220 Ohms
8th November 2010, 17:03
I need some ideas on the best solution to a problem and possible good places to get it done.
Background:
I have been modifying an old scooter engine to accept a 2 speed auto transmission from a related model. All has gone well (and cheap) so far with only minimal engineering required, I finally get to the point of bolting on the sidecover for the last time and find it doesn't meet the crankcase mating surface anymore.
Due to a slight difference in the donor models used the thread on the crankshaft is
hitting the shoulder of the bearing seated in the sidecover and is stopping it from fitting correctly by about 4mm.
So far I can see 3 options
1. Bore the bearing seat deeper allowing the standard bearing to sit deeper in the side cover therefore avoiding the thread while still supporting the end of the shaft.
- Spoke with an engineer here in Wellington, could be costly ($400+) due to the setup required to machine it accurately but is the simplest idea.
2. Source a shorter bearing
- Haven't found any in the size required or similar sizes
3. Space the side cover out
- I have a number of spare sidecovers that could be used to make a spacer but that also requires machining and would affect the other 3 shafts which currently seat fine in the cover
I'm inclined to go with option 1 but need to keep the cost down as the whole project has only cost about $300 to date.
Any ideas or recommendations are welcome :)
Background:
I have been modifying an old scooter engine to accept a 2 speed auto transmission from a related model. All has gone well (and cheap) so far with only minimal engineering required, I finally get to the point of bolting on the sidecover for the last time and find it doesn't meet the crankcase mating surface anymore.
Due to a slight difference in the donor models used the thread on the crankshaft is
hitting the shoulder of the bearing seated in the sidecover and is stopping it from fitting correctly by about 4mm.
So far I can see 3 options
1. Bore the bearing seat deeper allowing the standard bearing to sit deeper in the side cover therefore avoiding the thread while still supporting the end of the shaft.
- Spoke with an engineer here in Wellington, could be costly ($400+) due to the setup required to machine it accurately but is the simplest idea.
2. Source a shorter bearing
- Haven't found any in the size required or similar sizes
3. Space the side cover out
- I have a number of spare sidecovers that could be used to make a spacer but that also requires machining and would affect the other 3 shafts which currently seat fine in the cover
I'm inclined to go with option 1 but need to keep the cost down as the whole project has only cost about $300 to date.
Any ideas or recommendations are welcome :)