Monty Balancer Shaft Bearings
- Thread starter Gbarnes3
- Start date
Gbarnes3 said:
I'd throw the damn thing away as Clem suggested but for an answer, you generally find that Laverda used "C" designated bearings throughout the complete engine.
In practice and for that application I'd use a standard bearing which is a tighter clearance bearing then the loose "C" bearing
B
bob
Guest
Geoff, it's worth trying the engine without the shaft - some of them vibrate more than others and you might find you don't notice any increase in vibration. I binned the balancer on my Atlas race engine [which was a big double ended affair similar to a Zane 668] and it didn't cause any problems. Balancers are more relevant if you tend to cruise at steady speeds, something few Montys ever do nowadays!
If you decide you want to stick with the balancer there was an upgraded bearing the factory used on the racers. I've tried to find a reference for it but I can't find where I stored the info. A decent bearing specialist might be able to help you out. If you're messing about on that side of the motor consider converting the LH mains to roller instead of ball bearings. It's a drop-in conversion and well worth doing.
Bob
If you decide you want to stick with the balancer there was an upgraded bearing the factory used on the racers. I've tried to find a reference for it but I can't find where I stored the info. A decent bearing specialist might be able to help you out. If you're messing about on that side of the motor consider converting the LH mains to roller instead of ball bearings. It's a drop-in conversion and well worth doing.
Bob
B
bob
Guest
Glenn,
I've done that much to the motor I honestly can't remember what I did, the clearance I used would have been the same as the standard ball bearing,whatever that is. I haven't got a manual handy so I can't check...
Trawling through my notes I did manage to unearth the uprated spec of the balancer shaft bearing; 2 x RIV SKF NJ 202 ECP
( 15x35x10 mm)
I've done that much to the motor I honestly can't remember what I did, the clearance I used would have been the same as the standard ball bearing,whatever that is. I haven't got a manual handy so I can't check...
Trawling through my notes I did manage to unearth the uprated spec of the balancer shaft bearing; 2 x RIV SKF NJ 202 ECP
( 15x35x10 mm)
Glenn,
The factory used C3 bearings almost universally throughout their engines... not entirely necessary for a road engine but I'd stick with them for a racer. Less friction has a lot going for it and in racing applications mechanical quietness is quite irrelevant!
The early balancer does only a half-hearted job of cancelling out the rocking couple inherant with a 180? twin and is prone to failure at extended high revs, the Atlas and later Zane engines have a far better arrangement that apparently can be omitted without running into trouble.
piet
The factory used C3 bearings almost universally throughout their engines... not entirely necessary for a road engine but I'd stick with them for a racer. Less friction has a lot going for it and in racing applications mechanical quietness is quite irrelevant!
The early balancer does only a half-hearted job of cancelling out the rocking couple inherant with a 180? twin and is prone to failure at extended high revs, the Atlas and later Zane engines have a far better arrangement that apparently can be omitted without running into trouble.
piet