 2016, 03:27:31 PM ---What about turning the drive hub around on the shaft? It would mean relocating the actuating fork though. Is that feasible do you think? --- End quote --- That was my initial thought and perhaps the easiest fix. Problem is, there is stuff in the way and I would not get full movement (so not all the forward speeds) plus the drive pulley spins at 1/2 RPM... spinning it directly off crank would double all the speeds. Eric |
| Brass_Machine:
So, I am searching for gears. Having the worst time. I cannot find keyed gears that have the same pitch angle for both 1/2" and 3/4" shafts. the crank shat is 3/4" while the pulley that drives the wheels (originally off the cam) is only 1/2". The only thing I have found so far is some gears that can be bored. No keyway though... Which is fine for the 1/2 drive shaft, I need a keyway for the 3/4 shaft. Hmmmm |
| awemawson:
Come on Eric, we're mad modders, you can slot a key way on your lathe, or if your lathe is too skimpy for that, I'm certain one of our fellow members can do it for you. |
| RussellT:
--- Quote from: Brass_Machine on October 26, 2016, 10:04:24 AM ---If I adjust the drive wheel so it contacts the other side. I will get 1st and 2nd plus 1 reverse speed.Unfortunately, it cannot go any further left due to things being in the way. --- End quote --- I think I would give this a try first. As this is a continuously variable transmission 1st, 2nd etc are just positions so by holding the gear lever in position 1/2, 1, 1 1/2 and 2 should give you 4 speeds. Because the disc is running at double speed they should be equivalent to 1,2,3 and 4. It may not work because the higher disc speed may cause slipping but I would have thought it was worth a try. Russell |
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